<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:70d5e372-a0dd-40e3-8c1b-60c4ffea8676,g:b64f4f95-25ef-4278-9d64-4319dd0300f7-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:spxc="http://www.spx.com/20241231" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types1="http://www.xbrl.org/dtr/type/2020-01-21" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2022-03-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.spx.com/20241231">
  <xs:import namespace="http://fasb.org/srt/2024" schemaLocation="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2024" schemaLocation="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2022-03-31" schemaLocation="https://www.xbrl.org/dtr/type/2022-03-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2024" schemaLocation="https://xbrl.sec.gov/country/2024/country-2024.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/cyd-af-sub/2024" schemaLocation="https://xbrl.sec.gov/cyd/2024/cyd-af-sub-2024.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2024" schemaLocation="https://xbrl.sec.gov/dei/2024/dei-2024.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2024" schemaLocation="https://xbrl.sec.gov/ecd/2024/ecd-2024.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="spxc-20241231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="spxc-20241231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="spxc-20241231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="spxc-20241231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="CoverPage" roleURI="http://www.spx.com/role/CoverPage">
        <link:definition>0000001 - Document - Cover Page</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AuditInformation" roleURI="http://www.spx.com/role/AuditInformation">
        <link:definition>0000002 - Document - Audit Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofOperations" roleURI="http://www.spx.com/role/ConsolidatedStatementsofOperations">
        <link:definition>9952151 - Statement - Consolidated Statements of Operations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofComprehensiveIncomeLoss" roleURI="http://www.spx.com/role/ConsolidatedStatementsofComprehensiveIncomeLoss">
        <link:definition>9952152 - Statement - Consolidated Statements of Comprehensive Income (Loss)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofComprehensiveIncomeLossParenthetical" roleURI="http://www.spx.com/role/ConsolidatedStatementsofComprehensiveIncomeLossParenthetical">
        <link:definition>9952153 - Statement - Consolidated Statements of Comprehensive Income (Loss) (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheets" roleURI="http://www.spx.com/role/ConsolidatedBalanceSheets">
        <link:definition>9952154 - Statement - Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheetsParenthetical" roleURI="http://www.spx.com/role/ConsolidatedBalanceSheetsParenthetical">
        <link:definition>9952155 - Statement - Consolidated Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofShareholdersEquity" roleURI="http://www.spx.com/role/ConsolidatedStatementsofShareholdersEquity">
        <link:definition>9952156 - Statement - Consolidated Statements of Shareholders' Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofCashFlows" roleURI="http://www.spx.com/role/ConsolidatedStatementsofCashFlows">
        <link:definition>9952157 - Statement - Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofCashFlowsParenthetical" roleURI="http://www.spx.com/role/ConsolidatedStatementsofCashFlowsParenthetical">
        <link:definition>9952158 - Statement - Consolidated Statements of Cash Flows (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentationandSummaryofSignificantAccountingPolicies" roleURI="http://www.spx.com/role/BasisofPresentationandSummaryofSignificantAccountingPolicies">
        <link:definition>9952159 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="UseofEstimates" roleURI="http://www.spx.com/role/UseofEstimates">
        <link:definition>9952160 - Disclosure - Use of Estimates</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NewAccountingPronouncements" roleURI="http://www.spx.com/role/NewAccountingPronouncements">
        <link:definition>9952161 - Disclosure - New Accounting Pronouncements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSale" roleURI="http://www.spx.com/role/AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSale">
        <link:definition>9952162 - Disclosure - Acquisitions, Discontinued Operations, and the Asbestos Portfolio Sale</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuesfromContracts" roleURI="http://www.spx.com/role/RevenuesfromContracts">
        <link:definition>9952163 - Disclosure - Revenues from Contracts</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Leases" roleURI="http://www.spx.com/role/Leases">
        <link:definition>9952164 - Disclosure - Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InformationonReportableSegments" roleURI="http://www.spx.com/role/InformationonReportableSegments">
        <link:definition>9952165 - Disclosure - Information on Reportable Segments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SpecialChargesNet" roleURI="http://www.spx.com/role/SpecialChargesNet">
        <link:definition>9952166 - Disclosure - Special Charges, Net</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesNet" roleURI="http://www.spx.com/role/InventoriesNet">
        <link:definition>9952167 - Disclosure - Inventories, Net</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandOtherIntangibleAssets" roleURI="http://www.spx.com/role/GoodwillandOtherIntangibleAssets">
        <link:definition>9952168 - Disclosure - Goodwill and Other Intangible Assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlans" roleURI="http://www.spx.com/role/EmployeeBenefitPlans">
        <link:definition>9952169 - Disclosure - Employee Benefit Plans</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxes" roleURI="http://www.spx.com/role/IncomeTaxes">
        <link:definition>9952170 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Indebtedness" roleURI="http://www.spx.com/role/Indebtedness">
        <link:definition>9952171 - Disclosure - Indebtedness</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeFinancialInstrumentsandConcentrationsofCreditRisk" roleURI="http://www.spx.com/role/DerivativeFinancialInstrumentsandConcentrationsofCreditRisk">
        <link:definition>9952172 - Disclosure - Derivative Financial Instruments and Concentrations of Credit Risk</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ContingentLiabilitiesandOtherMatters" roleURI="http://www.spx.com/role/ContingentLiabilitiesandOtherMatters">
        <link:definition>9952173 - Disclosure - Contingent Liabilities and Other Matters</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandLongTermIncentiveCompensation" roleURI="http://www.spx.com/role/ShareholdersEquityandLongTermIncentiveCompensation">
        <link:definition>9952174 - Disclosure - Shareholders' Equity and Long-Term Incentive Compensation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValue" roleURI="http://www.spx.com/role/FairValue">
        <link:definition>9952175 - Disclosure - Fair Value</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SubsequentEvent" roleURI="http://www.spx.com/role/SubsequentEvent">
        <link:definition>9952176 - Disclosure - Subsequent Event</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentationandSummaryofSignificantAccountingPoliciesPolicies" roleURI="http://www.spx.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesPolicies">
        <link:definition>9955511 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="UseofEstimatesTables" roleURI="http://www.spx.com/role/UseofEstimatesTables">
        <link:definition>9955512 - Disclosure - Use of Estimates (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleTables" roleURI="http://www.spx.com/role/AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleTables">
        <link:definition>9955513 - Disclosure - Acquisitions, Discontinued Operations, and the Asbestos Portfolio Sale (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuesfromContractsTables" roleURI="http://www.spx.com/role/RevenuesfromContractsTables">
        <link:definition>9955514 - Disclosure - Revenues from Contracts (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesTables" roleURI="http://www.spx.com/role/LeasesTables">
        <link:definition>9955515 - Disclosure - Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InformationonReportableSegmentsTables" roleURI="http://www.spx.com/role/InformationonReportableSegmentsTables">
        <link:definition>9955516 - Disclosure - Information on Reportable Segments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SpecialChargesNetTables" roleURI="http://www.spx.com/role/SpecialChargesNetTables">
        <link:definition>9955517 - Disclosure - Special Charges, Net (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesNetTables" roleURI="http://www.spx.com/role/InventoriesNetTables">
        <link:definition>9955518 - Disclosure - Inventories, Net (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandOtherIntangibleAssetsTables" roleURI="http://www.spx.com/role/GoodwillandOtherIntangibleAssetsTables">
        <link:definition>9955519 - Disclosure - Goodwill and Other Intangible Assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansTables" roleURI="http://www.spx.com/role/EmployeeBenefitPlansTables">
        <link:definition>9955520 - Disclosure - Employee Benefit Plans (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesTables" roleURI="http://www.spx.com/role/IncomeTaxesTables">
        <link:definition>9955521 - Disclosure - Income Taxes (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IndebtednessTables" roleURI="http://www.spx.com/role/IndebtednessTables">
        <link:definition>9955522 - Disclosure - Indebtedness (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandLongTermIncentiveCompensationTables" roleURI="http://www.spx.com/role/ShareholdersEquityandLongTermIncentiveCompensationTables">
        <link:definition>9955523 - Disclosure - Shareholders' Equity and Long-Term Incentive Compensation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentationandSummaryofSignificantAccountingPoliciesDetails" roleURI="http://www.spx.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesDetails">
        <link:definition>9955524 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="UseofEstimatesAccountsReceivableAllowancesDetails" roleURI="http://www.spx.com/role/UseofEstimatesAccountsReceivableAllowancesDetails">
        <link:definition>9955525 - Disclosure - Use of Estimates - Accounts Receivable Allowances (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="UseofEstimatesEstimatedUsefulLivesDetails" roleURI="http://www.spx.com/role/UseofEstimatesEstimatedUsefulLivesDetails">
        <link:definition>9955526 - Disclosure - Use of Estimates - Estimated Useful Lives (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="UseofEstimatesAccruedExpensesDetails" roleURI="http://www.spx.com/role/UseofEstimatesAccruedExpensesDetails">
        <link:definition>9955527 - Disclosure - Use of Estimates - Accrued Expenses (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="UseofEstimatesWarrantyDetails" roleURI="http://www.spx.com/role/UseofEstimatesWarrantyDetails">
        <link:definition>9955528 - Disclosure - Use of Estimates - Warranty (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleNarrativeDetails" roleURI="http://www.spx.com/role/AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleNarrativeDetails">
        <link:definition>9955529 - Disclosure - Acquisitions, Discontinued Operations, and the Asbestos Portfolio Sale - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleAcquisitionofASPEQDetails" roleURI="http://www.spx.com/role/AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleAcquisitionofASPEQDetails">
        <link:definition>9955530 - Disclosure - Acquisitions, Discontinued Operations, and the Asbestos Portfolio Sale- Acquisition of ASPEQ (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleProFormaResultsDetails" roleURI="http://www.spx.com/role/AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleProFormaResultsDetails">
        <link:definition>9955531 - Disclosure - Acquisitions, Discontinued Operations, and the Asbestos Portfolio Sale - Pro Forma Results (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleWindDownofDBTAssetsandLiabilitiesofDiscontinuedOperationsDetails" roleURI="http://www.spx.com/role/AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleWindDownofDBTAssetsandLiabilitiesofDiscontinuedOperationsDetails">
        <link:definition>9955532 - Disclosure - Acquisitions, Discontinued Operations, and the Asbestos Portfolio Sale - Wind-Down of DBT - Assets and Liabilities of Discontinued Operations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleWindDownofHeatTransferBusinessAssetsandLiabilitiesofDiscontinuedOperationsDetails" roleURI="http://www.spx.com/role/AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleWindDownofHeatTransferBusinessAssetsandLiabilitiesofDiscontinuedOperationsDetails">
        <link:definition>9955533 - Disclosure - Acquisitions, Discontinued Operations, and the Asbestos Portfolio Sale - Wind-Down of Heat Transfer Business - Assets and Liabilities of Discontinued Operations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleResultsofOperationsDetails" roleURI="http://www.spx.com/role/AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleResultsofOperationsDetails">
        <link:definition>9955534 - Disclosure - Acquisitions, Discontinued Operations, and the Asbestos Portfolio Sale - Results of Operations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleAsbestosPortfolioSaleDetails" roleURI="http://www.spx.com/role/AcquisitionsDiscontinuedOperationsandtheAsbestosPortfolioSaleAsbestosPortfolioSaleDetails">
        <link:definition>9955535 - Disclosure - Acquisitions, Discontinued Operations, and the Asbestos Portfolio Sale - Asbestos Portfolio Sale (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuesfromContractsRemainingPerformanceObligationsDetails" roleURI="http://www.spx.com/role/RevenuesfromContractsRemainingPerformanceObligationsDetails">
        <link:definition>9955536 - Disclosure - Revenues from Contracts - Remaining Performance Obligations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuesfromContractsRemainingPerformanceObligationsDetails_1" roleURI="http://www.spx.com/role/RevenuesfromContractsRemainingPerformanceObligationsDetails_1">
        <link:definition>9955536 - Disclosure - Revenues from Contracts - Remaining Performance Obligations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuesfromContractsNarrativeDetails" roleURI="http://www.spx.com/role/RevenuesfromContractsNarrativeDetails">
        <link:definition>9955537 - Disclosure - Revenues from Contracts - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuesfromContractsDisaggregatedRevenuesDetails" roleURI="http://www.spx.com/role/RevenuesfromContractsDisaggregatedRevenuesDetails">
        <link:definition>9955538 - Disclosure - Revenues from Contracts - Disaggregated Revenues (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuesfromContractsContractBalancesDetails" roleURI="http://www.spx.com/role/RevenuesfromContractsContractBalancesDetails">
        <link:definition>9955539 - Disclosure - Revenues from Contracts - Contract Balances (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesNarrativeDetails" roleURI="http://www.spx.com/role/LeasesNarrativeDetails">
        <link:definition>9955540 - Disclosure - Leases - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesLeaseCostDetails" roleURI="http://www.spx.com/role/LeasesLeaseCostDetails">
        <link:definition>9955541 - Disclosure - Leases - Lease Cost (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesSupplementalCashFlowInformationDetails" roleURI="http://www.spx.com/role/LeasesSupplementalCashFlowInformationDetails">
        <link:definition>9955542 - Disclosure - Leases - Supplemental Cash Flow Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesSupplementalBalanceSheetInformationDetails" roleURI="http://www.spx.com/role/LeasesSupplementalBalanceSheetInformationDetails">
        <link:definition>9955543 - Disclosure - Leases - Supplemental Balance Sheet Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesWeightedAverageRemainingLeaseTermsandDiscountRatesDetails" roleURI="http://www.spx.com/role/LeasesWeightedAverageRemainingLeaseTermsandDiscountRatesDetails">
        <link:definition>9955544 - Disclosure - Leases - Weighted Average Remaining Lease Terms and Discount Rates (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesFutureMinimumPaymentsDetails" roleURI="http://www.spx.com/role/LeasesFutureMinimumPaymentsDetails">
        <link:definition>9955545 - Disclosure - Leases - Future Minimum Payments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InformationonReportableSegmentsNarrativeDetails" roleURI="http://www.spx.com/role/InformationonReportableSegmentsNarrativeDetails">
        <link:definition>9955546 - Disclosure - Information on Reportable Segments - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InformationonReportableSegmentsFinancialDataDetails" roleURI="http://www.spx.com/role/InformationonReportableSegmentsFinancialDataDetails">
        <link:definition>9955547 - Disclosure - Information on Reportable Segments - Financial Data (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SpecialChargesNetNarrativeDetails" roleURI="http://www.spx.com/role/SpecialChargesNetNarrativeDetails">
        <link:definition>9955548 - Disclosure - Special Charges, Net - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SpecialChargesNetSpecialChargesDetails" roleURI="http://www.spx.com/role/SpecialChargesNetSpecialChargesDetails">
        <link:definition>9955549 - Disclosure - Special Charges, Net - Special Charges (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SpecialChargesNetAnalysisofRestructuringLiabilitiesDetails" roleURI="http://www.spx.com/role/SpecialChargesNetAnalysisofRestructuringLiabilitiesDetails">
        <link:definition>9955550 - Disclosure - Special Charges, Net - Analysis of Restructuring Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesNetDetails" roleURI="http://www.spx.com/role/InventoriesNetDetails">
        <link:definition>9955551 - Disclosure - Inventories, Net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandOtherIntangibleAssetsGoodwillDetails" roleURI="http://www.spx.com/role/GoodwillandOtherIntangibleAssetsGoodwillDetails">
        <link:definition>9955552 - Disclosure - Goodwill and Other Intangible Assets - Goodwill (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandOtherIntangibleAssetsIntangiblesAssetsDetails" roleURI="http://www.spx.com/role/GoodwillandOtherIntangibleAssetsIntangiblesAssetsDetails">
        <link:definition>9955553 - Disclosure - Goodwill and Other Intangible Assets - Intangibles Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandOtherIntangibleAssetsNarrativeDetails" roleURI="http://www.spx.com/role/GoodwillandOtherIntangibleAssetsNarrativeDetails">
        <link:definition>9955554 - Disclosure - Goodwill and Other Intangible Assets - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansDefinedBenefitPensionPlansNarrativeDetails" roleURI="http://www.spx.com/role/EmployeeBenefitPlansDefinedBenefitPensionPlansNarrativeDetails">
        <link:definition>9955555 - Disclosure - Employee Benefit Plans - Defined Benefit Pension Plans - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansActualAssetAllocationPercentagesDetails" roleURI="http://www.spx.com/role/EmployeeBenefitPlansActualAssetAllocationPercentagesDetails">
        <link:definition>9955556 - Disclosure - Employee Benefit Plans - Actual Asset Allocation Percentages (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansFairValuesofPensionPlanAssetsDetails" roleURI="http://www.spx.com/role/EmployeeBenefitPlansFairValuesofPensionPlanAssetsDetails">
        <link:definition>9955557 - Disclosure - Employee Benefit Plans - Fair Values of Pension Plan Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansEmployerContributionsDetails" roleURI="http://www.spx.com/role/EmployeeBenefitPlansEmployerContributionsDetails">
        <link:definition>9955558 - Disclosure - Employee Benefit Plans - Employer Contributions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansEstimatedFutureBenefitPaymentsDetails" roleURI="http://www.spx.com/role/EmployeeBenefitPlansEstimatedFutureBenefitPaymentsDetails">
        <link:definition>9955559 - Disclosure - Employee Benefit Plans - Estimated Future Benefit Payments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansObligationsandFundedStatusNarrativeDetails" roleURI="http://www.spx.com/role/EmployeeBenefitPlansObligationsandFundedStatusNarrativeDetails">
        <link:definition>9955560 - Disclosure - Employee Benefit Plans - Obligations and Funded Status Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansObligationsandFundedStatusDetails" roleURI="http://www.spx.com/role/EmployeeBenefitPlansObligationsandFundedStatusDetails">
        <link:definition>9955561 - Disclosure - Employee Benefit Plans - Obligations and Funded Status (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansNetPeriodicExpenseIncomeandAdditionalInformationDetails" roleURI="http://www.spx.com/role/EmployeeBenefitPlansNetPeriodicExpenseIncomeandAdditionalInformationDetails">
        <link:definition>9955562 - Disclosure - Employee Benefit Plans - Net Periodic Expense (Income) and Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansPostretirementBenefitPlansDetails" roleURI="http://www.spx.com/role/EmployeeBenefitPlansPostretirementBenefitPlansDetails">
        <link:definition>9955563 - Disclosure - Employee Benefit Plans - Postretirement Benefit Plans (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EmployeeBenefitPlansDefinedContributionRetirementPlansDetails" roleURI="http://www.spx.com/role/EmployeeBenefitPlansDefinedContributionRetirementPlansDetails">
        <link:definition>9955564 - Disclosure - Employee Benefit Plans - Defined Contribution Retirement Plans (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesIncomeTaxesProvisionforBenefitDetails" roleURI="http://www.spx.com/role/IncomeTaxesIncomeTaxesProvisionforBenefitDetails">
        <link:definition>9955565 - Disclosure - Income Taxes - Income Taxes (Provision for) Benefit (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesEffectiveIncomeTaxRateDetails" roleURI="http://www.spx.com/role/IncomeTaxesEffectiveIncomeTaxRateDetails">
        <link:definition>9955566 - Disclosure - Income Taxes - Effective Income Tax Rate (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesDeferredTaxAssetsandLiabilitiesDetails" roleURI="http://www.spx.com/role/IncomeTaxesDeferredTaxAssetsandLiabilitiesDetails">
        <link:definition>9955567 - Disclosure - Income Taxes - Deferred Tax Assets and Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesNarrativeDetails" roleURI="http://www.spx.com/role/IncomeTaxesNarrativeDetails">
        <link:definition>9955568 - Disclosure - Income Taxes - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesScheduleofUnrecognizedTaxBenefitsDetails" roleURI="http://www.spx.com/role/IncomeTaxesScheduleofUnrecognizedTaxBenefitsDetails">
        <link:definition>9955569 - Disclosure - Income Taxes - Schedule of Unrecognized Tax Benefits (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IndebtednessSummaryofDebtActivityDetails" roleURI="http://www.spx.com/role/IndebtednessSummaryofDebtActivityDetails">
        <link:definition>9955570 - Disclosure - Indebtedness - Summary of Debt Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IndebtednessDebtNarrativeDetails" roleURI="http://www.spx.com/role/IndebtednessDebtNarrativeDetails">
        <link:definition>9955571 - Disclosure - Indebtedness - Debt - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IndebtednessSeniorCreditFacilitiesDetails" roleURI="http://www.spx.com/role/IndebtednessSeniorCreditFacilitiesDetails">
        <link:definition>9955572 - Disclosure - Indebtedness - Senior Credit Facilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IndebtednessConsolidatedLeverageRatioDetails" roleURI="http://www.spx.com/role/IndebtednessConsolidatedLeverageRatioDetails">
        <link:definition>9955573 - Disclosure - Indebtedness - Consolidated Leverage Ratio (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IndebtednessRateandMarginsDetails" roleURI="http://www.spx.com/role/IndebtednessRateandMarginsDetails">
        <link:definition>9955574 - Disclosure - Indebtedness - Rate and Margins (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeFinancialInstrumentsandConcentrationsofCreditRiskDetails" roleURI="http://www.spx.com/role/DerivativeFinancialInstrumentsandConcentrationsofCreditRiskDetails">
        <link:definition>9955575 - Disclosure - Derivative Financial Instruments and Concentrations of Credit Risk (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ContingentLiabilitiesandOtherMattersSpinOffAndGeneralDetails" roleURI="http://www.spx.com/role/ContingentLiabilitiesandOtherMattersSpinOffAndGeneralDetails">
        <link:definition>9955576 - Disclosure - Contingent Liabilities and Other Matters - Spin-Off And General (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ContingentLiabilitiesandOtherMattersClaimforContingentConsiderationrelatedtoULCDetails" roleURI="http://www.spx.com/role/ContingentLiabilitiesandOtherMattersClaimforContingentConsiderationrelatedtoULCDetails">
        <link:definition>9955577 - Disclosure - Contingent Liabilities and Other Matters - Claim for Contingent Consideration related to ULC (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ContingentLiabilitiesandOtherMattersResolutionofDisputewithFormerRepresentativeDetails" roleURI="http://www.spx.com/role/ContingentLiabilitiesandOtherMattersResolutionofDisputewithFormerRepresentativeDetails">
        <link:definition>9955578 - Disclosure - Contingent Liabilities and Other Matters - Resolution of Dispute with Former Representative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ContingentLiabilitiesandOtherMattersLargePowerProjectsinSouthAfricaDetails" roleURI="http://www.spx.com/role/ContingentLiabilitiesandOtherMattersLargePowerProjectsinSouthAfricaDetails">
        <link:definition>9955579 - Disclosure - Contingent Liabilities and Other Matters - Large Power Projects in South Africa (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ContingentLiabilitiesandOtherMattersEnvironmentalMattersDetails" roleURI="http://www.spx.com/role/ContingentLiabilitiesandOtherMattersEnvironmentalMattersDetails">
        <link:definition>9955580 - Disclosure - Contingent Liabilities and Other Matters - Environmental Matters (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ContingentLiabilitiesandOtherMattersExecutiveAgreementsDetails" roleURI="http://www.spx.com/role/ContingentLiabilitiesandOtherMattersExecutiveAgreementsDetails">
        <link:definition>9955581 - Disclosure - Contingent Liabilities and Other Matters - Executive Agreements (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandLongTermIncentiveCompensationComponentsUsedforCalculationofBasicandDilutedIncomeLossDetails" roleURI="http://www.spx.com/role/ShareholdersEquityandLongTermIncentiveCompensationComponentsUsedforCalculationofBasicandDilutedIncomeLossDetails">
        <link:definition>9955582 - Disclosure - Shareholders' Equity and Long-Term Incentive Compensation - Components Used for Calculation of Basic and Diluted Income (Loss) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandLongTermIncentiveCompensationIncomePerShareandCommonStockandTreasuryStockNarrativeDetails" roleURI="http://www.spx.com/role/ShareholdersEquityandLongTermIncentiveCompensationIncomePerShareandCommonStockandTreasuryStockNarrativeDetails">
        <link:definition>9955583 - Disclosure - Shareholders' Equity and Long-Term Incentive Compensation - Income Per Share and Common Stock and Treasury Stock - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandLongTermIncentiveCompensationCommonStockandTreasuryStockDetails" roleURI="http://www.spx.com/role/ShareholdersEquityandLongTermIncentiveCompensationCommonStockandTreasuryStockDetails">
        <link:definition>9955584 - Disclosure - Shareholders' Equity and Long-Term Incentive Compensation - Common Stock and Treasury Stock (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandLongTermIncentiveCompensationLongTermIncentiveCompensationNarrativeDetails" roleURI="http://www.spx.com/role/ShareholdersEquityandLongTermIncentiveCompensationLongTermIncentiveCompensationNarrativeDetails">
        <link:definition>9955585 - Disclosure - Shareholders' Equity and Long-Term Incentive Compensation - Long-Term Incentive Compensation - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandLongTermIncentiveCompensationAssumptionsInDeterminingTheFairValueofAwardsGrantedDetails" roleURI="http://www.spx.com/role/ShareholdersEquityandLongTermIncentiveCompensationAssumptionsInDeterminingTheFairValueofAwardsGrantedDetails">
        <link:definition>9955586 - Disclosure - Shareholders' Equity and Long-Term Incentive Compensation - Assumptions In Determining The Fair Value of Awards Granted (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandLongTermIncentiveCompensationSummaryofPerformanceSharesRestrictedStockUnitsAndRestrictedStockDetails" roleURI="http://www.spx.com/role/ShareholdersEquityandLongTermIncentiveCompensationSummaryofPerformanceSharesRestrictedStockUnitsAndRestrictedStockDetails">
        <link:definition>9955587 - Disclosure - Shareholders' Equity and Long-Term Incentive Compensation - Summary of Performance Shares, Restricted Stock Units And Restricted Stock (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandLongTermIncentiveCompensationStockOptionNarrativeDetails" roleURI="http://www.spx.com/role/ShareholdersEquityandLongTermIncentiveCompensationStockOptionNarrativeDetails">
        <link:definition>9955588 - Disclosure - Shareholders' Equity and Long-Term Incentive Compensation - Stock Option - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandLongTermIncentiveCompensationBlackScholesOptionPricingModelDetails" roleURI="http://www.spx.com/role/ShareholdersEquityandLongTermIncentiveCompensationBlackScholesOptionPricingModelDetails">
        <link:definition>9955589 - Disclosure - Shareholders' Equity and Long-Term Incentive Compensation - Black-Scholes Option-Pricing Model (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandLongTermIncentiveCompensationStockOptionActivityDetails" roleURI="http://www.spx.com/role/ShareholdersEquityandLongTermIncentiveCompensationStockOptionActivityDetails">
        <link:definition>9955590 - Disclosure - Shareholders' Equity and Long-Term Incentive Compensation - Stock Option Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandLongTermIncentiveCompensationAOCIDetails" roleURI="http://www.spx.com/role/ShareholdersEquityandLongTermIncentiveCompensationAOCIDetails">
        <link:definition>9955591 - Disclosure - Shareholders' Equity and Long-Term Incentive Compensation - AOCI (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandLongTermIncentiveCompensationSummaryofReclassifiedComponentsofAOCIDetails" roleURI="http://www.spx.com/role/ShareholdersEquityandLongTermIncentiveCompensationSummaryofReclassifiedComponentsofAOCIDetails">
        <link:definition>9955592 - Disclosure - Shareholders' Equity and Long-Term Incentive Compensation - Summary of Reclassified Components of AOCI (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandLongTermIncentiveCompensationCommonStockinTreasuryDividendsandPreferredStockNarrativeDetails" roleURI="http://www.spx.com/role/ShareholdersEquityandLongTermIncentiveCompensationCommonStockinTreasuryDividendsandPreferredStockNarrativeDetails">
        <link:definition>9955593 - Disclosure - Shareholders' Equity and Long-Term Incentive Compensation - Common Stock in Treasury, Dividends and Preferred Stock - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueNarrativeDetails" roleURI="http://www.spx.com/role/FairValueNarrativeDetails">
        <link:definition>9955594 - Disclosure - Fair Value - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SubsequentEventDetails" roleURI="http://www.spx.com/role/SubsequentEventDetails">
        <link:definition>9955595 - Disclosure - Subsequent Event (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="spxc_AuditInformationAbstract" abstract="true" name="AuditInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_SpecialChargesNet" abstract="false" name="SpecialChargesNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_AssetsOfAbandonedEntities" abstract="false" name="AssetsOfAbandonedEntities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LiabilitiesOfAbandonedEntities" abstract="false" name="LiabilitiesOfAbandonedEntities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_CashAndCashEquivalentsIncludedInAssetsOfAbandonedEntities" abstract="false" name="CashAndCashEquivalentsIncludedInAssetsOfAbandonedEntities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_APICShareBasedPaymentArrangementLongTermIncentiveCompensationExpense" abstract="false" name="APICShareBasedPaymentArrangementLongTermIncentiveCompensationExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LossOnDivestitureOfAsbestosRelatedAssetsAndLiabilities" abstract="false" name="LossOnDivestitureOfAsbestosRelatedAssetsAndLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_GainLossOnAmendmentAndOrRefinancingOfDebt" abstract="false" name="GainLossOnAmendmentAndOrRefinancingOfDebt" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ContributionToDivestAsbestosRelatedAssetsAndLiabilities" abstract="false" name="ContributionToDivestAsbestosRelatedAssetsAndLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_BorrowingsUnderSeniorCreditFacilities" abstract="false" name="BorrowingsUnderSeniorCreditFacilities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_RepaymentsUnderSeniorCreditFacilities" abstract="false" name="RepaymentsUnderSeniorCreditFacilities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_BorrowingUnderTradeReceivablesAgreement" abstract="false" name="BorrowingUnderTradeReceivablesAgreement" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_RepaymentsUnderTradeReceivablesAgreement" abstract="false" name="RepaymentsUnderTradeReceivablesAgreement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_PaymentProceedsTaxWithholdingShareBasedPaymentArrangement" abstract="false" name="PaymentProceedsTaxWithholdingShareBasedPaymentArrangement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ComponentsOfCashAndCashEquivalentsAbstract" abstract="true" name="ComponentsOfCashAndCashEquivalentsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_UseOfEstimatesTextBlock" abstract="false" name="UseOfEstimatesTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_AcquisitionsDispositionsAndDiscontinuedOperationsAbstract" abstract="true" name="AcquisitionsDispositionsAndDiscontinuedOperationsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_EquityAndStockBasedCompensationDisclosureAbstract" abstract="true" name="EquityAndStockBasedCompensationDisclosureAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_CompanyOwnedLifeInsurancePoliciesPolicyTextBlock" abstract="false" name="CompanyOwnedLifeInsurancePoliciesPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="spxc_ImpairmentOfLongLivedAssetsAndFiniteLivedIntangibleAssetsPolicyTextBlock" abstract="false" name="ImpairmentOfLongLivedAssetsAndFiniteLivedIntangibleAssetsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_AccruedExpensesPolicyTextBlock" abstract="false" name="AccruedExpensesPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_EnvironmentalCompliancePolicyTextBlock" abstract="false" name="EnvironmentalCompliancePolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_GoodwillIndefiniteLivedIntangibleAndOtherLongLivedAssetsPolicyTextBlock" abstract="false" name="GoodwillIndefiniteLivedIntangibleAndOtherLongLivedAssetsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_AssetsAndLiabilitiesLesseeTableTextBlock" abstract="false" name="AssetsAndLiabilitiesLesseeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_ScheduleOfRestructuringImpairmentAndOtherActivitiesBySegmentTableTextBlock" abstract="false" name="ScheduleOfRestructuringImpairmentAndOtherActivitiesBySegmentTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_ScheduleofRestructuringandIntegratedLiabilitiesTableTextBlock" abstract="false" name="ScheduleofRestructuringandIntegratedLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_ScheduleOfFundedStatusAndAmountsRecognizedInBalanceSheetAndAccumulatedOtherComprehensiveIncomeLossTableTextBlock" abstract="false" name="ScheduleOfFundedStatusAndAmountsRecognizedInBalanceSheetAndAccumulatedOtherComprehensiveIncomeLossTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_ScheduleOfExpectedBenefitPaymentsAndFederalSubsidiesTableTextBlock" abstract="false" name="ScheduleOfExpectedBenefitPaymentsAndFederalSubsidiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_ScheduleOfShareBasedPaymentAwardRestrictedStockActivityValuationAssumptionsTableTextBlock" abstract="false" name="ScheduleOfShareBasedPaymentAwardRestrictedStockActivityValuationAssumptionsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_SPXTransformerSolutionsIncMember" abstract="true" name="SPXTransformerSolutionsIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_IngeniaTechnologiesInc.Member" abstract="true" name="IngeniaTechnologiesInc.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_TAMorrisonCoIncTAMCOMember" abstract="true" name="TAMorrisonCoIncTAMCOMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_ASPEQHeatingGroupMember" abstract="true" name="ASPEQHeatingGroupMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_InternationalTowerLightingLLCMember" abstract="true" name="InternationalTowerLightingLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_LegacySPXMember" abstract="true" name="LegacySPXMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_CanvasHoldcoLLCMember" abstract="true" name="CanvasHoldcoLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_TransformerSolutionsMember" abstract="true" name="TransformerSolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_TheSubsidiariesMember" abstract="true" name="TheSubsidiariesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_PaymentForDivestiture" abstract="false" name="PaymentForDivestiture" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_NumberOfSubsidiariesDivested" abstract="false" name="NumberOfSubsidiariesDivested" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_PaymentForDivestitures" abstract="false" name="PaymentForDivestitures" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DepreciationExpenseAndAmortizationOfCapitalLeases" abstract="false" name="DepreciationExpenseAndAmortizationOfCapitalLeases" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_BorrowingsFromLifeInsurancePolicies" abstract="false" name="BorrowingsFromLifeInsurancePolicies" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LifeInsuranceCorporateOrBankOwnedInterestRate" abstract="false" name="LifeInsuranceCorporateOrBankOwnedInterestRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="spxc_AccountsReceivableAllowanceForCreditLossAcquisitions" abstract="false" name="AccountsReceivableAllowanceForCreditLossAcquisitions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_TechnologyMember" abstract="true" name="TechnologyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_OtherMember" abstract="true" name="OtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_DBTTechnologiesMember" abstract="true" name="DBTTechnologiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_LargePowerProjectsMember" abstract="true" name="LargePowerProjectsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_MHIAdditionalClaimsMember" abstract="true" name="MHIAdditionalClaimsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_CustomerBacklogMember" abstract="true" name="CustomerBacklogMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_TriggeringEventAxis" abstract="true" name="TriggeringEventAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="spxc_TriggeringEventDomain" abstract="true" name="TriggeringEventDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_PaidIn2024Member" abstract="true" name="PaidIn2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_NumberOfLargePowerProjects" abstract="false" name="NumberOfLargePowerProjects" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationSettlementCharges" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationSettlementCharges" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_AccountsReceivableAndOtherAssetsWriteOff" abstract="false" name="AccountsReceivableAndOtherAssetsWriteOff" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_NumberOfDisputes" abstract="false" name="NumberOfDisputes" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationCashPayments" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationCashPayments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationTransactionCosts" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationTransactionCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsAbstract" abstract="true" name="BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_BusinessAcquisitionProFormaEarningsPerShareAbstract" abstract="true" name="BusinessAcquisitionProFormaEarningsPerShareAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_BuildingsAndLeaseholdImprovementsMember" abstract="true" name="BuildingsAndLeaseholdImprovementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentAbstract" abstract="true" name="DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentGross" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentGross" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationAccumulatedDepreciation" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationAccumulatedDepreciation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationContractLiabilitiesCurrent" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationContractLiabilitiesCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_AcquisitionsAndDiscontinuedOperationsAbstract" abstract="true" name="AcquisitionsAndDiscontinuedOperationsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_SPXHeatTransferBusinessMember" abstract="true" name="SPXHeatTransferBusinessMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DBTTechnologiesIncludingCTAWriteOffMember" abstract="true" name="DBTTechnologiesIncludingCTAWriteOffMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_ALLOtherDiscontinuedOperationsMember" abstract="true" name="ALLOtherDiscontinuedOperationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_AsbestosPortfolioSaleMember" abstract="true" name="AsbestosPortfolioSaleMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationGainLossOnDisposalBeforeTransactionCosts" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationGainLossOnDisposalBeforeTransactionCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_HVACMember" abstract="true" name="HVACMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DetectionAndMeasurementMember" abstract="true" name="DetectionAndMeasurementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_ProcessCoolingEquipmentAndServicesMember" abstract="true" name="ProcessCoolingEquipmentAndServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_CommunicationTechnologiesAidsToNavigationAndTransportationSystemsMember" abstract="true" name="CommunicationTechnologiesAidsToNavigationAndTransportationSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_RevenuePerformanceObligationContractTerm" abstract="false" name="RevenuePerformanceObligationContractTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_RevenuePerformanceObligationPaymentPeriod" abstract="false" name="RevenuePerformanceObligationPaymentPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_RevenuePaymentTermForReplacementAndSpareParts" abstract="false" name="RevenuePaymentTermForReplacementAndSpareParts" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_PackageAndProcessCoolingEquipmentAndServicesAndEngineeredAirMovementSolutionsMember" abstract="true" name="PackageAndProcessCoolingEquipmentAndServicesAndEngineeredAirMovementSolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_BoilersElectricalHeatingAndVentilationMember" abstract="true" name="BoilersElectricalHeatingAndVentilationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_UndergroundLocatorsInspectionsAndRehabilitationEquipmentAndRoboticSystemsMember" abstract="true" name="UndergroundLocatorsInspectionsAndRehabilitationEquipmentAndRoboticSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_IncreaseDecreaseinAccountsReceivableNet" abstract="false" name="IncreaseDecreaseinAccountsReceivableNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_IncreaseDecreaseinContractwithCustomerAssetNetCurrent" abstract="false" name="IncreaseDecreaseinContractwithCustomerAssetNetCurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_IncreaseDecreaseinContractwithCustomerLiabilityCurrent" abstract="false" name="IncreaseDecreaseinContractwithCustomerLiabilityCurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_IncreaseDecreaseinContractwithCustomerLiabilityNoncurrent" abstract="false" name="IncreaseDecreaseinContractwithCustomerLiabilityNoncurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ContractwithCustomersNet" abstract="false" name="ContractwithCustomersNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_IncreaseDecreaseinContractwithCustomersNet" abstract="false" name="IncreaseDecreaseinContractwithCustomersNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LeaseRemainingLeaseTerm" abstract="false" name="LeaseRemainingLeaseTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_LesseeLeaseRenewalTerm" abstract="false" name="LesseeLeaseRenewalTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_LesseeLeaseTerminationPeriod" abstract="false" name="LesseeLeaseTerminationPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_FinanceLeaseCostsAbstract" abstract="true" name="FinanceLeaseCostsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_FinanceLeaseCost" abstract="false" name="FinanceLeaseCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_CashPaidForAmountsIncludedInTheMeasurementOfLeaseLiabilitiesAbstract" abstract="true" name="CashPaidForAmountsIncludedInTheMeasurementOfLeaseLiabilitiesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_SupplementalCashflowNonCashActivitiesAbstract" abstract="true" name="SupplementalCashflowNonCashActivitiesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_OperatingLeasesAbstract" abstract="true" name="OperatingLeasesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_FinanceLeasesAbstract" abstract="true" name="FinanceLeasesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_OperatingAndFinancialLeasesTotalAbstract" abstract="true" name="OperatingAndFinancialLeasesTotalAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_LeaseLiabilityPaymentsDueInNextRollingTwelveMonths" abstract="false" name="LeaseLiabilityPaymentsDueInNextRollingTwelveMonths" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LeaseLiabilityPaymentsDueInRollingYearTwo" abstract="false" name="LeaseLiabilityPaymentsDueInRollingYearTwo" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LeaseLiabilityPaymentsDueInRollingYearThree" abstract="false" name="LeaseLiabilityPaymentsDueInRollingYearThree" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LeaseLiabilityPaymentsDueInRollingYearFour" abstract="false" name="LeaseLiabilityPaymentsDueInRollingYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LeaseLiabilityPaymentsDueInRollingYearFive" abstract="false" name="LeaseLiabilityPaymentsDueInRollingYearFive" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LeaseLiabilityPaymentsDueInRollingAfterYearFive" abstract="false" name="LeaseLiabilityPaymentsDueInRollingAfterYearFive" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LeaseLiabilityPaymentsDue" abstract="false" name="LeaseLiabilityPaymentsDue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LeaseLiabilityUndiscountedExcessAmount" abstract="false" name="LeaseLiabilityUndiscountedExcessAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LeaseLiability" abstract="false" name="LeaseLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_NumberOfCountriesInWhichEntitySellsItsProductsAndServices" abstract="false" name="NumberOfCountriesInWhichEntitySellsItsProductsAndServices" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_SegmentReportingMember" abstract="true" name="SegmentReportingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_OtherForeignCountriesMember" abstract="true" name="OtherForeignCountriesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_GoodwillAndTrademarksMember" abstract="true" name="GoodwillAndTrademarksMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_ULCRoboticsMember" abstract="true" name="ULCRoboticsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_EnterpriseControlSystemsLtdMember" abstract="true" name="EnterpriseControlSystemsLtdMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_ResolutionOfDisputeWithFormerAgentMember" abstract="true" name="ResolutionOfDisputeWithFormerAgentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_LongLivedAssetsOfContinuingOperations" abstract="false" name="LongLivedAssetsOfContinuingOperations" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LongLivedAssetsOfDiscontinuedOperations" abstract="false" name="LongLivedAssetsOfDiscontinuedOperations" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_BusinessCombinationContingentConsiderationReversalOfLiability" abstract="false" name="BusinessCombinationContingentConsiderationReversalOfLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_PeriodWithinWhichAssetWillBeSold" abstract="false" name="PeriodWithinWhichAssetWillBeSold" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_PeriodWithinWhichLiabilitiesWillBeSettled" abstract="false" name="PeriodWithinWhichLiabilitiesWillBeSettled" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_RestructuringAndIntegrationReserves" abstract="false" name="RestructuringAndIntegrationReserves" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_RestructuringAndIntegrationReservesPeriodExpense" abstract="false" name="RestructuringAndIntegrationReservesPeriodExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_RestructuringAndIntegrationReserveSettledWithCash" abstract="false" name="RestructuringAndIntegrationReserveSettledWithCash" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_SpecialChargesNonCash" abstract="false" name="SpecialChargesNonCash" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ITLAcquisitionMember" abstract="true" name="ITLAcquisitionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_GrossGoodwillRelatedToForeignCurrencyTranslationAndOther" abstract="false" name="GrossGoodwillRelatedToForeignCurrencyTranslationAndOther" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_AccumulatedImpairmentsRelatedToForeignCurrencyTranslationAndOther" abstract="false" name="AccumulatedImpairmentsRelatedToForeignCurrencyTranslationAndOther" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_GoodwillRelatedToForeignCurrencyTranslationAndOther" abstract="false" name="GoodwillRelatedToForeignCurrencyTranslationAndOther" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_SPXPostretirementPlansMember" abstract="true" name="SPXPostretirementPlansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DefinedBenefitPlanBenefitObligationConsiderationPaidToCarrier" abstract="false" name="DefinedBenefitPlanBenefitObligationConsiderationPaidToCarrier" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DefinedBenefitPlanBenefitObligationLossOnSettlement" abstract="false" name="DefinedBenefitPlanBenefitObligationLossOnSettlement" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_CommingledGlobalFundAllocationsMember" abstract="true" name="CommingledGlobalFundAllocationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_ShortTermInvestmentsAndOtherMember" abstract="true" name="ShortTermInvestmentsAndOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DefinedBenefitPlanContributionsByEmployerAndPlanParticipants" abstract="false" name="DefinedBenefitPlanContributionsByEmployerAndPlanParticipants" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_CanadianPensionPlansMember" abstract="true" name="CanadianPensionPlansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_DefinedBenefitPlanUnfundedStatusOfPlan" abstract="false" name="DefinedBenefitPlanUnfundedStatusOfPlan" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DefinedContributionPlanNumberOfSharesContributed" abstract="false" name="DefinedContributionPlanNumberOfSharesContributed" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="spxc_DefinedContributionPlanFairValueofPlanAssets" abstract="false" name="DefinedContributionPlanFairValueofPlanAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_EffectiveIncomeTaxRateReconciliationTaxCreditsAndExemptions" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxCreditsAndExemptions" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_EffectiveIncomeTaxRateReconciliationImpairmentAndBasisAdjustmentsPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationImpairmentAndBasisAdjustmentsPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_EffectiveIncomeTaxRateReconciliationTaxAdjustmentsToContingentConsideration" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxAdjustmentsToContingentConsideration" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_EffectiveIncomeTaxRateReconciliationNonDeductibleLossOnDispositionOfBusinessPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationNonDeductibleLossOnDispositionOfBusinessPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_DeferredTaxAssetsNetOperatingLossAndTaxCreditCarryforwards" abstract="false" name="DeferredTaxAssetsNetOperatingLossAndTaxCreditCarryforwards" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionOtherPostretirementAndPostemploymentBenefits" abstract="false" name="DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionOtherPostretirementAndPostemploymentBenefits" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLegalEnvironmentalAndSelfInsurance" abstract="false" name="DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLegalEnvironmentalAndSelfInsurance" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ExpiringInYearOneMember" abstract="true" name="ExpiringInYearOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_ExpiringAfterYearOneMember" abstract="true" name="ExpiringAfterYearOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_UnrecognizedTaxBenefitsNet" abstract="false" name="UnrecognizedTaxBenefitsNet" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccruedNet" abstract="false" name="UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccruedNet" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_EffectiveIncomeTaxRateReconciliationTaxExpenseBenefitUncertainTaxPositionAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxExpenseBenefitUncertainTaxPositionAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ScheduleOfDebtInstrumentsTable" abstract="true" name="ScheduleOfDebtInstrumentsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="spxc_IncrementalLoanMember" abstract="true" name="IncrementalLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_CurrentRevolvingSPXFacilitiesMember" abstract="true" name="CurrentRevolvingSPXFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_CurrentSPXTermLoanFacilitiesMember" abstract="true" name="CurrentSPXTermLoanFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_OtherBorrowingsMember" abstract="true" name="OtherBorrowingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SeniorCreditFacilitiesMember" abstract="true" name="SeniorCreditFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DebtRollForward" abstract="true" name="DebtRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_DebtInstrumentPeriodicPaymentPercentageOfPrincipal" abstract="false" name="DebtInstrumentPeriodicPaymentPercentageOfPrincipal" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_CreditAgreementMember" abstract="true" name="CreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_FinancialLettersOfCreditMember" abstract="true" name="FinancialLettersOfCreditMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_NonFinancialLettersOfCreditMember" abstract="true" name="NonFinancialLettersOfCreditMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_NonUSExposureMember" abstract="true" name="NonUSExposureMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_BilateralForeignCreditInstrumentFacilityMember" abstract="true" name="BilateralForeignCreditInstrumentFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_IncrementalTermLoansMember" abstract="true" name="IncrementalTermLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SecuredOvernightFinancingRateSOFRPeriodOneMember" abstract="true" name="SecuredOvernightFinancingRateSOFRPeriodOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SecuredOvernightFinancingRateSOFRPeriodThreeMember" abstract="true" name="SecuredOvernightFinancingRateSOFRPeriodThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SecuredOvernightFinancingRateSOFRPeriodFourMember" abstract="true" name="SecuredOvernightFinancingRateSOFRPeriodFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_LastDayOfAnyFiscalQuarterMember" abstract="true" name="LastDayOfAnyFiscalQuarterMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_FourFiscalQuartersAfterCertainPermittedAcquisitionsMember" abstract="true" name="FourFiscalQuartersAfterCertainPermittedAcquisitionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_FourFiscalQuartersAfterCertainPermittedAcquisitionsFinancedByUnsecuredDebtMember" abstract="true" name="FourFiscalQuartersAfterCertainPermittedAcquisitionsFinancedByUnsecuredDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DebtInstrumentNumberOfDrawings" abstract="false" name="DebtInstrumentNumberOfDrawings" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsConsolidatedCoverageRatio" abstract="false" name="DebtInstrumentCovenantTermsConsolidatedCoverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsConsolidatedInterestCoverageRatio" abstract="false" name="DebtInstrumentCovenantTermsConsolidatedInterestCoverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="spxc_EBITDAConsolidatedCoverageRatio" abstract="false" name="EBITDAConsolidatedCoverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="spxc_DebtInstrumentBasisSpreadOnVariableRateBase" abstract="false" name="DebtInstrumentBasisSpreadOnVariableRateBase" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_DebtInstrumentBasisSpreadonVariableRateDurationofInterestPeriod" abstract="false" name="DebtInstrumentBasisSpreadonVariableRateDurationofInterestPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_DebtInstrumentFrontingFee" abstract="false" name="DebtInstrumentFrontingFee" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsMaximumPeriodtoReinvestProceeds" abstract="false" name="DebtInstrumentCovenantTermsMaximumPeriodtoReinvestProceeds" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_DebtInstrumentAdditionalPeriodtoReinvestProceedsifCommittedtobeReinvested" abstract="false" name="DebtInstrumentAdditionalPeriodtoReinvestProceedsifCommittedtobeReinvested" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_DebtInstrumentCollateralPercentageofCapitalStockofDomesticSubsidiaries" abstract="false" name="DebtInstrumentCollateralPercentageofCapitalStockofDomesticSubsidiaries" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_DebtInstrumentCollateralPercentageofCapitalStockofMaterialFirstTierForeignSubsidiaries" abstract="false" name="DebtInstrumentCollateralPercentageofCapitalStockofMaterialFirstTierForeignSubsidiaries" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_DebtInstrumentCollateralPercentageOfNonVotingCapitalStockOfMaterialFirstTierForeignSubsidiaries" abstract="false" name="DebtInstrumentCollateralPercentageOfNonVotingCapitalStockOfMaterialFirstTierForeignSubsidiaries" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsMaximumConsolidatedLeverageRatiotoRepurchaseCapitalStockandPayDividends" abstract="false" name="DebtInstrumentCovenantTermsMaximumConsolidatedLeverageRatiotoRepurchaseCapitalStockandPayDividends" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsAggregateAmountofCapitalStockRepurchasesandDividendDeclarations" abstract="false" name="DebtInstrumentCovenantTermsAggregateAmountofCapitalStockRepurchasesandDividendDeclarations" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsAdditionalAmountofCapitalStockRepurchasesandDividendDeclarations" abstract="false" name="DebtInstrumentCovenantTermsAdditionalAmountofCapitalStockRepurchasesandDividendDeclarations" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsPercentageofCumulativeConsolidatedNetIncome" abstract="false" name="DebtInstrumentCovenantTermsPercentageofCumulativeConsolidatedNetIncome" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsPercentageofConsolidatedNetDeficit" abstract="false" name="DebtInstrumentCovenantTermsPercentageofConsolidatedNetDeficit" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_DebtInstrumentRenewalPeriod" abstract="false" name="DebtInstrumentRenewalPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_NonFinancialLetterOfCreditFeeMember" abstract="true" name="NonFinancialLetterOfCreditFeeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_SeniorCreditAgreementRange1Member" abstract="true" name="SeniorCreditAgreementRange1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SeniorCreditAgreementRange2Member" abstract="true" name="SeniorCreditAgreementRange2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SeniorCreditAgreementRange3Member" abstract="true" name="SeniorCreditAgreementRange3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SeniorCreditAgreementRange4Member" abstract="true" name="SeniorCreditAgreementRange4Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsConsolidatedLeverageRatio" abstract="false" name="DebtInstrumentCovenantTermsConsolidatedLeverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="spxc_DebtInstrumentFeePercentage" abstract="false" name="DebtInstrumentFeePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_InterestRateSwapThroughNovember2024Member" abstract="true" name="InterestRateSwapThroughNovember2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_InterestRateSwapFromDecember2024Member" abstract="true" name="InterestRateSwapFromDecember2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_MatureWithinOneYearMember" abstract="true" name="MatureWithinOneYearMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_OtherLongTermLiabilitiesMember" abstract="true" name="OtherLongTermLiabilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_IncomeFromContinuingOperationsBeforeIncomeTaxesMember" abstract="true" name="IncomeFromContinuingOperationsBeforeIncomeTaxesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_GainLossonDispositionofDiscontinuedOperationsNetofTaxMember" abstract="true" name="GainLossonDispositionofDiscontinuedOperationsNetofTaxMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_NumberOfWhollyOwnedSubsidiariesDivested" abstract="false" name="NumberOfWhollyOwnedSubsidiariesDivested" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_LiabilityForAsbestosAndEnvironmentalClaimsProceedsFromInsuranceRecoveries" abstract="false" name="LiabilityForAsbestosAndEnvironmentalClaimsProceedsFromInsuranceRecoveries" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_SiteContingencyNumberOfSites" abstract="false" name="SiteContingencyNumberOfSites" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_SiteContingencyNumberOfSitesOnWhichEntityPotentiallyResponsible" abstract="false" name="SiteContingencyNumberOfSitesOnWhichEntityPotentiallyResponsible" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_ExecutiveAgreementsAbstract" abstract="true" name="ExecutiveAgreementsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_PeriodOfRollingTermOfEmploymentAgreements" abstract="false" name="PeriodOfRollingTermOfEmploymentAgreements" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_SupplementalUnemploymentBenefitsNumberofIndividualswithSeveranceBenefitAgreements" abstract="false" name="SupplementalUnemploymentBenefitsNumberofIndividualswithSeveranceBenefitAgreements" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_UnvestedRestrictedStockAndRestrictedStockUnitsthatdidnotMeetRequiredMarketThresholdsforVestingMember" abstract="true" name="UnvestedRestrictedStockAndRestrictedStockUnitsthatdidnotMeetRequiredMarketThresholdsforVestingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SharesOutstandingRollForward" abstract="true" name="SharesOutstandingRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_RestrictedStockAndRestrictedStockUnitsMember" abstract="true" name="RestrictedStockAndRestrictedStockUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_PerformanceSharesUnitsAndRestrictedShareUnitsMember" abstract="true" name="PerformanceSharesUnitsAndRestrictedShareUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_PerformanceStockUnitsRestrictedStockUnitsAndEmployeeStockOptionMember" abstract="true" name="PerformanceStockUnitsRestrictedStockUnitsAndEmployeeStockOptionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_A2019StockCompensationPlanMember" abstract="true" name="A2019StockCompensationPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantDecrease" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantDecrease" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="spxc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAmortizationPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAmortizationPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityPeriodBasedOnHistoricalVolatility" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityPeriodBasedOnHistoricalVolatility" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateCalculationPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateCalculationPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_IndexTypeAxis" abstract="true" name="IndexTypeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="spxc_IndexTypeDomain" abstract="true" name="IndexTypeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_PeerGroupWithinSP600SmallCapCapitalGoodsIndexAndSP400MidCapCapitalGoodsIndexMember" abstract="true" name="PeerGroupWithinSP600SmallCapCapitalGoodsIndexAndSP400MidCapCapitalGoodsIndexMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsTotalShareholderReturnCorrelation" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsTotalShareholderReturnCorrelation" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="spxc_BlackScholesOptionPricingModelTable" abstract="true" name="BlackScholesOptionPricingModelTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="spxc_BlackScholesOptionPricingModelLineItems" abstract="true" name="BlackScholesOptionPricingModelLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_CommonStockInTreasuryAbstract" abstract="true" name="CommonStockInTreasuryAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_SensorsSoftwareIncMember" abstract="true" name="SensorsSoftwareIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_BusinessCombinationReductionInEstimatedLiability" abstract="false" name="BusinessCombinationReductionInEstimatedLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_KranzeTechnologySolutionsIncMember" abstract="true" name="KranzeTechnologySolutionsIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
