~~~~~STD-MSSSP-7L-ENGLL777M5770b400500774L75MSSSP-71-1997GrayIronSwingCheckValves,FlangedandThreadedEndsStandardPracticeDevelopedandApprovedbytheManufacturersStandardizationSocietyoftheValveandFittingsIndustry,Inc.127ParkStreet,N.E.Vienna,Virginia22180(703)281-6613COPYRIGHTManufacturersStandardizationSocietyoftheValveandFittingsLicensedbyInformationHandlingServicesCOPYRIGHTManufacturersStandardizationSocietyoftheValveandFittingsLicensedbyInformationHandlingServicesMSSSTANDARDPRACTICESP-71AnMSSStandardPracticeisintendedasabasisforcommonpracticebythemanufacturer,theuser,andthegeneralpublic.TheexistenceofanMSSStandardPracticedoesnotinitselfprecludedthemanufacture,sale,oruseofproductsnotconformingtotheStandardPractice.Mandatoryconformanceisestablishedonlybyreferenceinacode,specification,salescontract,orpubliclaw,asapplicable.ISubstantivechangesinthis1997editionare"flagged"byparallelbarsasshownonthemarginsofthis.paragraph.Thespecificdetailofthechangemaybedeterminedbycomparingthematerialflaggedwiththatinthepreviousedition.U.S.customaryunitsinthisSParethestandard;themetricunitsareforreferenceonly.IUnlessotherwisespecificallynotedinthisMSSSP,anystandardreferredtohereinisidentifiedbythedateofissuethatwasapplicabletothereferencedstandard(s)atthedateofissueofthisMSSSP.(SeeAnnexA.)InthisStandardPracticeallnotes,annexes,andfiguresareconstruedtobeessentialtotheunderstandingofthemessageofthestandard,andareconsideredpartofthetextunlessnotedas"supplemental".Allfootnotesappearinginthisdocumentarecon-struedas"supplemental"wheretheirinformationdoesnotmodifythetexttowhichtheyrefer.INon-toleranceddimensionsinthisStandardPracticearenominal,and,unlessspecified,shallbeconsidered"forreferenceonly".IOriginallyApprovedFebruary,1970Anypartofthisstandardmaybequoted.Creditlinesshouldread'ExtractedfromMSSSP-71,1997,withpermissionofthepublisher,theManufacturersStandardizationSociety.'Reproductionprohibitedundercopy-rightconventionunlesswrittenpermissionisgrantedbytheManufacturersStandardizationS...