BS 5157-1989 Steel gate (parallel slide) valves

BRITISHSTANDARDBS5157:1989SpecificationforSteelgate(parallelslide)valvesUDC621.646.5:669.14:001.4:620.1BS5157:1989ThisBritishStandard,havingbeenpreparedunderthedirectionofthePipingSystemsComponentsStandardsCommittee,waspublishedundertheauthorityoftheBoardofBSIandcomesintoeffecton31July1989©BSI04-1999FirstpublishedDecember1974FirstrevisionJuly1989ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferencePSE/7Draftforcomment87/72143DCISBN058017297XCommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedbythePipingSystemsComponentsStandardsCommittee(PSE/-)toTechnicalCommitteePSE/7,uponwhichthefollowingbodieswererepresented:AmalgamatedUnionofEngineeringWorkersAssociatedOfficesTechnicalCommitteeAssociationofBronzeandBrassFoundersAssociationofBuildingComponentManufacturersLtd.BritishChemicalEngineeringContractorsAssociationBritishCompressedGasesAssociationBritishFoundryAssociationBritishGasplcBritishMaritimeTechnologyBritishShipbuildersBritishValveandActuatorManufacturersAssociationLtd.CharteredInstitutionofBuildingServicesEngineersCopperDevelopmentAssociationCopperTubeFittingsManufacturers’AssociationDepartmentoftheEnvironment(PropertyServicesAgency)ElectricitySupplyIndustryinEnglandandWalesEnergyIndustriesCouncilEngineeringEquipmentandMaterialsUsers’AssociationGAMBICA(BEAMALtd.)HealthandSafetyExecutiveInstituteofBritishFoundrymenInstitutionofChemicalEngineersInstitutionofGasEngineersInstitutionofMechanicalEngineersInstitutionofWaterandEnvironmentalManagement(IWEM)SocietyofBritishGasIndustriesSteelCastingResearchandTradeAssociationWaterAuthorities’AssociationWaterCompanies’AssociationThefollowingbodywasalsorepresentedinthedraftingofthestandard,throughsub-committees:CombustionEngineeringAssociationAmendmentsissuedsincepublicationAmd.No.DateofissueComments©BSI04-1999iContentsPageCommitteesresponsibleInsidefrontcoverForewordiiiSection1.General1.1Scope11.2Definitions11.3Valvepatterns11.4Sizeranges11.5Nominalpressure(PN)andClassdesignation11.6Pressure/temperatureratings2Section2.Bodyends2.1Flangedbodyends42.2Butt-weldbodyends4Section3.Design3.1Bodies63.2By-pass63.3Bodytobonnetconnection63.4Stems63.5Operation63.6Bolting63.7Seats63.8Disks73.9Stemglands73.10Yokes73.11Endconnections7Section4.Materials4.1Pressurecontainingshell84.2Disksandbodyseats84.3Facingsfordisk,bodyseatandbody84.4Stems84.5Stemglands,bodysealsandgaskets84.6Bolting84.7Handwheel8Section5.Testing5.1Productionpressuretesting95.2Testcertificate95.3Manufacturer’scertificate9Section6.Marking6.1General106.2Bodymarkings106.3Identificationplatemarkings106.4Materialsymbols106.5Omissionofmarkings10Section7.Preparationforstorageandtransportation7.1General117.2Bodyends117.3Diskposition11©BSI04-1999PageAppendixAInformationtobesuppliedbypurchaser12AppendixBWeld-endpreparations13AppendixCApproximatediametersofbodyendports14AppendixDTypicalsteelgate(parallelslide)valves15Figure1—Weld-endpreparation13Figure2—Venturipatternwitheyelet15Figure3—Fullborepatternwithouteyelet16Figure4—Pressuresealandboltedbonnetassemblies17Table1—Pressure/temperatureratingsforSpecialClassbutt-weldendvalves:materialcarbonsteel2Table2—Pressure/temperatureratingsforSpecialClassbutt-weldendvalves:materialcarbonmolybdenumsteel2Table3—Pressure/temperatureratingsforSpecialClassbutt-weldendvalves:material1%chromium½%molybdenumsteeland1¼%chromium½%molybdenumsteel2Table4—Pressure/temperatureratingsforSpecialClassbutt-weldendvalves:material2¼%chromium1%molybdenumsteel3Table5—Face-to-facedimensionsandtolerancesforflangedendvalveswithraisedfaces4Table6—End-to-enddimensionsandtolerancesforvalveswithbodyendsflangedtoBS1560-3.1havingring-jointfaces5Table7—End-to-enddimensionsandtolerancesforbutt-weldendvalves5Table8—Draintappingsizes6Table9—Materialsforbody,bonnetandstuffingbox8Table10—Testdurations9Table11—Trimmaterialidentificationsymbols10Table12—Weld-endpreparation13Table13—Approximatediametersofbodyendports14PublicationsreferredtoInsidebackcover©BSI04-1999iiiForewordThisBritishStandardhasbeenpreparedunderthedirectionofthePipingSystemsComponentsStandardsCommitteeandconstitutestherevisionofBS5157:1974whichiswithdrawn.AtthetimeofpublicationofthisBritishStandard,nocorrespondinginternationalstandardexists.Incarryingoutthisrevision,thetypesandrangesofvalvescoveredhavebeenchanged.TheessentialdifferencesbetweenthisBritishStandardandBS5157:1974are:a)valveshavingbutt-weldendsareincludedforthefirsttime;b)valveshavingnominalpressure(PN)designationsarelimitedtoPN16,PN25andPN40inaccordancewithBS4504-3.1andinternationalphilosophyonpressuredesignation;c)valvesofClass400designationhavebeenomitted;d)tolerancesonface-to-faceandend-to-enddimensionshavebeenchangedtoobtainapracticalcompromisebetweenEuropeanandAmericanpracticesandthiswillbecomethepracticeforfutureBritishStandardsforvalves;e)thematerialsgivenforthebody,bonnetandstuffingboxhavebeenupdatedandarenowarequirement;f)productionpressuretestingrequ