BRITISHSTANDARDBS7438:1991SpecificationforSteelandcopperalloywafercheckvalves,singledisk,spring-loadedtypeBS7438:1991ThisBritishStandard,havingbeenpreparedunderthedirectionofthePipingSystemsComponentsStandardsPolicyCommittee,waspublishedundertheauthorityoftheStandardsBoardandcomesintoeffecton31May1991©BSI08-1999ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferencePSE/7Draftforcomment90/75853DCISBN0580196143CommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedbythePipingSystemsComponentsStandardsPolicyCommittee(PSE/-)toTechnicalCommitteePSE/7,uponwhichthefollowingbodieswererepresented:AmalgamatedEngineeringUnionAssociationofBronzeandBrassFoundersAssociationofBuildingComponentManufacturersBritishChemicalEngineeringContractors’AssociationBritishFoundryAssociationBritishGasplcBritishMaritimeTechnologyBritishPlumbingFittingsManufacturers’AssociationBritishValveandActuatorManufacturers’AssociationCharteredInstitutionofBuildingServicesEngineersCopperDevelopmentAssociationDepartmentoftheEnvironment(PropertyServicesAgency)ElectricitySupplyIndustryinUnitedKingdomEnergyIndustriesCouncilEngineeringEquipmentandMaterialsUsers’AssociationGAMBICA(BEAMALtd.)HealthandSafetyExecutiveInstituteofBritishFoundrymenInstitutionofChemicalEngineersInstitutionofGasEngineersInstitutionofMechanicalEngineersInstitutionofWaterandEnvironmentalManagementLiquefiedPetroleumGasIndustryTechnicalAssociation(UK)PipelineIndustriesGuildSocietyofBritishGasIndustriesSocietyofBritishWaterIndustriesWaterCompanies’AssociationWaterServices’AssociationofEnglandandWalesWestMidlandsCBIAmendmentsissuedsincepublicationAmd.No.DateCommentswww.bzfxw.comBS7438:1991©BSI08-1999iContentsPageCommitteesresponsibleInsidefrontcoverForewordiiSection1.General1Scope12Definitions13Type14Nominalsizes15NominalandClasspressuredesignations16Pressure/temperatureratings17Dimensionsandtolerances2Section2.Designandoperation8Design49Operation4Section3.Materials10Optionalrequ...
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