BRITISHSTANDARDBS5155:1984IncorporatingAmendmentNos.1and2SpecificationforButterflyvalvesUDC621.646.25BS5155:1984ThisBritishStandard,havingbeenpreparedunderthedirectionoftheMechanicalEngineeringStandardsCommittee,waspublishedundertheauthorityoftheBoardofBSIandcomesintoeffecton31July1984©BSI12-1998FirstpublishedNovember1974FirstrevisionJuly1984ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceMEE/191Draftforcomment81/72473DCISBN0580138003CommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedbytheMechanicalEngineeringStandardsCommittee(MEE/-)toTechnicalCommitteeMEE/191uponwhichthefollowingbodieswererepresented:AmalgamatedUnionofEngineeringWorkersAssociatedOfficesTechnicalCommitteeAssociationofBronzeandBrassFoundersAssociationofHydraulicEquipmentManufacturersBritishChemicalEngineeringContractors’AssociationBritishCompressedGasesAssociationBritishGasCorporationBritishShipResearchAssociationBritishShipbuildersBritishValveManufacturers’AssociationLtd.CopperDevelopmentAssociationCopperTubeFittingsManufacturers’AssociationCouncilofIronfoundryAssociationsElectricitySupplyIndustryinEnglandandWalesEnergyIndustriesCouncilEngineeringEquipmentandMaterialsUsers’AssociationGAMBICAGeneralCouncilofBritishShippingGreaterLondonCouncilHealthandSafetyExecutiveInstituteofBritishFoundrymenInstitutionofChemicalEngineersInstitutionofGasEngineersInstitutionofMechanicalEngineersInstitutionofWaterEngineersandScientistsNationalCoalBoardSocietyofBritishGasIndustriesSTCWaterRegulationsandFittingsSchemeSteelCastingResearchandTradeAssociationWaterCompaniesAssociationCooptedmembersThefollowingbodywasalsorepresentedinthedraftingofthestandard:InstitutionofCivilEngineersAmendmentsissuedsincepublicationAmd.No.DateofissueComments5919March19886990May1992Indicatedbyasidelineinthemarginwww.bzfxw.comBS5155:1984©BSI12-1998iContentsPageCommitteesresponsibleInsidefrontcoverForewordiiiSection1.General1Scope12Definitions13Types14Nominalsizerange25N...
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