API 594-1997 Check Valves：Wafer,Wafer-Lug,and Double Flanged Type

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1、CheckValves:Wafer,Wafer-Lug,andDoubleFlangedTypeAPISTANDARD594FIFTHEDITION,NOVEMBER1997COPYRIGHT2000AmericanPetroleumInstituteInformationHandlingServices,2000COPYRIGHT2000AmericanPetroleumInstituteInformationHandlingServices,2000CheckValves:Wafer,Wafer-Lug,and

2、DoubleFlangedTypeManufacturing,DistributionandMarketingDepartmentAPISTANDARD594FIFTHEDITION,NOVEMBER1997COPYRIGHT2000AmericanPetroleumInstituteInformationHandlingServices,2000SPECIALNOTESAPIpublicationsnecessarilyaddressproblemsofageneralnature.Withrespecttopa

3、rtic-ularcircumstances,local,state,andfederallawsandregulationsshouldbereviewed.APIisnotundertakingtomeetthedutiesofemployers,manufacturers,orsupplierstowarnandproperlytrainandequiptheiremployees,andothersexposed,concerninghealthandsafetyrisksandprecautions,no

4、rundertakingtheirobligationsunderlocal,state,orfed-erallaws.Informationconcerningsafetyandhealthrisksandproperprecautionswithrespecttopar-ticularmaterialsandconditionsshouldbeobtainedfromtheemployer,themanufacturerorsupplierofthatmaterial,orthematerialsafetyda

5、tasheet.NothingcontainedinanyAPIpublicationistobeconstruedasgrantinganyright,byimplicationorotherwise,forthemanufacture,sale,oruseofanymethod,apparatus,orprod-uctcoveredbyletterspatent.Neithershouldanythingcontainedinthepublicationbecon-struedasinsuringanyonea

6、gainstliabilityforinfringementofletterspatent.Generally,APIstandardsarereviewedandrevised,reaffirmed,orwithdrawnatleasteveryfiveyears.Sometimesaone-timeextensionofuptotwoyearswillbeaddedtothisreviewcycle.Thispublicationwillnolongerbeineffectfiveyearsafteritspubli

7、cationdateasanoperativeAPIstandardor,whereanextensionhasbeengranted,uponrepublication.StatusofthepublicationcanbeascertainedfromtheAPIAuthoringDepartment[telephone(202)682-8000].AcatalogofAPIpublicationsandmaterialsispublishedannuallyandupdatedquarterlybyAPI,1

8、220LStreet,N.W.,Washington,D.C.20005.ThisdocumentwasproducedunderAPIstandardizationproceduresthatensureappropri-atenotificationandparticipationinthedevelopmentalprocessandisdesignat