双关双断旋塞阀 说明书.pdf

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1、www.3ZValve.comTWINSLIPPLUGVALVEDoubleBlock&BleedCriticalDropTightSealingForuseinoil,RefinedProducts&PetrochemicalApplication TableofContentsPage*Design----------------------------3*Operation------------------------4*DTRBleedSystem-----------5*ExplodedView-----------------6*Standards------

2、------------------7*Cv&TorqueData-------------8*BleedSystem----------9,10,11*Application--------------------12*Operator&LockingDevices-----------14*Dimension-------------15,16,17*HowtoOrder------------------182 DesignFeatures●ZeroLeakageValveselectionisveryimportantinthepetroleumindustry.A

3、nincorrectvalveselectioncausesthedecreaseofincome,thepollutionofproduct,andtheincreaseofproductlinemaintenancecost.,Multiproductsystemvalvesshouldbedesignedtowithstandfrequentcyclinganddroptightsealshutoffupstreamanddownasrequired.Thedoubleblockandbleedwasdevelopedforsatisfyingthedemandofm

4、eteringstation,tankfarms,marineloadingdocksandblendingplants,etc.●NoAbrasionThe3ZTwinSlip(D.B.B)plugvalvecandocompleteisolationwithoutleakageinadesignpressure.Thedesignofvalveissuchthatthesealsdonotcomeincontactwiththevalvebodyatanytimeduringopeningorclosingofthevalve.Onlyatthelastmomentof

5、closingdothesealscomeincontactwiththebody,theforceconsistsofonlyapressureforce.Thispressureforceisperpendiculartotheseatingareaandashearingforceistherebyeliminated.WhenthevalveisIntheopeningposition,thesealareseparatedfromthebody,andmaintainedatthisstateduringplugrotation.Thiseliminatesabr

6、asionforcesfromthesealsandextendsseallife.●Doubleblock&bleedWiththe3ZTwinSlip(D.B.B)plugvalve,thereisanup-streamanddown-streamseal,andbleedpointinbetween.Thisonevalvesubstitutesfortwovalves,andonespool(drain).Thespoolsendsanyleakingfluidfromthevalvetothetank.Thebleedsystemonthe3Zdoublebloc

7、kandbleedisinstalledforprovingzeroleakage.Thisensurethatifanyleakageweretooccuritwouldbeeliminatedviathebleed.Thisguaranteescompleteandtotalproductsegregation.●HighIntegrityShutoffWhenthevalveisclosedtheelastomericsealringsareforcedagainsttheseatseachsideofthe