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1、txt安全阀工作原理Thesafetyvalveisthepressurereliefvalve,whenthemeteringpumpoutsidepipeblocking,liquidthroughthesafetyvalvebacktotheoriginalbucket,doesnotcausethemeteringpumpoutsidepressurecontinuestorise,destructionofmeteringpumpandpipeline,thegeneralsafetyvalvesetpr
2、essureislessthanthemaximumworkingpressuremeteringpumporthesystemcanwithstandthepressureabout1KGF/CM2・Section1.OverviewThisseriesofsafetyvalvesarediaphragmvalves,whichareopenedonlywhenthefluidpressureisgreaterthantheirsetpressure,whichensuresthatnofluidflowsint
3、othedischargelineduetoinettiaorsiphonageduringthesuctionstrokeofthemeteringpump・Thevalvecanalsobeusedasanantisiphonvalveinoperationofthepump・Therearetwosideholes,thesafetyvalvehasnobottom,inthebottomofthevalvehasanarrowindicatingdirectionofflow.Thisseriesofrel
4、iefvalvesmaintainthepressureatthedischargeendofthemeteringpumptoensureaccuratemeteringbyoffsettingthesuctioninertia.andpreventingtheprocesspressurefromunderthesuctionpressureofthesystemsiphon.Inthedischargestrokeofthepump,thepressureactsonthediaphragmandliftsi
5、tawayfromthevalveseattoallowthefluidtopassthrough・Whenthedischargerateofthepumpisreducedto0(suctionstroke),thespringcausesthediaphragmtobereset,separatingtheoutletofthepumpandthelow-pressureliquidbetweenthevalves・Thisensuresaconstantpositivepressureonthepumpou
6、tletcheckvalve・Sectionsecond.InstallationNormally,ifthenaturalpressureinthepipelineislowerthantheminimumallowablepressureofthepumpoutlet,thesafetyvalveshallbeinstalledattheoutletpipeofthepump・Thepressureisusually50psi・Thereliefvalveshallbeinstalledinthedischar
7、gelineofthepumpandshallbeclosetothepump・Butforsomesystems,whenthedischargepipehassmallercaliberandlowerpiping,itmaybenecessarytoinstallthesafetyvalvenearthedosingpoint・Thefactorysettingpressureofthesafetyvalveis50psi(unlessotherwisestated)・Forfieldadjustments,
8、refertothe"reliefvalvepressuresetting"insectionthird〃・Apulsationdamperorsurgechamberisarrangedbetweenthepumpoutletandthesafetyvalvetoimprovetheperformanceofthesafetyvalve・Thepulsat
