流量系数计算（英文）

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1、VSSTR-9/05VALVESIZING&SELECTIONTECHNICALREFERENCETABLEOFCONTENTSIntroductionValveFlowTerminologyTheSizingProcessOperatingConditionsFluidPropertiesRangeabilityCvandFlowSizingFormulasCVFormulasforLiquidFlowCVFormulasforVaporFlowCVFormulasforTwoPhaseFlowFlowVelocityFormulasFlo

2、wVelocityforLiquidFlowFlowVelocityforVaporFlowNomenclatureConversiontoCgandCsSeatLeakageActuatorSizing∆PTablesApplicationGuideforCavitation,FlashingandCompressibleFlowServicesLiquidFlowCavitationCavitationDefinitionCavitationCountermeasuresApplicationofWarrenTrimsinCavitati

3、onServiceCavitationAvoidanceCavitationTolerantCavitationContainmentCavitationPreventionTheCavitationPhenomenaFluidandPressureProfilesChokedFlowandIncipientCavitationCavitationDamageFlashingFlashingDefinitionFlashingCountermeasuresBodyMaterialTrimSelectionApplicationofWarren

4、ValvesinFlashingServiceBodyMaterial:TrimSelectionTheFlashingPhenomenaLiquidFlowVelocity-BodyMaterialCompressibleFlowNoiseCompressibleFlowNoiseDiscussionCompressibleFlowNoiseCountermeasuresApplicationofWarrenTrimsinCompressibleFlowApplicationsStandardTrims:MultipleOrificeTri

5、msCompressibleFlowVelocityLimits:TwoStageTrimsandBackpressureOrifices:TheCompressibleFlowNoisePhenomenaTABLESTrimRangeabilityTable1FluidPropertiesTable2FLFactorsTable3FlangedBodyInletandOutletDiametersTable4AllowableSeatLeakageClassesTable5LiquidFlowVelocityLimitsTable6FIGU

6、RESCavitation2INTRODUCTIONAControlValveperformsaspecialtask,controllingtheflowoffluidssoaprocessvariablesuchasfluidpressure,fluidlevelortemperaturecanbecontrolled.Inadditiontocontrollingtheflow,acontrolvalvemaybeusedtoshutoffflow.Acontrolvalvemaybedefinedasavalvewithapowere

7、dactuatorthatrespondstoanexternalsignal.Thesignalusuallycomesfromacontroller.Thecontrollerandvalvetogetherformabasiccontrolloop.Thecontrolvalveisseldomfullopenorclosedbutinanintermediatepositioncontrollingtheflowoffluidthroughthevalve.Inthisdynamicservicecondition,thevalvem

8、ustwithstandtheerosiveeffectsoftheflowingfluidwhilemaintaininganaccuratepositionto