Masoneilan调节阀计算选型步骤

1,3.1DefinitionandClassificationofValves定义和分类,Valve,Deviceswithmovablemechanismthatregulatetheflowoffluidsorgatesbyopening,closingorobstructingitspassages.,ControlValve,Regula-tor,Automatic,Automaticallycloseoropenbymeansofpressure,buoyancy,centrifuge,electricity,etc.,Receivenecessarypowertocloseoropenfromanauxiliaryenergysuchasairpress.,oilpress.,electricpoweretc.,Manual,Manuallyopenorclose,Receivenecessarypowertocloseoropenfromtheobjectfluidtobecontrolled(press.temp.,buoyancy,etc.),3.OutlineofValves阀概述,2,3.2FunctionofValves,3,Travelrequiredforvalvestroke,Travel,Responsecharacteristicsufficienttocontrolsystem,Response,Uponpowerfailure,Actiontosafesideofcontrolsystem,FailureAction,Power,Stiffness,Environment(Explosion,Dust&Waterproofetc.)Reliability,Durability,Maintainability,Others,Drivingforcetoovercomeunbalancedforce,friction&seatsurfacepressure,Stiffnessdesigntokeepstableactionforvaryingstemthrust,3.3FunctionofRequiredforActuators,4,3.4ComparisonofActuators,5,4.SelectionofControlValves,FluidConditions,Fluid,Flow,Sp.Gr.Inlet&OutletPress.,4.1ControlValveSelectionProcedure,MaterialSelection,Body,Packing,Trim,Gasket,7,ValveBodyPortion,ActuatorPortion,BonnetPortion,BodyS/A,4.1.1ControlValveStructure,8,SingleportDoubleportCageMulti-stage3-WaySplitbody,EccentricrotaryplugCamflexButterflyBall,SingleportCageMulti-stageSplitbody,4.1.2TypeofControlValve,9,:Goodm:Fair,s:NeedtoDiscussI:NotRecommanded,ValveTypeSelectionGuide,NoiseReduction,Start,LargeCapacity,LargeSize,Medium/SmallSize,SmallFlow,Butterfly,41000CageValve,21000SingleSeat,28000VariPak,41000Lo-DBSingle/DoubleCage,21700or21900,21000SH,NoisereductionbySmallJetsthroughmultiholes,NoisereductionbySmallJetsthroughmultiholes&StraigtenedFlow,Feature,NoisereductionbySmallJetsthroughmultiholes,AntiCavitation,Start,LargeCapacity,LargeSize,MediumSmallSize,SmallFlow,Butterfly,41000CageValve,21000SingleSeat,28000VariPak,Medium/SmalDP,LargeDP,LargeDP,28000-5VariLog,Medium/SmallDP,41000Lo-DBCage,41065,41075VRT,780007900041019,21700,ValveType,12,4.1.3MajorApplications,13,ASMEB16.34(Material:ASTMA105,A216WCB),Press.,Temp(C),class2500,class1500,class900,class300,class150,class600,4.1.4PressureRatings,(Mpa),14,4.1.5SeatLeakageStandard:ANSI/FCI70-2,15,CvValueCalculation(Flashing&Cavitationcheck)NoiseCalculationFlowVelocityCalculation(ConsiderHammerring,Vibration&Frictionduetohighvelocity),4.1.6CVSizingCalculation,16,Lowerlimitofvalvesizeshouldbe2sizesdown.Ex:Forlinesize10”,6”islowerlimitingsize.,4.1.8Trimsizeselectionguide,Formax.cond.=about8090%Fornormalcond.=about4080%Formin.cond.=about10%orhigher,CVopeningtravel:Foratmosvent,100%openingisallowable.Incasewheretherangeofmax.andmin.exceedcontrollableCvratio,multipleofcontrolvalvesshouldbeused.(splitrange)Whenlimitingmax.discharge.(Max.stoppertobeprovided),4.1.7LinesizevsValvesize,FLforvariousvalvetypesatvariousvalveopenings,Effectofpipereducers,Twophaseflow(Liquid-Vaporphase),Viscousliquids,4.1.9OtherCVSizingCalculations,18,MaterialStrength:Resistanttoworkingpress.andnodeformationEconomy:Lowcost,Machinability,FewdefectsTemperature:HighTemp.:ThermalStressLowTemp.:BrittlefractureCorrosionResistance：Corrosion,Erosion(Cavitationetc.),BodyMaterial:EquivalenttoorbetterthanLineMaterialTrimMaterial:Selecttoapplication,StainlessSteelasminimum.,4.2.1MaterialSelection,4.2.2ConsiderationforMaterialSelection,4.2MaterialSelection,19,4.2.1KindofMaterial,20,4.2.2KindofMaterial,21,4.2.3KindofMaterial,22,ValvePlug:StelliteSheath,StelliteSeatSeatRing,SeatRing：StelliteBore,StelliteSeatPlug,4.2.4StelliteCoating,23,PlugType,SeatringType,TeflonInsert,4.2.5SoftSeatTrim,4.2.6SelectionofBonnetType&GlandPackingMaterials,-196,-29,-100,230,425,650,300,2500,P#6610+P#316,Temp.(C),(class),Press.Rating,StandardBonnet,ExtensionBonnet,LongExtensionBonnet,P#6616CL+P#6710CL,P#4519M,WithLubricator,ExtensionBonnet,900,P#6315CLWithLubricator,P#6315CL,350,-50,4.2.7SelectionofBodyGasket,Liquid&Steam,Gas,30,20,10,-200,-50,200,650,0,300,30,20,10,-200,-50,20,650,0,300,Temp.(C),(MPa),FluidPress.,Non-std.rangecase-by-caseselection,T#1806,T#1806,T#1806-GR,Non-std.rangecase-by-caseselection,T#1806-GR,Temp.(C),26,SpringDiaphragm,SpringlessCylinder,SpringCylinder,PneumaticTypeActuators,4.3ActuatorSelection,27,4.3.1ComparisonofPneumaticActuators,28,POSITIONER,I/PTRANSDUCER,AIRSET,LOCKUPVALVE,TRANSFERVALVE,BOOSTERRELAY,SPEEDCONTROLLER,SOLENOIDVALVE,LIMITSWITCH,POSITIONTRANSMITTER,VOLUMETANK,LIMITSTOPPER,HANDWHEEL,QUICKEXHAUSTVALVE,4.4AccessoriesSelection,29,Improvementofresponse(ResponseLag,ActionSpeed)ImprovementofprecisioninvalveopeningSplitRange,Pneumatic/PneumaticType(P/PType)Electric/PneumaticType(E/PType)SmartType(SVI)Fieldbus,InputSignal:20100kPaInputSignal:420mAInput&OutputSignal:420mAInput&OutputSignal:Digital,30,Airsets(FilterRegulator),LockupValves,SolenoidValves,LimitSwitches,Settingsupplyairpressuretopositionerandotherdevices.Cleaningofinstrumentairbyfilter,Uponairsupplyfailure,holdairpressureinsideactuatorsoastoretainvalveopeningasis.,Capacityamplification：Improvementofactionspeed.Signalamplification：Exin：out=1:2input20-100kPaoutput40-200kPa,ApplicationForON/OFF-CapacityForControl-UniversalTypeExplosionClassElectricPowerSources（DC,AC-Hz),DirectionofactionContactCapacityExplosionproofClass,5.1CvCalculation,5.2NoiseCalculation,5.3NoisePrediction&Reduction,CVFlowCoefficientDefinition,ThenumberofU.S.gallonsperminuteofwaterat15Cwhichwillpassthroughagivenflowrestrictionwithapressuredropof1psi.,5.ControlValveSizing&NoisePrediction,5.4FlowCharacteristic,32,5.1CvCalculation,IEC60534-2-1FlowCapacity-SizingEquationforFluidFlowunderInstalledConditions(1998-09),TurbulentFlow&Non-TurbulentFlow(Rev10,000)CriticalFlow(Cavitation&Flashing)&Sub-criticalFlow,LiquidPressureRecoveryFactor,FL,f,P,P,FL,D,D,=,34,Flashing,TurbulentFlow,FullCavitation,IncipientCavitation,Pressurerecoveryphenomena,35,5.2NoiseCalculation,Liquid,IEC534-8-4PredictionofNoiseGeneratedbyHydrodynamicFlow(1994-05),FlashingNoise-NoCalculationMethod,Gas&Steam,IEC60534-8-3ControlValveAerodynamicNoisePredictionMethod(2000-07),ValveOutletVelocityM00.3Mach:StandardtrimM00.2Mach:Noise-reducingTrimDownstreamPipeVelocityM20.8Mach,5.3NoisePrediction&Reduction,37,5.3.1HydrodynamicNoise,38,CavitationControl,SelectaLargeFLvalveMakevalvepressuredropsmall,EvaluatethelocationofvalvetobeinstalledInstallrestrictor,Lightcavitation/Flashing,SelectarigidvalvetypeSelectanti-erosionmaterialsfortrim,5.3.2HydrodynamicNoisePreventiveMeasures,39,Selectionofcavitationcontroltypevalve,FluidsjettedthroughMultiple-orificecageimpingeeachotherandthefluidenergytobeconsumed(41000LO-DBTypeValve),Fluid,5.3.10Rev0,inlet,Bubblesimpingeandcollapse,Multiple-orificecage,outlet,5.3.3HydrodynamicNoisePreventiveMeasures,40,SelectionofAnti-Cavitationvalve,UseofMultiple-stagepressurereducingvalvetopreventcavitation78000,7900041019TypeValve,5.3.4HydrodynamicNoisePreventiveMeasures,Theefficiencyofconversionbetweenmechanicalandacousticalpowerisreduced.Shiftoftheacousticenergytothehighfrequencyregions.Increaseofnoisereductionratebypipewall.Outsidetherangeofhearingfrequency.Reducetheshock-eddybythemutualinteractionofthefluidjets.,5.3.5AerodynamicNoiseAerodynamicNoiseReductionsSourceTreatment,42,5.3.6LowNoiseTrim,SingleStageMultiFlow,SingleFlowPath,Multistage,Multipath,Multistage,43,5.3.7ValveOutlet,VelocityNoise,DecreasepressureratioofvalveDecreasedownstreamvelocityofvalvePropagationprotectionofgeneratednoiseNoisereductiongeneratedbyrestricteritself,LO-DBcartridge,UseofLO-DBrestricter,F.C.bytrim,F.C.tovariationofactuatoractionbypositioner,F.C.inherenttovalvetypedesign,(Miniflowvalve,LO-DBvalve,Anti-Cavitationvalveetc.),Single,DoubleVport,Cage,5.4FlowCharacteristic(F.C.),GeneralSelectionGuideofFlowCharacteristic,ConstantValveDP,ValveDPislargerthen2/3ofsystemDP(Ex.PumpMinimumFlowValve),ValveDPdecreaseswhenflowrateincreses(Ex.BoilerFeedwaterValve),FlowControl,ValveCharact.,Linear,Linear,EQ%,EQ%,47,Travel(%),RatedCv(%),Eq%,Linear,Eq%,Linear,E/q%-Linear,Universal,Semi-Throttle,FlowCharacteristic,Linear,Equalpercentage,Travel(%),Flow(%),InstalledFlowCharacteristic,6.MaintenanceofControlValve,50,6.1DailyCheckupItems,51,2.Leakagefromglandpacking,Checktighteningallowance,1.Corrosion,deformationofbodystuds&nuts,Lubricatorcorrosionofscrews,guantityofgrease,3.corrosion,deformationofglandstuds&nuts,6.2DailyVisualCheckupPointsofBody,Leakagefromgasket,52,Size:#9,#11,#13,Size:#15,#18,10.VentelbowProtectionagainstrainwater,7.replacementtostainlesssteelcasebolts&nuts(anti-corrosion,easymaintenance),5.DeteriorationofdiaphragmCheckthediaphragmexposedfromthecasebytouchingorvisually.Also,considerthereplacementcycle.,11.Deteriorationofindicaterscale,DirectActuator,ReverseActuator,6.Corrosionofupper&lowercase,8.CorrosionofyokeEspeciallyincaseofglandleak,6.3DailyVisualCheckupPointsofActuator,53,6.4.1FailureMechanismAssumptionTable,Body,Bonnet,Parts,Function,Pressureretainingpartwithoutfailureunderthespecifiedcondition,FailureMade,Erosion,Corrosion,FatigueCrack,Shortageofwallthicknessbyabrasionontheinterior,Crackontheinterior,FailurePhenomenon,Cause,FailureMechanism,FluidScaleVelocityDP,FluidMaterial,Press.VariationTemp.Variation,Highvelocityfluid,Jetfromseat,Failuremechanism,Erosionontheinterior,(FluidLeak),Fluid,Erosionontheinterior,Internalpress.stressvariationThermalstress.variation,Accumlatedstrain,Fatiguecrack,FluidMaterial,Pressureretainingpartwithoutfailureunderthespecifiedcondition,Corrosion,FatigueCrack,Shortageofwallthicknessbyabrasionontheinterior,Crackontheinterior,Corrosionontheinterior,FluidMaterial,Press.VariationTemp.Variation,Material,(FluidLeak),(FluidLeak),Erosionontheinterior,(FluidLeak),Internalpress.stressvariationThermalstress.variation,Accumlatedstrain,(FluidLeak),Fatiguecrack,54,6.4.2FailureMechanismAssumptionTable,Plug,Galling,Erosionontheseat,guide,contour,Gallingattheguide,Scale,Cavitation,Erosionontheseat,guide,contour,Seatleak/vibration/poorcontrollability,Smoothcontrol,Sticking,Nomovementbygalling,