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:100225855(2007)0620034204:(1979-),,,,1,2(11,150046;21,157000),,,;;;:TH134:AThecalculationofcharacteristicscurveanddifferentialpressureundereachopeningonboilerfeedwatercontrolvalveQIUHong2jun1ZHANGNai2bo2(1.HarbinHBVValveCompanyLtd.,Harbin150046,China;2.HeilongjiangNorthValveCompanyLtdLiability,MudanJiang157000,China)Abstract:Thisarticleintroducesthatduringthecharacteristicscurvedesigning,howtousethefor2mulastocalculatethedifferentialpressureofeachopeningandhowtoaddvalveminimumthrottlingareatototalthrottlingareamakingthecharacteristicscurvemorereasonable.Keywords:boiler;controlvalve,differentialpressurecalculation;characteristicscurve.1,,,,,,,,,,,,,,,,2,,(),,(1),,1dQiQmax=df(lL)C(1)l=0,Qi=QNl=L,Qi=Qmax(1),4320076QmaxQNQiQmax=CL0d(lL)1Qmax(Qmax-QN)=CR=QmaxQN,C=1-1Rl=l,Qi=Qil=0,Qi=QN(1),Qi-QNQmax=lLC(2)C(2),QiQmax=1R[1+(R-1)lL](3)Qi=Qmax1R[1+(R-1)lL](4)Qmax,t/hQi,t/hQN,t/hRl,mL,m(3),,,,Qi=5104iFipi(5)Qmax=5104maxFmaxpmaxmax(6)QiQmax=iFipimaxFmaxpmaxmax(7)imaxpi,MPapmax,MPaFi,m2Fmax,m2imax,,,i=max,F1=iFiF=maxFmax,(7)QiQmax=F1piFpmax=1R[1+(R+1)lL]F1=FR[1+(R+1)lL]pmaxpi(8)F1,m2F,m2,pipmax,,(8)pi=pmax,(8)()(8),pmax,F1(6),R,l/L,pi3,,,,,,,311,,(2),pi=p1-p2-p3(9)p1,MPap2,MPap3,MPap3=w22g10(10)w=Qi0136F2i(11)Qi,t/h()5320076g(g=918m/s2),m/s2,kg/m3F2,m2(11)(10)p3=Qi22514F22(12)p=p1-p2,pi=p-Qi22514F22(13)(13),(13),,2312,,,,,,,,,,(3),,,,,,pipi=p-p3(14)345p,MPap=p3-p4p3,MPap3Qi,MPap4Qi,MPa,,p3,6320076,,p3,pi,,,pi=0115012MPa313,,,(4),,,pi,pi=ps-(pa-pb)QiQmax-QN(15)ps=pa+(pa-pb)QNQmax-QN(16)ps,MPapa,MPapb,MPa(14),,,,314,,R=Qmax1QN1papb(17)Qmax1,t/hQN1,t/h(17),,,05,,,,,,,,,,,R=3050,30%670t/h,,200t/h,,,,,,,R=10204,,,5l/L=0,F0=1RFmax,,l=0,,,,F0=1RFmax+F,,,,,l=0F0=1RFmax+F,5,,,,5,,,,,,,,,11M1:,19991(:2007107124)7320076