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1、Evaluation Warning: The document was created with Spire.Doc for .NET.阀门流量计计算方法法如何使用流流量系数数Howw too usse CCv阀门流流量系数数(Cvv)是表表示阀门门通过流流体能力力的数值值。Cvv越大，在在给定压压降下阀阀门能够够通过的的流体就就越多。CCv值11表示当当通过压压降为11 PSSI时，阀阀门每分分钟流过过1加仑仑15oC的水水。Cvv值3550表示示当通过过压降为为1 PPSI时时，阀门门每分钟钟流过3350加加仑155oC的水水。Vallve coeeffiicieent (Cvv) ii
2、s aa nuumbeer wwhicch rreprreseentss a vallves aabillityy too paass floow. Thee biiggeer tthe Cv, thhe mmoree fllow a vvalvve ccan passs wwithh a givven preessuure droop. A CCv oof 11 meeanss a vallve willl ppasss 1 galllonn peer mminuute (gppm) of 60ooF wwateer wwithh a preessuure droop (dp) off 1
3、PSII accrosss tthe vallve. A Cv of 3500 meeanss a vallve willl ppasss 3550 ggpm of 60ooF wwateer wwithh a dp of 1 PPSI.公式1FOORMUULA 1流速：磅/小小时(蒸蒸汽或水水)FLOOW RRATEE LBBS/HHR (Steeam or Watter)在此：Whheree:dp=压降，单位位：PSSIdp=presssuree drrop in PSIIF=流速，单位位：磅/小时F=flow ratte iin llbs./hrr.=比容积的平平方根，单单位：立立方英尺
4、尺/磅(阀门下下游)=squarre rroott off a speeciffic vollumee inn ftt3/lbb.(ddownnstrreamm off vaalvee)公式2FOORMUULA 2流速：加伦/分钟(水或其其它液体体)FLOOW RRATEE GPPM (Watter or othher liqquidds)在此：Whheree:dp=压降，单位位：PSSIdp=presssuree drrop in PSIISg=比重Sg=speciificc grraviityQ=流速，单位位：加伦伦/分钟钟Q=flow ratte iin GGPM局限性LIIMITTAT
5、IIONSS上列公公式在下下列条件件下无效效：Aboove forrmullas aree noot vvaliid uundeer tthe folllowwingg coondiitioons:a. 对于可压缩缩性流体体，如果果压降超超过进口口压力的的一半。For compressible fluids, where pressure drop exceeds half the inlet pressure. b. 对于不可压压缩性流流体，如如果压降降产生空空穴或闪闪蒸。FFor nonn-coomprresssiblle ffluiids, whheree prresssuree drr
6、op cauusess caavittatiion or flaashiing. c. 对于双相流流体，如如蒸汽-水混合合流体。For dual-phase flow such as steam-water mixtures. 例子EXAAMPLLE1. 通过DN3350, 压力力等级CClasss 9900的的压力密密封闸阀阀，水温温4000oF，压压力为115000 PSSIG，流流速为55,0000,0000磅磅/小时时的压降降是多少少？Whhat is thee prresssuree drrop thrrouggh aa 144 CClasss 9900 preessuure sea
7、al ggatee vaalvee wiith 4000oF wwateer, 15000 PPSIGG, aand 5,0000,0000 lbbs/hhr ffloww raate?解：采采用公式式1Sooluttionn: UUse forrmulla 11. F=5,0000,0000=0.1377 (从从水温为为4000oF的表表中得到到)=0.1377 (ffromm chhartt foor wwateer aat 4400ooF)Cv=9150 (来自自本页)Cv=9150 (frrom pagge 226)2. DN3500 x DN3300 x DDN3550，压压力等级级
8、Claass 9000缩喉管管压力密密封闸阀阀，其它它条件与与例1相相同，求求压降。What is the pressure drop through a 14x12x14 Class 900 Venturi pressure seal gate valve with the same conditions as example 1.解：采用公式1Solution: Use formula 1.Cv = 6285 (来自本页)Cv = 6285 (from page 26)3. 温度9000oF, 压力112000 PSSI，流流速5000,0000磅磅/小时时的蒸汽汽应用中中压降小小于5 P
9、SII的压力力等级CClasss 225000闸阀的的最小通通径是多多少？WWhatt iss thhe ssmalllesst CClasss 225000 gaate vallve thaat wwilll haave lesss tthann a 5 PPSI preessuure droop iin 9900ooF, 12000 PPSI steeam serrvicce aat aa fllow ratte oof 5500,0000 lbbs/hrr?解：采用公公式1SSoluutioon: Usee foormuula 1. F=500,0000=0.7855 (来来自9000o
10、F, 12000 PPSIGG蒸汽表表)=0.7855 (ffromm chhartt foor ssteaam aat 9900ooF, 12000 PPSIGG)= 2.224最接近近的、较较大的CCv是DDN2550压力力等级CClasss 225000闸阀，其其Cv是是31330。这这里是压压降小于于5 PPSIGG的最小小的阀门门。Thee clloseest higgherr Cvv iss a 10 Cllasss 25500 gatte wwithh a Cv of 31330. Thiis iis tthe smaalleest vallve witth aa prresss
11、uree drrop lesss tthann 5 PSIIG.水和蒸汽的的备选特特性Seelecctedd Prropeertiies of Watter andd Stteamm水的(下游游)Foor WWateer (Dowwnsttreaam)所有压力等等级AlllPrresssurees温度(oFF)Teempeeratturee (ooF)1002003004005006000.12770.12990.13220.13770.14330.1544蒸汽的(下下游)FFor Steeam (Doownsstreeam)压力PSIIG PPresssurrePSSIG温度(oFF)Tee
12、mpeeratturee (ooF)Sat50060070080090010001100100200030004000500060007000800090001000011100012000133001140001600018800220000250003000044000050000600001.9711.4661.2211.0600.95500.86550.88010.74770.770100.66620.62880.55980.557000.54452.2011.6111.3301.1100.97790.89552.3211.6881.3381.1911.0660.996000.8880
13、0.81550.775900.71100.67000.662900.59900.55992.4411.7771.4461.2611.1221.0020.94110.887500.82210.77330.773200.69950.66220.663300.5880.5540.5000.4110.3110.1170.1600.1662.5411.8551.5521.3321.1811.0880.999400.92260.87000.881600.78810.74550.771000.68830.6300.5990.5550.4800.4220.3320.2400.1992.6411.9551.66
14、01.3811.2331.1131.0400.97720.91440.886500.82230.78550.775200.72230.6700.6330.5590.5200.4660.3380.3200.2882.7422.0001.6651.4311.2881.1171.0811.0110.995500.91170.87220.881300.78890.75220.7700.6600.6220.5550.4900.4220.3360.322.8422.0771.7711.4711.3331.2221.1211.0550.9990.9400.9000.8860.8300.7990.7740.6
15、900.6550.5580.5200.4440.3390.35阀座端口流流速计算算Callcullatiing Seaat PPortt Veeloccityy下列公公式可以以用来计计算任何何阀门的的阀座流流速：Thhe ffolllowiing forrmullas cann bee ussed to callcullatee seeat porrtveeloccityy inn anny vvalvve:流量(磅/小时): 流流速: (英尺尺/秒)= F()225AFlow (lbbs/hhr): veel: (fpps) = F()225A流量(加仑仑/分钟钟): 流速: (英英尺/秒秒
16、)= 0.32QAFlow (GPPM): veel: (fpps) = 0.32QA在此：Whheree:F=流量(磅/小时)F=flow (lbbs/hhr)=比容积的平平方根=squarre rroott off sppeciificc voolummeA=阀座端口面面积 (英寸22)A=seat porrt aareaa (iin2)Q=流量 (加加仑/分分钟)Q=flow (gppm)例：DDN3000型号号588809 (压力力等级CClasss 9900)止回阀阀，流体体介质为为温度5500 oF，压压力2000 PPSIGG的蒸汽汽，流速速为900,0000磅/小时，求求阀座端
17、端口的流流速？ Exaamplle:Whhat is thee seeat porrt vveloocitty iin aa 122 FFiguure 588809 (Cllasss 9000) cheeck vallve witth aa fllow ratte oof 990,0000 lbss/hrr off stteamm att 5000 ooF aand 2000 PSSIG?解：从从蒸汽表表得为11.611，从阀阀座端口口面积表表A得阀阀座端口口面积为为78.5英寸寸2。Ansswerr:Froom tthe steeam tabbless iss 1.61, annd ffro
18、mm thhe sseatt poort areea ttablle AA iss 788.5 in22.流速: (英尺/秒)= F()225A=90,000 (1.61)225 (78.5)= 1188.8 英尺/秒Vel (fpss) = F()225A=90,000 (1.61)225 (78.5)= 1188.8 fpss例：DDN3000型号号1800 (压压力等级级1500)旋启启式止回回阀，流流体介质质为温度度5000oF，压压力2000 PPSIGG的蒸汽汽，流速速为900,0000磅/小时，求求阀座端端口流速速？Exxampple:WWhatt iss thhe sseatt
19、 poort vellociity in a 112 Figguree 1880 (Claass 1500) SSwinng CChecck VValvve wwithh a floow rratee off 900,0000 llbs/hr of steeam at 5000oF aand 2000 PSSIG?解：查查表得为为1.661，AA为 1113.1英寸寸3.Ansswerr:Froom tthe tabbless iss 1.61 andd A is 1133.1 in33.流速: (英尺/秒)= F()225A=90,000 (1.61)225 (113.1)= 82.5英尺尺
20、/秒Vel (fpss) = F()225A=90,000 (1.61)225 (113.1)= 82.5 ffps局限性LIIMITTATIIONSS流速公公式在下下列条件件下无效效：VVeloocitty fformmulaas aare nott vaalidd unnderr thhe ffolllowiing conndittionns:a. 对于可压缩缩性流体体，如果果压降超超过进口口压力的的一半。For compressible fluids, where pressure drop exceeds half the inlet pressure. b. 对于不可压压缩性流流体，
21、如如果压降降产生空空穴或闪闪蒸。FFor nonn-coomprresssiblle ffluiids, whheree prresssuree drrop cauusess caavittatiion or flaashiing. c. 对于双相流流体，如如蒸汽-水混合合流体。For dual-phase flow such as steam-water mixtures. 注意NOTTE在确定定止回阀阀通径时时，最适适宜的工工作流速速应该位位于这些些范围内内：Wheen ddeteermiininng ssiziing forr chheckk vaalvees, thee opptimm
22、um opeerattingg veeloccitiies shoouldd faall witthinn thhesee raangees:BB旋启式式止回阀阀：555 至1115或或1355至2440BBB截止止止回阀：40 至1220 PPS提升升式阀瓣瓣止回阀阀：555至2000 PPSY形形止回阀阀：1448 至至2000 BBB Swwingg Chheckk Vaalvees - 555 too 1115 oor 1135 to 2400BB Stoop CChecck VValvves - 440 tto 1120 PS TTiltt Diisc Cheeck Vallvess
23、 - 55 to 2000 PSS Sttop Cheeck Vallvess - 40 to 1800PS Y- Stoop CChecck VValvves - 1148 to 2200 阀座端口面面积“AA”(英英寸2)适用于于螺栓阀阀帽阀门门SEAAT PPORTT ARREA A FOOR BBOLTTEDBBONNNET VALLVESS (iin2)阀门通径VValvve SSizee压力等级PPresssurre CClasss150300600900150011/22221/234681012214166182002430036 1.83.14.97.1122.6228.33
24、50.3788.51113.11337.991822.72233.72991.004244.56671.99669.001.83.14.97.1122.6228.3350.3788.51113.11337.991822.72227.02883.554244.56672.09442.001.83.17.1112.6288.3448.7774.71008.441300.21170.92113.882611.63380.15990.998511.21.83.14.96.5111.8226.0044.2711.01100.01117.991.52.84.06.0100.3222.7738.5600.0
25、884.551011.6阀座端口面面积(英英寸2)适用于于压力密密封闸阀阀，截止止阀，提提升式阀阀瓣止回回阀SEEAT PORRT AAREAA FOOR PPRESSSURRE SSEALL GAATE,GLOOBE, TIILT DISSC CCHECCK VVALVVES (inn2)阀门通径VValvve SSizee压力等级PPresssurre CClasss6009001500250021/233468101221416618200245.45.49.6233.2339.9961.0888.71733.83100.2555.95.9100.3221.7737.7588.4880.
26、5597.21225.221566.71198.02887.333.34.98.3188.9331.9948.7699.0882.551088.41137.91770.992477.52.43.65.9122.6221.7734.5477.2558.2276.6977.21117.91770.99阀座端口面面积(英英寸2)适用于于压力密密封Y形形截止阀阀SEAAT PPORTT ARREA FORR PRRESSSUREE SEEAL Y-GGLOBBEVAALVEES (in22)阀门通径VValvve SSizee压力等级PPresssurre CClasss900150025008101
27、2214166182002439.9661.9986.6866.61135.41355.41198.13002.6639.9661.9986.6866.61135.41335.441988.13302.627.2442.8860.1866.6886.661355.41135.41998.11螺栓阀帽闸闸阀全开开状态下下的流量量系数CCvBoolteed BBonnnetGGatee Vaalvees FFULLL OPPEN Cv阀门通径VValvve SSizee压力等级PPresssurre CClasss150300600900150011/22221/23456810122141661
28、820024300361653007499071101330022090031110577208893551333501162775211560028772033576605221655862235112955001653007499071101330031110577208893551333501162775211560027889033484405110500847765112588251653007499071101330031110555408849551288001153770299170026277032214004677107755330111425506550122202855
29、0500257785001144751139110138277040006000100701160002500043375668400998801220000图1螺栓阀阀帽截止止阀Fiigurre 11Bolltedd BoonneetGllobee Vaalvees(11)当开开启度小小于100%时，不不建议用用于节流流应用。(1) not recommended forthrottling at lessthan 10% Open.压力密封闸闸阀全开开状态下下的流量量系数CCvPrresssuree SeealGGatee Vaalvees FFULLL OPPEN Cv阀门通径VValv
30、ve SSizee压力等级PPresssurre CClasss6009001500250021/23346810122141661820024350522592252115033775557550866001102775133425517220022095503008500350455085501992533575552550755509915001199501155775199200027667527541157330166752292554555065570778900103325113422516682552411501902775466011100119700313304553555
31、5000721109221511145501665755压力密封缩缩喉管闸闸阀全开开状态下下的流量量系数CCvPrresssuree SeealVVentturii Gaate Vallvess FUULL OPEEN CCv阀门通径VValvve SSizee压力等级PPresssurre CClasss600900150025008 x 66 x 8100 x 8 xx 10012 x 110 xx 12214 x 112 xx 14416 x 114 xx 16618 x 116 xx 18820 x 118 xx 20022 x 220 xx 22226 x 224 xx 266157
32、0227955448857331099000011000014420001688002250000138522385540665622857720009766012218551600052230000118522155534550566406627008466511112001411308151443022515538555444156616557966096645螺栓阀盖旋旋启式止止回阀全全开状态态下的流流量系数数CvBBoltted CappSwiing Cheeck Vallvess FUULL OPEEN CCv阀门通径VValvve SSizee压力等级PPresssurre CCl
33、asss150300600900150011/22221/2346810122141661820024300631422217735667166141142996155720078660104116133800013442011670083333844545556631688275539227400199922334055720085444199464413880011302291662766366672554655297139922772466499913334333595544007044598840112911219554035586005166232250884066963316111
34、3155564415220螺栓阀帽截截止阀全全开状态态下的流流量系数数CvBBoltted BonnnettGloobe Vallvess FUULL OPEEN CCv阀门通径VValvve SSizee压力等级PPresssurre CClasss150300600900塞形或球形形阀瓣Pllug orBBalllDisscV形端口阀阀瓣V-PorrtDiisc塞形或球形形阀瓣Pllug orBBalllDisscV形端口阀阀瓣V-PorrtDiisc塞形或球形形阀瓣Pllug orBBalllDisscV形端口阀阀瓣V-PorrtDiisc塞形或球形形阀瓣Pllug orBBalllDi
35、ssc11/22221/234568101222343770100018852997444081101226011890040992177027734005744511150234377010001885440081001266018890214092177040557455234377010001885440078001811040992170040559001700压力密封提提升式阀阀瓣止回回阀全开开状态下下的流量量系数CCv PPresssurre SSeallTilltinng DDiscc Chheckk Vaalvees FFULLL OPPEN Cv阀门通径VValvve SSi
36、zee压力等级PPresssurre CClasss9001500250021/23346810122141661820024951466268862771066217722224200295553994544900062775922958013222300536694001466521110225500339954336555465580660609411463355662711020014220177752235553022537705554655压力密封缩缩喉管提提升式阀阀瓣止回回阀全开开状态下下的流量量系数CCv PPresssurre SSeallVennturri TTilttin
37、gg Diisc Cheeck Vallvess FUULL OPEEN CCv阀门通径VValvve SSizee压力等级PPresssurre CClasss1503006008 x 66 x 8100 x 8 xx 10012 x 110 xx 12214 x 112 xx 14416 xx 144 x 16118 xx 166 x 18220 xx 188 x 20222 xx 200 x 225659555155502217552666035550444100565004808445133201190002299530055339300492203205665922012275115
38、9882122027725333355球形止回阀阀，截止止止回阀阀，提升升式止回回阀的流流量特性性曲线CCharractteriistiic FFloww Cuurvees ffor Gloobe Stoop, Stoop-CChecck, Lifft-CChecck VValvves小于全开状状态的估估计流量量系数CCvEsstimmatiing Cv Forr Leess Thaan FFullly OOpenn Vaalvees图2球形止止回阀，截截止止回回阀和提提升式止止回阀FFiguure 2Gllobee Sttop, Sttop-Cheeck anddLifft-CChecck VValvves压力密封T形球形止回阀，截止止回阀和提升式止回阀阀全开状态下的流量系数CvPressure Seal T-Globe Stop,Stop-Check and Lift-Check Valves FULL OPEN Cv阀门通径Valve Size压力等级Pressure Class9001500250021/234681012149010519545580012501820220565951703956951085158045651052654707501100压力密封Y球形止回阀，截止止回阀和提升式止回阀阀全开状态