閥門流量計算方法介紹

1、Evaluation Warning: The document was created with Spire.Doc for .NET.閥門流量計計算方法法如何使用流流量系數(shù)數(shù)Howw too usse CCv閥門流流量系數(shù)數(shù)(Cvv)是表表示閥門門通過流流體能力力的數(shù)值值。Cvv越大，在在給定壓壓降下閥閥門能夠夠通過的的流體就就越多。CCv值11表示當當通過壓壓降為11 PSSI時，閥閥門每分分鐘流過過1加侖侖15oC的水水。Cvv值3550表示示當通過過壓降為為1 PPSI時時，閥門門每分鐘鐘流過3350加加侖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/小小時(蒸蒸汽或水水)FLOOW RRATEE LBBS/HHR (Steeam or Watter)在此：Whheree:dp=壓降，單位位：PSSIdp=presssuree drrop in PSIIF=流速，單位位：磅/小時F=flow ratte iin llbs./hrr.=比容積的平平方根，單單位：立立方英尺

4、尺/磅(閥門下下游)=squarre rroott off a speeciffic vollumee inn ftt3/lbb.(ddownnstrreamm off vaalvee)公式2FOORMUULA 2流速：加倫/分鐘(水或其其它液體體)FLOOW RRATEE GPPM (Watter or othher liqquidds)在此：Whheree:dp=壓降，單位位：PSSIdp=presssuree drrop in PSIISg=比重Sg=speciificc grraviityQ=流速，單位位：加倫倫/分鐘鐘Q=flow ratte iin GGPM局限性LIIMITTAT

5、IIONSS上列公公式在下下列條件件下無效效：Aboove forrmullas aree noot vvaliid uundeer tthe folllowwingg coondiitioons:對于可壓縮縮性流體體，如果果壓降超超過進口口壓力的的一半。For compressible fluids, where pressure drop exceeds half the inlet pressure. 對于不可壓壓縮性流流體，如如果壓降降產(chǎn)生空空穴或閃閃蒸。FFor nonn-coomprresssiblle ffluiids, whheree prresssuree drrop cau

6、usess caavittatiion or flaashiing. 對于雙相流流體，如如蒸汽-水混合合流體。For dual-phase flow such as steam-water mixtures. 例子EXAAMPLLE通過DN3350, 壓力力等級CClasss 9900的的壓力密密封閘閥閥，水溫溫4000oF，壓壓力為115000 PSSIG，流流速為55,0000,0000磅磅/小時時的壓降降是多少少？Whhat is thee prresssuree drrop thrrouggh aa 144 CClasss 9900 preessuure seaal ggatee va

7、alvee 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 (從從水溫為為4000oF的表表中得到到)=0.1377 (ffromm chhartt foor wwateer aat 4400ooF)Cv=9150 (來自自本頁)Cv=9150 (frrom pagge 226)DN3500 x DN3300 x DDN3550，壓壓力等級級Claass 9000縮喉管管

8、壓力密密封閘閥閥，其它它條件與與例1相相同，求求壓降。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 (來自本頁)Cv = 6285 (from page 26)溫度9000oF, 壓力112000 PSSI，流流速5000,0000磅磅/小時時的蒸汽汽應用中中壓降小小于5 PSII的壓力力等級CClasss 2

9、25000閘閥的的最小通通徑是多多少？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 (來來自9000oF, 12000 PPSIGG蒸汽表

10、表)=0.7855 (ffromm chhartt foor ssteaam aat 9900ooF, 12000 PPSIGG)= 2.224最接近近的、較較大的CCv是DDN2550壓力力等級CClasss 225000閘閥，其其Cv是是31330。這這里是壓壓降小于于5 PPSIGG的最小小的閥門門。Thee clloseest higgherr Cvv iss a 10 Cllasss 25500 gatte wwithh a Cv of 31330. Thiis iis tthe smaalleest vallve witth aa prresssuree drrop lesss t

11、thann 5 PSIIG.水和蒸汽的的備選特特性Seelecctedd Prropeertiies of Watter andd Stteamm水的(下游游)Foor WWateer (Dowwnsttreaam)所有壓力等等級AlllPrresssurees溫度(oFF)Teempeeratturee (ooF)1002003004005006000.12770.12990.13220.13770.14330.1544蒸汽的(下下游)FFor Steeam (Doownsstreeam)壓力PSIIG PPresssurrePSSIG溫度(oFF)Teempeeratturee (ooF)

12、Sat50060070080090010001100100200030004000500060007000800090001000011100012000133001140001600018800220000250003000044000050000600001.9711.4661.2211.0600.95500.86550.88010.74770.770100.66620.62880.55980.557000.54452.2011.6111.3301.1100.97790.89552.3211.6881.3381.1911.0660.996000.88800.81550.775900.711

13、00.67000.662900.59900.55992.4411.7771.4461.2611.1221.0020.94110.887500.82210.77330.773200.69950.66220.663300.5880.5540.5000.4110.3110.1170.1600.1662.5411.8551.5521.3321.1811.0880.999400.92260.87000.881600.78810.74550.771000.68830.6300.5990.5550.4800.4220.3320.2400.1992.6411.9551.6601.3811.2331.1131.

14、0400.97720.91440.886500.82230.78550.775200.72230.6700.6330.5590.5200.4660.3380.3200.2882.7422.0001.6651.4311.2881.1171.0811.0110.995500.91170.87220.881300.78890.75220.7700.6600.6220.5550.4900.4220.3360.322.8422.0771.7711.4711.3331.2221.1211.0550.9990.9400.9000.8860.8300.7990.7740.6900.6550.5580.5200

15、.4440.3390.35閥座端口流流速計算算Callcullatiing Seaat PPortt Veeloccityy下列公公式可以以用來計計算任何何閥門的的閥座流流速：Thhe ffolllowiing forrmullas cann bee ussed to callcullatee seeat porrtveeloccityy inn anny vvalvve:流量(磅/小時): 流流速: (英尺尺/秒)= F()225AFlow (lbbs/hhr): veel: (fpps) = F()225A流量(加侖侖/分鐘鐘): 流速: (英英尺/秒秒)= 0.32QAFlow (GPP

16、M): veel: (fpps) = 0.32QA在此：Whheree:F=流量(磅/小時)F=flow (lbbs/hhr)=比容積的平平方根=squarre rroott off sppeciificc voolummeA=閥座端口面面積 (英寸22)A=seat porrt aareaa (iin2)Q=流量 (加加侖/分分鐘)Q=flow (gppm)例：DDN3000型號號588809 (壓力力等級CClasss 9900)止回閥閥，流體體介質(zhì)為為溫度5500 oF，壓壓力2000 PPSIGG的蒸汽汽，流速速為900,0000磅/小時，求求閥座端端口的流流速？ Exaamplle:

17、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：從從蒸汽表表得為11.611，從閥閥座端口口面積表表A得閥閥座端口口面積為為78.5英寸寸2。Ansswerr:Froom tthe steeam tabbless iss 1.61, annd ffromm thhe sseatt poo

18、rt 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型號號1800 (壓壓力等級級1500)旋啟啟式止回回閥，流流體介質(zhì)質(zhì)為溫度度5000oF，壓壓力2000 PPSIGG的蒸汽汽，流速速為900,0000磅/小時，求求閥座端端口流速速？Exxampple:WWhatt iss thhe sseatt poort vellociity

19、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：查查表得為為1.661，AA為 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/秒Vel (fpss) = F()

20、225A=90,000 (1.61)225 (113.1)= 82.5 ffps局限性LIIMITTATIIONSS流速公公式在下下列條件件下無效效：VVeloocitty fformmulaas aare nott vaalidd unnderr thhe ffolllowiing conndittionns:對于可壓縮縮性流體體，如果果壓降超超過進口口壓力的的一半。For compressible fluids, where pressure drop exceeds half the inlet pressure. 對于不可壓壓縮性流流體，如如果壓降降產(chǎn)生空空穴或閃閃蒸。FFor non

21、n-coomprresssiblle ffluiids, whheree prresssuree drrop cauusess caavittatiion or flaashiing. 對于雙相流流體，如如蒸汽-水混合合流體。For dual-phase flow such as steam-water mixtures. 注意NOTTE在確定定止回閥閥通徑時時，最適適宜的工工作流速速應該位位于這些些范圍內(nèi)內(nèi)：Wheen ddeteermiininng ssiziing forr chheckk vaalvees, thee opptimmum opeerattingg veeloccitii

22、es shoouldd faall witthinn thhesee raangees:BB旋啟式式止回閥閥：555 至1115或或1355至2440BBB截止止止回閥：40 至1220 PPS提升升式閥瓣瓣止回閥閥：555至2000 PPSY形形止回閥閥：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 - 55 to 2000 PSS Sttop Che

23、eck Vallvess - 40 to 1800PS Y- Stoop CChecck VValvves - 1148 to 2200 閥座端口面面積“AA”(英英寸2)適用于于螺栓閥閥帽閥門門SEAAT PPORTT ARREA A FOOR BBOLTTEDBBONNNET VALLVESS (iin2)閥門通徑VValvve SSizee壓力等級PPresssurre CClasss150300600900150011/22221/234681012214166182002430036 7.1122.6228.3350.3788.51113.11337.991822.

24、72233.72991.004244.56671.99669.007.1122.6228.3350.3788.51113.11337.991822.72227.02883.554244.56672.09442.00112.6288.3448.7774.71008.441300.21170.92113.882611.63380.15990.99854.96.5111.8226.0044.2711.01100.01117.96.0100.3222.7738.5600.0884.551011.6閥座端口面面積(英英寸2)適用

25、于于壓力密密封閘閥閥，截止止閥，提提升式閥閥瓣止回回閥SEEAT PORRT AAREAA FOOR PPRESSSURRE SSEALL GAATE,GLOOBE, TIILT DISSC CCHECCK VVALVVES (inn2)閥門通徑VValvve SSizee壓力等級PPresssurre CClasss6009001500250021/233468101221416618200233.2339.9961.0888.71733.83100.2555.95.9100.3221.7737.7588.4880.5597.21225.221566.71198.028

26、87.3188.9331.9948.7699.0882.551088.41137.91770.99245.9122.6221.7734.5477.2558.2276.6977.21117.91770.99閥座端口面面積(英英寸2)適用于于壓力密密封Y形形截止閥閥SEAAT PPORTT ARREA FORR PRRESSSUREE SEEAL Y-GGLOBBEVAALVEES (in22)閥門通徑VValvve SSizee壓力等級PPresssurre CClasss9001500250081012214166182002439.9661.9986.

27、6866.61135.41355.41198.13002.6639.9661.9986.6866.61135.41335.441988.13302.627.2442.8860.1866.6886.661355.41135.41998.11螺栓閥帽閘閘閥全開開狀態(tài)下下的流量量系數(shù)CCvBoolteed BBonnnetGGatee Vaalvees FFULLL OPPEN Cv閥門通徑VValvve SSizee壓力等級PPresssurre CClasss150300600900150011/22221/23456810122141661820024300361653007499071101

28、330022090031110577208893551333501162775211560028772033576605221655862235112955001653007499071101330031110577208893551333501162775211560027889033484405110500847765112588251653007499071101330031110555408849551288001153770299170026277032214004677107755330111425506550122202855050025778500114475113911013

29、8277040006000100701160002500043375668400998801220000圖1螺栓閥閥帽截止止閥Fiigurre 11Bolltedd BoonneetGllobee Vaalvees(11)當開開啟度小小于100%時，不不建議用用于節(jié)流流應用。(1) not recommended forthrottling at lessthan 10% Open.壓力密封閘閘閥全開開狀態(tài)下下的流量量系數(shù)CCvPrresssuree SeealGGatee Vaalvees FFULLL OPPEN Cv閥門通徑VValvve SSizee壓力等級PPresssurre CC

30、lasss6009001500250021/23346810122141661820024350522592252115033775557550866001102775133425517220022095503008500350455085501992533575552550755509915001199501155775199200027667527541157330166752292554555065570778900103325113422516682552411501902775466011100119700313304553555500072110922151114550166575

31、5壓力密封縮縮喉管閘閘閥全開開狀態(tài)下下的流量量系數(shù)CCvPrresssuree SeealVVentturii Gaate Vallvess FUULL OPEEN CCv閥門通徑VValvve SSizee壓力等級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 266157022795544885733109900001100

32、0014420001688002250000138522385540665622857720009766012218551600052230000118522155534550566406627008466511112001411308151443022515538555444156616557966096645螺栓閥蓋旋旋啟式止止回閥全全開狀態(tài)態(tài)下的流流量系數(shù)數(shù)CvBBoltted CappSwiing Cheeck Vallvess FUULL OPEEN CCv閥門通徑VValvve SSizee壓力等級PPresssurre CClasss150300600900150011/2222

33、1/23468101221416618200243006314222177356671661411429961557200786601041161338000134420116700833338445455566316882755392274001999223340557200854441994644138800113022916627663666725546552971399227724664999133343335955440070445988401129112195540355860051662322508840669633161113155564415220螺栓閥帽截截止閥全全開狀態(tài)態(tài)

34、下的流流量系數(shù)數(shù)CvBBoltted BonnnettGloobe Vallvess FUULL OPEEN CCv閥門通徑VValvve SSizee壓力等級PPresssurre CClasss150300600900塞形或球形形閥瓣Pllug orBBalllDisscV形端口閥閥瓣V-PorrtDiisc塞形或球形形閥瓣Pllug orBBalllDisscV形端口閥閥瓣V-PorrtDiisc塞形或球形形閥瓣Pllug orBBalllDisscV形端口閥閥瓣V-PorrtDiisc塞形或球形形閥瓣Pllug orBBalllDissc11/22221/234568101222343

35、770100018852997444081101226011890040992177027734005744511150234377010001885440081001266018890214092177040557455234377010001885440078001811040992170040559001700壓力密封提提升式閥閥瓣止回回閥全開開狀態(tài)下下的流量量系數(shù)CCv PPresssurre SSeallTilltinng DDiscc Chheckk Vaalvees FFULLL OPPEN Cv閥門通徑VValvve SSizee壓力等級PPresssurre CClasss9

36、001500250021/23346810122141661820024951466268862771066217722224200295553994544900062775922958013222300536694001466521110225500339954336555465580660609411463355662711020014220177752235553022537705554655壓力密封縮縮喉管提提升式閥閥瓣止回回閥全開開狀態(tài)下下的流量量系數(shù)CCv PPresssurre SSeallVennturri TTilttingg Diisc Cheeck Vallvess FU

37、ULL OPEEN CCv閥門通徑VValvve SSizee壓力等級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 2256595551555022175526660355504441005650048084451332011900022995300553393004922032056659220122751159882122027725333355球形止回閥閥，截

38、止止止回閥閥，提升升式止回回閥的流流量特性性曲線CCharractteriistiic FFloww Cuurvees ffor Gloobe Stoop, Stoop-CChecck, Lifft-CChecck VValvves小于全開狀狀態(tài)的估估計流量量系數(shù)CCvEsstimmatiing Cv Forr Leess Thaan FFullly OOpenn Vaalvees圖2球形止止回閥，截截止止回回閥和提提升式止止回閥FFiguure 2Gllobee Sttop, Sttop-Cheeck anddLifft-CChecck VValvves壓力密封T形球形止回閥，截止止回閥和提

39、升式止回閥閥全開狀態(tài)下的流量系數(shù)CvPressure Seal T-Globe Stop,Stop-Check and Lift-Check Valves FULL OPEN Cv閥門通徑Valve Size壓力等級Pressure Class9001500250021/234681012149010519545580012501820220565951703956951085158045651052654707501100壓力密封Y球形止回閥，截止止回閥和提升式止回閥閥全開狀態(tài)下的流量系數(shù)CvPressure Seal Y-Globe Stop,Stop-Check and Lift-Che

40、ck Valves FULL OPEN Cv閥門通徑Valve Size壓力等級Pressure Class60090015002500810121416182024202530254600430076507325118001645017502725382536506000582591251350017502725382536506000582591251350011751875265040753775662562259050表中所所列流量量系數(shù)僅僅適用于于全開狀狀態(tài)下的的閥門。不不是全開開狀態(tài)的的流量系系數(shù)可以以采用適適用于提提升式閥閥瓣止回回閥和截截止閥的的流量特特性曲線線進行估估算。不不

41、建議將將閘閥用用在節(jié)流流應用中中。Thee fllow coeeffiicieent (Cvv) llistted in thee taablees aapplly tto ffullly oopenn vaalvees oonlyy. FFloww cooeffficiientts aat ootheer tthann fuullyy oppen mayy bee appprooximmateed bby uuse of thee chharaacteerissticc fllow currvess foor ttilttingg diisc cheeck andd gllobee vaal