閥門系數(shù)Cv和KV值計算表格（帶公式）

1、閥門系數(shù)Cv值,一.液體,附表1:典型FL系數(shù), 壓力恢復系數(shù)FL,=,0.55,查附表1,調節(jié)閥形式,流向,FL值,液體臨界壓力Pc,=,3208.2,psia,查附表2,單座調節(jié)閥,柱塞形閥芯,流開,0.90,流量Q,=,850,gal/min,流閉,0.80,液體比重Sg,=,1,“V”形閥芯,任意流向,0.90,液體的蒸氣壓力Pv,=,45.6,psia,套筒形閥芯,流開,0.90,上游壓力P1,=,284.3,psia,流閉,0.80,下游壓力P2,=,0,psia, 雙座調節(jié)閥,柱塞形閥芯,任意流向,0.85,壓力降P,=,P1-P2,=,284.3,psia,“V”形閥芯,任意流

2、向,0.90,阻塞壓力降Pc1,=,FL2(P1-Pv),=,72.20675,psia, 角形調節(jié)閥,柱塞形閥芯,流開,0.80,阻塞壓力降Pc2,=,FL2(P1-(0.96-0.28 )Pv,=,73.90826674,psia,流閉,0.90,比較Pv與0.5P1值的大小,IF(Pv0.5P1,Pc=Pc1,否則為Pc=Pc2),套筒形閥芯,流開,0.85,阻塞壓力降Pc,=,72.20675,psia,流閉,0.80,比較P與Pc的大小,IF(PPc,為一般流動1,否則為阻塞流動2),文丘里形,流閉,0.50,判別流動狀態(tài),2,球閥,“O”型,任意流向,0.55,閥門系數(shù)Cv1值,=

3、,Q,=,50.41160166,一般流動,蝶閥,60全開,任意流向,0.68,90全開,任意流向,0.55,閥門系數(shù)Cv2值,=,Q,=,100.0299442,阻塞流動,偏心旋轉閥,流開,0.85,IF(PPc,Cv=Cv1,否則為Cv=Cv2),附表2:常用工藝流體的臨界壓力Pc,閥門系數(shù)Cv值,=,100.0299442,液體,臨界壓力/(psia/bar),液體,臨界壓力/(psia/bar),氨氣,1636.1/112.8,異丁烷,529.2/36.5,氬,707.0/49.0,異丁烯,529.2/36.5二.氣體,苯,710.0/49.0,煤油,350.0/24.1 壓力恢復系數(shù)

4、FL,=,0.9,查附表1,丁烷,551.2/38.0,甲烷,667.3/46.0流量Q,=,2000000,scfh,CO2,1070.2/73.8,氮,492.4/33.9氣體重度Gg,=,1,CO,507.1/35.0,一氧化氮,1051.1/72.5上游壓力P1,=,1314.7,psia,氯,1117.2/77.0,氧,732.0/50.5下游壓力P2,=,1000,psia,道氏熱載體A,547.0/37.7,光氣,823.2/56.8壓力降P,=,P1-P2,=,314.7,psia,乙烷,708.5/48.8,丙烷,615.9/42.5溫度T,=,68,F,乙烯,730.5/5

5、0.3,丙烯,670.3/46.2絕對上游溫度T1(R=F+460),=,528,F,燃料油,330.0/22.8,冷凍劑11,639.4/44.1 比較 與0.5FL2的大小,IF( 0.5FL2,為一般流動1,否則為阻塞流動2),汽油,410.0/28.3,冷凍劑12,598.2/41.2,氦,32.9/2.3,冷凍劑22,749.7/51.7,氫,188.1/13.0,海水,3200.0/220.7判別流動狀態(tài),1,HCI,1205.4/83.1,水,3208.2/221.2閥門系數(shù)Cv1值,=,=,55.99217258,一般流動,閥門系數(shù)Cv2值,=, FL,=,37.76874124,阻塞流動,IF( 0.5FL2,Cv=Cv1,否則為Cv=Cv2),