閥門系數(shù)Cv和KV值計算表格

1、閥閥門門系系數(shù)數(shù)CvCv值值一一. .液液體體 壓壓力力恢恢復(fù)復(fù)系系數(shù)數(shù)F FL L= =0.55查查附附表表1 1液液體體臨臨界界壓壓力力PcPc= =3208.2psia查查附附表表2 2流流量量Q Q= =850gal/min液液體體比比重重SgSg= =1液液體體的的蒸蒸氣氣壓壓力力PvPv= =45.6psia上上游游壓壓力力P1P1= =284.3psia下下游游壓壓力力P2P2= =0psia壓壓力力降降PP= =P1-P2= =284psia阻阻塞塞壓壓力力降降Pc1Pc1= =FL2(P1-Pv)= =72.2 psia阻阻塞塞壓壓力力降降Pc2Pc2= =FL2(P1-(0

2、.96-0.28 )Pv= =73.9 psia比比較較PvPv與與0.5P10.5P1值值的的大大小小IF(Pv0.5P1,Pc=Pc1,否則為Pc=Pc2)阻阻塞塞壓壓力力降降PcPc= =72.20675psia比比較較PP與與PcPc的的大大小小IF(PPc,為一般流動1,否則為阻塞流動2)判判別別流流動動狀狀態(tài)態(tài)2 2閥閥門門系系數(shù)數(shù)Cv1Cv1值值= =Q= =50.4 一一般般流流動動閥閥門門系系數(shù)數(shù)Cv2Cv2值值= =Q= =100阻阻塞塞流流動動IF(PIF(PPc,Cv=Cv1,Pc,Cv=Cv1,否否則則為為Cv=Cv2)Cv=Cv2)閥閥門門系系數(shù)數(shù)CvCv值值= =

3、100.0299442二二. .氣氣體體 壓壓力力恢恢復(fù)復(fù)系系數(shù)數(shù)F FL L= =0.9查查附附表表1 1流流量量Q Q= =2000000scfh氣氣體體重重度度GgGg= =1上上游游壓壓力力P1P1= =1314.7psia下下游游壓壓力力P2P2= =1000psia壓壓力力降降PP= =P1-P2= =315psia溫溫度度T T = = 68F絕絕對對上上游游溫溫度度T1(R=F+460)T1(R=F+460) = = 528F 比比較較 與與0.5F0.5FL L2 2的的大大小小IF(IF( 0.5F0.5FL L2 2, ,為為一一般般流流動動1,1,否否則則為為阻阻塞塞流

4、流動動2)2)判判別別流流動動狀狀態(tài)態(tài)1 1閥閥門門系系數(shù)數(shù)Cv1Cv1值值 = = =56一一般般流流動動閥閥門門系系數(shù)數(shù)Cv2Cv2值值 = = FL= =37.8 阻阻塞塞流流動動PcSgDPSgD1PPD1PPD21211360PPPGgTQ+D1121178PGgTQIF(IF( 0.5F0.5FL L2 2,Cv=Cv1,Cv=Cv1,否否則則為為Cv=Cv2)Cv=Cv2)閥閥門門系系數(shù)數(shù)CvCv值值= =55.99217258計計算算程程序序使使用用說說明明: :1.黃色區(qū)域需輸入已知條件數(shù)據(jù).2.粉紅區(qū)域為閥門系數(shù)Cv值的結(jié)果.3.Kv=0.85Cv1PPD附附表表1:1:典

5、典型型FLFL系系數(shù)數(shù)調(diào)調(diào)節(jié)節(jié)閥閥形形式式流流向向FLFL值值單單座座調(diào)調(diào)節(jié)節(jié)閥閥柱塞形閥芯流開0.90流閉0.80“V”形閥芯任意流向0.90套筒形閥芯流開0.90流閉0.80 雙雙座座調(diào)調(diào)節(jié)節(jié)閥閥柱塞形閥芯任意流向0.85“V”形閥芯任意流向0.90 角角形形調(diào)調(diào)節(jié)節(jié)閥閥柱塞形閥芯流開0.80流閉0.90套筒形閥芯流開0.85流閉0.80文丘里形流閉0.50球球閥閥“O”型任意流向0.55蝶蝶閥閥60全開任意流向0.6890全開任意流向0.55偏偏心心旋旋轉(zhuǎn)轉(zhuǎn)閥閥流開0.85附附表表2:2:常常用用工工藝藝流流體體的的臨臨界界壓壓力力PcPc液液體體臨臨界界壓壓力力/(psia/bar)/

6、(psia/bar)液液體體臨臨界界壓壓力力/(psia/bar)/(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苯710.0/49.0煤油350.0/24.1丁烷551.2/38.0甲烷667.3/46.0CO21070.2/73.8氮492.4/33.9CO507.1/35.0一氧化氮1051.1/72.5氯1117.2/77.0氧732.0/50.5道氏熱載體A547.0/37.7光氣823.2/56.8乙烷708.5/48.8丙烷615.9/42.5乙烯730.5/50.3丙烯670.3/46.2燃料油330.

7、0/22.8冷凍劑11639.4/44.1汽油410.0/28.3冷凍劑12598.2/41.2氦32.9/2.3冷凍劑22749.7/51.7氫188.1/13.0海水3200.0/220.7HCI1205.4/83.1水3208.2/221.2閥閥門門系系數(shù)數(shù)KvKv值值一一. .液液體體 壓壓力力恢恢復(fù)復(fù)系系數(shù)數(shù)F FL L= =0.55查查附附表表1 1液液體體臨臨界界壓壓力力PcPc= =224100KPa查查附附表表2 2流流量量Q Q= =1496m3/h或t/h液液體體比比重重r r= =1g/cm3液液體體的的蒸蒸氣氣壓壓力力PvPv= =2100KPa上上游游壓壓力力P1P

8、1= =19.6100KPa下下游游壓壓力力P2P2= =0100KPa壓壓力力降降PP= =P1-P2= =19.6 100KPa阻阻塞塞壓壓力力降降Pc1Pc1= =V = =5.32 100KPa阻阻塞塞壓壓力力降降Pc2Pc2= =FL2(P1-(0.96-0.28 )Pv= =5.4 100KPa比比較較PvPv與與0.5P10.5P1值值的的大大小小IF(Pv0.5P1,Pc=Pc1,否則為Pc=Pc2)阻阻塞塞壓壓力力降降PcPc= =5.324100KPa比比較較PP與與PcPc的的大大小小IF(PPc,為一般流動1,否則為阻塞流動2)判判別別流流動動狀狀態(tài)態(tài)2 2閥閥門門系系

9、數(shù)數(shù)Kv1Kv1值值= =Q= =338一一般般流流動動閥閥門門系系數(shù)數(shù)Kv2Kv2值值= =Q= =648阻阻塞塞流流動動IF(PIF(PPc,Kv=Kv1,Pc,Kv=Kv1,否否則則為為Kv=Kv2)Kv=Kv2)閥閥門門系系數(shù)數(shù)KvKv值值= =648.3545607閥閥門門系系數(shù)數(shù)CvCv值值=762.4649634762.4649634二二. .氣氣體體 壓壓力力恢恢復(fù)復(fù)系系數(shù)數(shù)F FL L= =0.9查查附附表表1 1流流量量Q QN N= =100Nm3/h氣氣體體重重度度r rN N= =1kg/Nm3上上游游壓壓力力P1P1= =2100KPa下下游游壓壓力力P2P2= =

10、1.1100KPa壓壓力力降降PP= =P1-P2= =0.9100KPa溫溫度度t t = = 20C 比比較較 與與0.5F0.5FL L2 2的的大大小小IF(IF( 0.5F0.5FL L2 2, ,為為一一般般流流動動1,1,否否則則為為阻阻塞塞流流動動2)2)判判別別流流動動狀狀態(tài)態(tài)2 2閥閥門門系系數(shù)數(shù)Kv1Kv1值值 = = =2.7一一般般流流動動閥閥門門系系數(shù)數(shù)Kv2Kv2值值 = = = =2.88阻阻塞塞流流動動IF(IF( 0.5F0.5FL L2 2,Kv=Kv1,Kv=Kv1,否否則則為為Kv=Kv2)Kv=Kv2)1PPD1PPD1PPDPrDPcrD)21()

11、273(PPPtrN+D+3 8 0QN3 3 0QNLF1*1)273(PtrN+閥閥門門系系數(shù)數(shù)KvKv值值= =2.881690702計計算算程程序序使使用用說說明明: :1.黃色區(qū)域需輸入已知條件數(shù)據(jù).2.粉紅區(qū)域為閥門系數(shù)Kv值的結(jié)果.3.Cv=1.176KvIF(IF( 0.5F0.5FL L2 2,Kv=Kv1,Kv=Kv1,否否則則為為Kv=Kv2)Kv=Kv2)1PPD附附表表1:1:典典型型FLFL系系數(shù)數(shù)調(diào)調(diào)節(jié)節(jié)閥閥形形式式流流向向FLFL值值單單座座調(diào)調(diào)節(jié)節(jié)閥閥柱塞形閥芯流開0.90流閉0.80“V”形閥芯任意流向0.90套筒形閥芯流開0.90流閉0.80 雙雙座座調(diào)調(diào)

12、節(jié)節(jié)閥閥柱塞形閥芯任意流向0.85“V”形閥芯任意流向0.90 角角形形調(diào)調(diào)節(jié)節(jié)閥閥柱塞形閥芯流開0.80流閉0.90套筒形閥芯流開0.85流閉0.80文丘里形流閉0.50球球閥閥“O”型任意流向0.55蝶蝶閥閥60全開任意流向0.6890全開任意流向0.55偏偏心心旋旋轉(zhuǎn)轉(zhuǎn)閥閥流開0.85附附表表2:2:常常用用工工藝藝流流體體的的臨臨界界壓壓力力PcPc介介質(zhì)質(zhì)名名稱稱Pc(100KPaPc(100KPa 絕絕壓壓) )介介質(zhì)質(zhì)名名稱稱Pc(100KPaPc(100KPa 絕絕壓壓) )醋酸59甲烷47.2丙酮48.4甲醇81乙烷63.7氧51.2空氣38.2氧化氯73.8氨114.5辛烷

13、25.4氮34.5氯73氟25.7乙烷50.2氦2.33乙醇65氫13.1氯化氫84氬49.4丙烷43.2苯49二氧化硫80二氧化碳75水224一氧化碳36戊烷34閥閥門門通通道道直直徑徑D D= =76mm節(jié)節(jié)流流截截面面積積A A= = D2=4534.16mm2調(diào)調(diào)節(jié)節(jié)閥閥阻阻力力系系數(shù)數(shù)= =0.1流流體體密密度度= =1kg/mm3調(diào)調(diào)節(jié)節(jié)閥閥進進口口壓壓力力P1P1= =1.96MPa調(diào)調(diào)節(jié)節(jié)閥閥出出口口壓壓力力P2P2= =0MPa調(diào)調(diào)節(jié)節(jié)閥閥流流量量Q Q= =Q=89771.78792m3/s=1496.196465m3/h一一. .液液體體 壓壓力力恢恢復(fù)復(fù)系系數(shù)數(shù)F FL

14、 L= =0.55查查附附表表1 1液液體體臨臨界界壓壓力力PcPc= =224100KPa查查附附表表2 2流流量量Q Q= =1496.196465m3/h或t/h液液體體比比重重r r= =1g/cm3液液體體的的蒸蒸氣氣壓壓力力PvPv= =20100KPa上上游游壓壓力力P1P1= =51100KPa下下游游壓壓力力P2P2= =0100KPa壓壓力力降降PP= =P1-P2= =51 100KPa阻阻塞塞壓壓力力降降Pc1Pc1= =V = =9.3775 100KPa阻阻塞塞壓壓力力降降Pc2Pc2= =FL2(P1-(0.96-0.28 )Pv= =10.42780355 100KPa比比較較PvPv與與0.5P10.5P1值值的的大大小小IF(Pv0.5P1,Pc=Pc1,否則為Pc=Pc2)阻阻塞塞壓壓力力降降PcPc= =9.3775100KPa比比較較PP與與PcPc的的大大小小IF(PPc,為一般流動1,否則為阻塞流動2)判判別別