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Butterfly Valves


Cv value of Butterfly Valves

The valves Cv is the flow rate (in US gal/min) of pure water at 600F passing through the valves when the valves disc is fully opened and the pressure differential between the two ends of the valves is 1 Lbf/in 2

V. Max. Flow ( in us gal/min)
G: Specific gravity (1 for water)
P1: Inlet side pressure (
Lbf/in 2)
P2:Outlet side pressure (Lbf/in2)
Cv = 1.17C

Conversion of flow resistance coefficient and Cv value

d:Valves bore size or valves seat bore size (in)
ζ : Flow resistance coefficient (no unit)

Size Flow in Gpm@ 1PSI P@ Various Disc Angles Full 90?open
inch DN 10?/td> 20?/td> 30?/td> 40?/td> 50?/td> 60?/td> 70?/td> 80?/td>
2" 50 0.1 5 12 24 45 64 90 125 135
2.5" 65 0.2 8 20 37 65 98 144 204 220
3" 80 0.3 12 22 39 70 116 183 275 302
4" 100 0.5 17 36 78 139 230 364 546 600
5" 125 0.8 29 61 133 237 392 620 930 1022
6" 150 2 45 95 205 366 605 958 1437 1579
8" 200 3 89 188 408 727 1202 1903 2854 3136
10" 250 4 151 320 94 1237 2047 324 0 4859 5340
12" 300 5 234 495 1072 1911 3162 5005 7507 8250
14" 350 6 338 715 1549 2761 4568 7230 10844 11917
16" 400 8 464 983 2130 3971 6282 9942 14913 16388
18" 450 11 615 1302 2822 5028 8320 13168 19752 21705
20" 500 14 791 1674 3628 6465 10698 16931 25396 27903
24" 600 22 1222 2587 5606 9989 16538 26157 39236 43116
28" 700 36 1813 3639 6636 10000 14949 22769 34898 49500
32" 800 45 2387 4791 8736 13788 20613 31395 48117 68250
36" 900 60 3021 3063 11055 17449 26086 39731 60895 86375
40" 1000 84 4183 8395 15307 24159 36166 55084 84425 119750




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