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Butterfly Valves - Flow Coefficients Cv

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The table below can be used to indicate butterfly valves and their flow coefficients at different open (or closed) positions. Manufacturers data should always be checked before actual use.

Butterfly Valves - Flow Coefficients 
Valve SizeFlow Coefficient - Cv
Openness
(disc angle)		Maximum flow velocity
(ft/sec)
inchesmm90 deg
(wide open)		70 deg50 deg30 degANSI 150ANSI 300
2 50 85 65 35 15 90 90
2 1/2 65 160 120 65 29 80 90
3 80 260 195 104 47 80 80
4 100 475 356 190 86 80 80
5 125 770 577 308 139 80 80
6 150 1125 844 450 203 75 80
8 200 2110 1583 844 380 70 75
10 250 3350 2513 1340 603 60 70
12 300 4800 3600 1920 864 50 60
14 350 6900 5175 2760 1224 50
16 400 9000 6750 3600 1620 50
18 450 11800 8850 4720 2124 50
20 500 14300 10725 5720 2574 50
  • 1 ft/s = 0.3048 m/s
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