Butterfly Valves - Flow Coefficients C_v

Typical flow coefficients - C_v - for butterfly valves.

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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.

Flow Coefficient - C_v
Valve Size		Openness (disc angle)				Maximum flow velocity (ft/sec)
inches	mm	90 deg (wide open)	70 deg	50 deg	30 deg	ANSI 150	ANSI 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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