Ball Valves - Flow Coefficients Cv

Flow coefficients - Cv - for typical ball valves - reduced and full bore. A conventional ball valve is normally not used as a throttling valve since a partial flow will create high velocity flow tear at the ball and the seal. These values are suitable for estimates only.

Valve Type	Valve Size (inches)	Valve Size (mm)	Flow Coefficient Cv
Full Bore	1/2	12	26
Full Bore	3/4	19	50
Full Bore	1	25	94
Full Bore	1 1/2	37.5	260
Full Bore	2	50	480
Full Bore	2 1/2	62.5	750
Full Bore	3	75	1300
Full Bore	4	100	2300
Full Bore	6	150	5400
Full Bore	8	200	10000
Full Bore	10	250	16000
Full Bore	12	300	24000
Full Bore	14	350	31400
Full Bore	16	400	43000
Full Bore	18	450	57000
Reduced Bore	3	75	420
Reduced Bore	4	100	770
Reduced Bore	6	150	1800
Reduced Bore	8	200	2500
Reduced Bore	10	250	4500
Reduced Bore	12	300	8000
Reduced Bore	14	350	12000
Reduced Bore	16	400	14000
Reduced Bore	18	450	18000
Reduced Bore	20	500	22000