Ball Valves Flow Rate

 The below CV values are used to give an indication of flow rates for ball valves. CV value is an imperial measure of flow in US gallons per minute of water at 60° fahrenheit with a pressure drop of 1 psi across the valve. This is used as a guide and is not a linear progression.

V Port Ball Valves Flow Rate (CV)

Valve Size	Ball Angle	15%	20%	30%	40%	50%	60%	70%	80%	90%	100%
1/2"	30°*	0.1	0.1	0.2	0.3	0.5	0.8	1.1	1.6	2.2	2.6
	60°	0.1	0.1	0.3	0.5	0.9	1.4	2	3.3	4.4	6
3/4"	30°*	0.1	0.2	0.5	0.7	1.1	1.8	2.4	3.3	4.5	5.4
	60°	0.1	0.2	0.7	1	1.7	2.8	4	6.5	9	12
1"	30°*	0.1	0.3	0.8	1.3	2.3	3.5	5.1	9.8	8.5	10
	60°	0.2	0.4	1.1	1.8	3.4	5.3	7.9	12.3	15.3	21
1 1/4"	30°*	0.2	0.4	1.1	2	3.7	5.5	8	10	13	15
	60°	0.2	0.6	1.8	3	5.5	9.5	12.8	19	26	39
1 1/2"	30°*	0.3	0.6	1.6	3	5	7.5	11	14	17	20
	60°	0.4	0.8	2.5	4	8	13	19	27	40	52
2"	30°*	0.4	1.2	3.8	6	10	15	23	31	43	60
	60°	0.4	1.5	4.6	9	16.5	27	39	55	83	110
2 1/2"	30°*	0.4	1	4	8	12	18	28	37	62	75
	60°	0.4	1.5	5	10	21	34	53	75	103	150
3"	30°*	0.5	1.2	4	8	14	23	33	46	65	82
	60°	0.5	2.5	6	14	25	40	65	91	128	165
4"	30°*	0.6	2	6	15	29	48	71	100	130	159
	60°	0.7	3	11	25	40	59	90	141	212	356
6"	30°*	0.9	3.2	14	33	60	103	155	220	280	350
	60°	2	5	22	60	110	190	285	416	586	800

* 60° Balls as standard with 30° Ball by special order

Flow Rate for two way Full Bore ball valves (CV)

Size BSP	DN (mm)	CV when fully open
¼”	8	18
⅜”	10	20
½”	15	23
¾”	20	55
1”	25	95
1 ¼”	32	155
1 ½”	40	260
2”	50	440
2 ½”	65	710
3”	80	1050
4”	100	2040

 

3 way reduced port Threaded Ball Valves CV Values

SIZE	L-Port	T-Port	T-Port
		Through	Branch
1/4"	4.0	7.0	4.0
3/8"	5.0	9.0	4.0
1/2"	6.0	10.0	5.0
3/4"	16.0	21.0	13.0
1"	31.0	36.0	22.0
1-1/4"	32.0	58.0	25.0
1-1/2"	75.0	90.0	55.0
2"	140.0	175.0	100.0
2-1/2"	210.0	235.0	149.0
3"	375.0	450.0	270.0
4"	670.0	800.0	475.0