Ball Valves

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
90 0.1 0.2 0.4 0.6 0.9 1.5 2.2 3.8 5.4 6.9
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
90 0.2 0.4 0.8 1.2 2 3.1 4.6 8 11.3 14
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
90 0.2 0.6 1.8 3.4 5.1 8.1 11.4 16 21 29
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
90 0.3 0.8 2 5 8 14 19 28 39 55
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
90 0.4 0.9 3.5 7 13 20 31 42 63 78
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
90 0.5 2 6 12 22 35 45 70 105 135
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
90 0.5 1.7 7 14 28 48 70 106 160 218
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
90 0.7 3.5 8 18 35 60 90 135 205 310
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
90 1 3.5 16 40 75 125 190 295 442 670
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
90 3 8 35 90 160 280 425 650 970 1480

 

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