Sheet 1000-4
North American Valves Cv Coefficients
The lack of a uniform method of sizing control valves led the Fluid Controls Institute to develop a valve capacity rating system which could be applied to all types of control valves, regardless of manufacturer. The heart of this system is the C v valve coefficient, which is a valve's capacity, in gpm of 60°F water, for 1 psi pressure drop. For flows of other fluids, refer to the appropriate North American valve bulletins.
The table below lists C v coefficients for most of North American's valves. Shutoff Valve Coef fi cients (Cv)
open 1821B CS/SST wide
1599 double wide
1599 single wide
Valve Cœfficient,
_-DV R950- 3690-
R950- 3690-
open 1821B-F wide
open 1821B wide
open 1857 wide
open 1842K wide
( (
( ( ( ( ( ( open open _-_
( ( (
(
( (
C V
-03 ( ¼ ") -02 ( 3⁄8 ") -01 ( ½ ") -0 ( ¾ ")
7.7
7.8
16.8
31.58
5.2
19
6.5
5.5
34.8
68.32
8.0
31
11.7
1098
6.94
-1
(1")
52.2
110.68
53
48
17
13.87
8.09
-2 (1 ¼ ") -3 (1 ½ ")
112.5
177.63
66
25.43
24.84
174.0
262.58
98
130
40.5
33.2
33.52
28.10
-4 (2")
255.2
492.34
486
155
220
60.7
40.5
46.24
31.67
-5 (2 ½ ")
350.3
843
270
310
89
73.2
75.14
68.20
-6 (3")
563.7
1277
340
510
113.3
110.5
92.48
70.52
-7
(4")
2055
520
870
171.6
171.09
-8 (6")
4923
740
324.9
364.14
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