Cv Valve
|
Valve Size
|
Disc Opening(Degree)
|
|
Inch
|
mm
|
Full
open
|
72
|
60
|
50
|
40
|
30
|
20
|
|
11/2
|
40
|
80
|
50
|
32
|
21
|
15
|
8
|
3
|
|
2
|
50
|
130
|
87
|
60
|
43
|
25
|
14
|
8
|
|
21/2
|
65
|
190
|
127
|
87
|
63
|
36
|
21
|
9
|
|
3
|
80
|
360
|
241
|
166
|
119
|
68
|
39
|
18
|
|
4
|
100
|
650
|
435
|
300
|
214
|
123
|
71
|
32
|
|
5
|
125
|
1,400
|
938
|
644
|
462
|
266
|
154
|
70
|
|
6
|
150
|
1,900
|
1,273
|
875
|
627
|
361
|
209
|
95
|
|
8
|
200
|
3.300
|
2,200
|
1,518
|
1,089
|
627
|
363
|
165
|
|
10
|
250
|
5,000
|
3,350
|
2,300
|
1,650
|
950
|
550
|
250
|
|
12
|
300
|
7,500
|
5,025
|
3,450
|
2,475
|
1,425
|
825
|
375
|
|
14
|
350
|
9,500
|
6,365
|
4,370
|
3,135
|
1,800
|
1,050
|
475
|
|
16
|
400
|
13,400
|
8,978
|
6,165
|
4,420
|
3,550
|
1,475
|
670
|
|
18
|
450
|
17,200
|
11,500
|
7,910
|
5,676
|
3,270
|
1,892
|
860
|
|
20
|
500
|
21,300
|
14,270
|
9,800
|
7,030
|
4,050
|
2,350
|
1,065
|
|
24
|
600
|
30,000
|
20,100
|
13,800
|
9,900
|
5,700
|
3,300
|
1,500
|
Cv is the water flow rate in U.S gallon per minute (USGPM) which pass through
the valve giving a pressure drop of 1 psi at a temperature of 68˚F. In metric
unit Kv in m3/h passing through the valve giving a pressure drop
of 1 bar at a temperature of 20°C. The relation between Cv and kv, expressed
in the above mentioned unit of measure is as follows
Cv = 1.16 Kv
The size of butterfly valve used for control purpose should be calculated on
basis of the operating characteristics In order to achieve optimum control,
the flow coefficient (Cv, Kv) below need to be considered
|
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