Torques
|
Valve Size
|
Shut off Pressure in Bar
|
|
Inch
|
mm
|
3.5Bar
|
6Bar
|
10Bar
|
16Bar
|
|
11/2
|
40
|
11
|
11
|
12
|
14
|
|
2
|
50
|
14
|
20
|
23
|
25
|
|
21/2
|
65
|
18
|
25
|
27
|
29
|
|
3
|
80
|
27
|
32
|
34
|
37
|
|
4
|
100
|
40
|
41
|
54
|
56
|
|
5
|
125
|
59
|
62
|
71
|
86
|
|
6
|
150
|
88
|
92
|
106
|
123
|
|
8
|
200
|
157
|
173
|
186
|
262
|
|
10
|
250
|
248
|
275
|
321
|
392
|
|
12
|
300
|
343
|
382
|
576
|
551
|
|
14
|
350
|
485
|
549
|
680
|
1528
|
|
16
|
400
|
662
|
766
|
882
|
2035
|
|
18
|
450
|
882
|
1029
|
1265
|
2490
|
|
20
|
500
|
1142
|
1327
|
1634
|
3070
|
|
24
|
600
|
2385
|
2787
|
3250
|
5670
|
The torques listed are applicable to water, sea water, lubricating type of hydrocarbons and most media at temperature 0~82°C(32~180°F).
The operating speed of the actuator must be considered in order to avoid water hammer when the valve is closed in junction with liquid.
The factors affect the torque required to operate Butterfly Valves
- Valve Diameter
- Shaft Diameter
- Bearing Friction Coefficient
- Type of Seat Material
- Shut-off Pressure
- Velocity
- Shape of Disc
- System Head Characteristics
- Piping Arrangement
Actuator torques can be calculated using the following formula
|
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