MD-W Gate Valve
The gate valve should always be in either full-open or full-closed postition. Leaving the gate valve partially open or throttling through the gate valve could result in damage to the gates and seats.
1. The valve is opened by turning the handwheel counterclockwise until it stops, then backing off 1/4 turn to relieve any stress in the operating mechanism.2. The valve is closed by turning the hand wheel clockwise until it stops, then backing off 1/4 to 1/2 turn to allow the gate to seal. The required torque may increase for the last few turns if there is a pressure differential across the gate.
Back to Valves
|
No of Valve
Revolutions |
Input Torque |
|||||
|
Size |
To Fully Open/Close |
To Crack Open |
Before Cracked
Open |
After Cracked
Open |
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|
ft-lb |
n*m |
ft-lb |
n*m |
|||
|
3-1/16", 20k psi |
15-3/4 |
3-1/3 |
112 |
152 |
22 |
30 |
|
4-1/6", 15k psi |
19 |
2-1/2 |
102 |
138 |
16 |
22 |
|
4-1/16", 20k |
21 |
4-1/2 |
177 |
240 |
22 |
30 |
|
5-1/8", 10k |
23-1/4 |
2-1/2 |
102 |
138 |
12 |
16 |
|
5-1/8", 15k |
24 |
3 |
176 |
239 |
16 |
22 |
|
6-3/8", 10k |
28-3/4 |
3 |
150 |
204 |
15 |
21 |
|
6-3/8", 15k |
15-1/4 |
2-1/2 |
401 |
544 |
21 |
29 |
|
7-1/16", 10k |
31 |
2-1/2 |
181 |
245 |
15 |
21 |
|
7-1/16", 15k |
16-5/8 |
2-1/2 |
451 |
612 |
21 |
29 |
|
9", 5k |
38-1/4 |
3 |
125 |
170 |
21 |
28 |
|
9", 10k |
20 |
2 |
381 |
516 |
21 |
28 |