from the Forum department...
Maximun Shutoff Differential in a valve
Engineering and workplace issues. topic
Posted by Biju on 31 May, 2011 - 3:59 am
What is the significance of Maximum DeltaP shut off for valves? Is it applicable for a Self regulated Valve? or only for ESD Shut off valves and Control valves? In some cases, the Max shut off Differential pressure is given as Design pressure. is it correct? Please guide

Posted by Asok Kumar Hait on 1 June, 2011 - 10:08 am
Maximum shut off DP is vital to size the actuator of the valve. If the DP is less, the actuator size will be small. As the DP increases, the actuator size also increases. If your valve actuator is not sized properly, when there is maximum DP across the valve (e.g., valve is fully closed), you may not be able to open the valve. This is equally important for regulators, control valves or shutdown valves.

Nomally at the initial design stage people are not sure what could be the maximum DP across the valve. One safe escape in that situation to consider the pipe line design pressure as the maximum DP across the valve. Because at any time the pressure in the pipe line will not be more than the design pressure of the pipe line.

Hope this helps.

Posted by Malik Azhar Mahmood on 20 November, 2013 - 5:52 am
Whether Maximum DP of ESD Valve be greater than Line Design Pressure? I have seen it in ESD Valves Data Sheets.

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