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Actuator MAST
How to Reduce Actuator MAST?

Hi,

I'm encountering a problem in my Project for the procurement of Pneumatic spring return ESD valves. In the Sizing calculations, for some valves the Actuator MAST is exceeding the Valve MAST, which I believe is not desirable.

I cannot change my DP on line & cannot reduce my safety factor (2). What is the solution now?

Can i proceed with Actuator MAST higher than Valve MAST?

Thanks in Advance!

Cheers

Having now understood MAST (Maximum allowable stem shear torque), it would seem a bad idea to have the Actuator MAST exceeding the Valve MAST as you could end up with a damaged valve.

Can you explain what calculations you are making?

If these are spring return, are they fail safe closed or fail safe open?

Not really my field, but I read this paper once and it covers issues with ESV MAST calcs and might provide a direction for you:

http://www.iceweb.com.au/Valve/SDV_BDV_ESD_Valves/NeedIndustry%20std.pdf