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  1. JackGardener

    Control valve actuator - spring and diaphragm Vs spring return piston

    Hi Compositepro, Thanks for your reply, but can we achieve class V shutoff at that high pressure with S&D actuator. Some colleagues say the pounds per linear square inch for this case will be very high and S&D actuator may not achieve the seat tightness. Thanks Jack
  2. JackGardener

    Actuator thrust calculation

    Hi, I wish to know if we can able to achieve class V shutoff with a spring and diaphragm actuator on a 900# globe control valve. Application is Gas lift. A colleague of mine told, best is select vendor offering piston with spring return actuator, as S&D actuator may not have thrust to achieve...
  3. JackGardener

    Control valve actuator - spring and diaphragm Vs spring return piston

    Hi all, A customer wants to buy control valves. Shutoff pressure is 130 barg. Each vendor is justifying his position, one says S&D is fine, another says piston spring return. Valve sizes from 4" to 8" rated 900# and above. I felt because of high shutoff pressure piston with spring would be a...

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