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  1. GrayD

    Partial Valve Stroke Test on a FL Double Acting Actuator

    Ashereng Yes, it sounds confusing doesn't it? Let me try again. A PVST isn't carried out on a closed valve, therefore on a process trip in FL position, the valve is closed and remains closed. Dito on valve failure. However, a PVST is carried out on a valve in the open position and in the...
  2. GrayD

    Partial Valve Stroke Test on a FL Double Acting Actuator

    Ashereng Thanks for your reply. For our spring return valves the actuator's spring(s) trigger the respective FO & FC valves to their failure positions accordingly. However my concern is that the FL actuators may fail in a semi closing position with mitigating circumstances as the FL...
  3. GrayD

    Partial Valve Stroke Test on a FL Double Acting Actuator

    Hi Does anyone have any ideas how to hook-up a pneumatic Fail Last Double acting actuator so that if performing a PVST that it shall return to the Fail Open position again on loss of air or power? Thanks in advance Graham

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