Saturday 29 June 2013

17. What action shall be taken if a electrical actuator trips on Torque limit switch upon start opening?

Normally in case of Globe valve where valve close will be limited by torque switch the valve will stop upon receiving open command by the activation of open torque switch. 
(operation solution) - Valve shall be open manually for one or more turns.
 ( Control solution) - The open torque switch shall be disabled for five percent.

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