Control valve failure and de-energized position indications
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  • Create Date May 19, 2023
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Control valve failure and de-energized position indications

Control valve failure and de-energized position indications
– Fail to open position.
– Drift open.
– Fail at last position.
– Drift closed.
– Fail at last position.

  CONTROL VALVE     Drift closed     Drift open     Fail at last     Fail to open     Instrument     Legend     process     Symbol  
Final control element actuator symbols
Actuator Pneumatic Symbols