Fail Open (FO)

A control valve which should go to the open position on control signal or air failure should be labeled FO

A control valve which should go to the open position on control signal failure should be labeled

  • FO - Fail Open

The control signal may be pneumatic, hydraulic or electric.

Related Topics

  • Control Valves - Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators and positioners

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