Fail Open (FO)

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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.

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Related Topics

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

Related Documents

• Fail Closed (FC) - A control valve which should go to closed position on control signal or air failure would be labeled FC
• Fail Last (FL) - A control valve which should stay put on control signal or air failure would be labeled FL
• Normally Closed (NC) - The term Normally Closed
• Normally Open (NO) - The term Normally Open