Valves - Fail-Open (FO)
A control valve that goes to open position if control signal or air fails.
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
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Control Valve Sizing
Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators, positioners and more.
Related Documents
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Valves - Fail-Closed (FC)
A control valve that goes to closed position if control signal or air fails. -
Valves - Fail-Last (FL)
A control valve that should stay put if control signal or air fails. -
Valves - Normally Closed (NC)
Valves and the term Normally Closed. -
Valves - Normally Open (NO)
Valves and the term Normally Open.