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Valves - Fail-Last (FL)

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A control valve which should stay put on the position on control signal failure should be labeled

  • FL - Fail-Last

The control signal may be pneumatic, hydraulic or electric.

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Related Topics

Control Valve Sizing

Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators, positioners and more.

Related Documents

Valves - Fail-Closed (FC)

A control valve that goes to closed position if control signal or air fails.

Valves - Fail-Open (FO)

A control valve that goes to open position 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.

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