Fail Last (FL)

A control valve which should stay put on control signal or air failure would be labeled 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 Valves Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators and positioners

Related Documents

Normally Closed (NC) The term Normally Closed
Normally Open (NO) The term Normally Open
Fail Closed (FC) A control valve which should go to closed position on control signal or air failure would be labeled FC
Fail Open (FO) A control valve which should go to the open position on control signal or air failure should be labeled FO

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Engineering Standards

Engineering Standards