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Valves and the term Normally Closed.
The term Normally Closed (NC) applies to manual valves or dampers which the operator must leave closed in normal operation.
A control valve that should go to a closed position on a control signal failure should be labeled FC, i.e. Fail-Closed. The control signal may be pneumatic, hydraulic or electric.
Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators and positioners
A control valve that goes to closed position if control signal or air fails.
A control valve that should stay put if control signal or air fails.
A control valve that goes to open position if control signal or air fails.
Valves and the term Normally Open.
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