Normally Closed (NC)

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.

Related Topics

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

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