Normally Closed (NC)

The term Normally Closed

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The term Normally Closed (NC) applies to manual valves or dampers which the operator must leave closed in normal operation.

A control valve which should go to closed position on control signal failure should be labeled FC, i.e. Fail Closed. 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 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
  • Fail Last (FL) A control valve which should stay put on control signal or air failure would be labeled FL

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