Sponsored Links
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.
Sponsored Links
Sponsored Links
SketchUp Engineering ToolBox - enabled for use with the amazing, fun and free Google SketchUp.
© The Engineering ToolBox 2005
8 5 9