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FCI 87-2

Power Signal Standard for Spring-Diaphragm Actuated Control Valves

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Organization: FCI
Publication Date: 1 January 1990
Status: active
Page Count: 6
scope:

PURPOSE

This standard establishes a minimum signal range capable of operating control valves equipped with spring-opposed diaphragm actuators.

It is necessary to establish such a signal range to provide sufficient pressure below and above the corresponding bench settings of pneumatic actuators.

This will enable control valves with common bench ranges of 3 to 15 psi (or less) to close; especially when an electronic controller or computer signal reaches 4 mA (when valve fails closed) or 20 mA (when valve falls open).

Electropneumatic tranducers having 4 to 20 mA input, for example, should be calibrated to provide such a minimum power signal when operating diaphragm-actuated control valves.

Document History

FCI 87-2
January 1, 1990
Power Signal Standard for Spring-Diaphragm Actuated Control Valves
PURPOSE This standard establishes a minimum signal range capable of operating control valves equipped with spring-opposed diaphragm actuators. It is necessary to establish such a signal range to...

References

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