Relay indicator valve

Details Relay indicator valve Relay indicator valve

1977-12-23

1980-04-15

Schwadron, Martin P.

Fluid handling

Processes

137456, 251 26, F17D 300, F16K 17164

Patent

active

041978676

ABSTRACT:
A pneumatic relay valve is actuated by a pressure differential determined by the respective surface areas of two opposing surfaces of a piston moveable within the valve body. A first pressure (pilot signal) to be monitored maintains the piston member of the valve in its "in-service" position, blocking all ports in the valve body. Upon the occurrence of a sufficient pilot signal pressure drop, a second continuous common supply pressure moves the piston to a "tripped" position, sealing off the pilot signal inlet port to enable the second (common supply) pressure to bleed to the atmosphere. This sudden loss of common supply pressure causes a common supply relay valve to "trip," closing off all common supply fluid pressures to each of a plurality of first relay valves. Only upon reinstatement of the first interrupted pilot signal pressure may the relay valve be manually reset to the "in-service" position and maintained in that position by sufficient pilot signal pressure.

REFERENCES:
patent: 312724 (1885-02-01), Jarboe
patent: 3877484 (1975-04-01), Theriot et al.
patent: 3963050 (1976-06-01), Theriot et al.

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