Pilot valve

Details Pilot valve Pilot valve

1975-11-06

1977-05-31

Cohan, Alan

Valves and valve actuation

Fluid actuated or retarded

Flexible wall expansible chamber reciprocating valve actuator

137489, 1375133, G05D 1616

Patent

active

040265137

ABSTRACT:
A pressure control valve wherein the monitored pressure acts against a diaphragm in opposition to a fixed biasing force which urges a poppet valve away from the seat. A disc with a small orifice therein covers a sensing port whereby flow of the monitored pressure into and out of the diaphragm chamber is retarded to minimize chatter of the diaphragm. A spring holding the orifice disc in place may be overcome by the monitored pressure to allow inward flow around the disc in the event that the orifice is occluded, whereby the valve will not enable undesirable pressure build up in the system in response to a false low pressure signal.

REFERENCES:
patent: 2930398 (1960-03-01), Barrett et al.
patent: 2938537 (1960-05-01), Silver et al.
patent: 3136329 (1964-06-01), Issbrucker
patent: 3276467 (1966-10-01), Case
patent: 3592223 (1971-07-01), Reese
patent: 3669142 (1972-06-01), Cerbic
patent: 3792713 (1974-02-01), Zadoo

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