Flapper actuated pilot valve

Details Flapper actuated pilot valve Flapper actuated pilot valve

1988-10-06

1989-10-24

Cohan, Alan

Fluid handling

Systems

Sequentially closing and opening alternately seating flow...

137 85, 137596, 137488, G05D 1600, F16K 1104

Patent

active

048755028

ABSTRACT:
A flapper actuated pilot valve is shown is which the output pressure from the valve is dependent upon and proportional to the force exerted by the flapper. The valve includes a valve body with upper and lower chambers and an interconnecting gas passage. A spring-biased poppet in the lower chamber has a primary sealing surface for sealing off the lower chamber and a secondary sealing surface which is contacted by a flapper element located in the upper chamber. The flapper element has an interior bore leading to an exhaust port in the upper end of the flapper element which extends through an opening in the valve body. The flapper element also extends through a central opening provided in a cupped seal in the upper chamber. The cupped seal and primary and secondary sealing areas of the flapper element cooperate to provide and outlet gas pressure which is proportional to the external force supplied by the flapper upon the flapper element.

REFERENCES:
patent: 2752947 (1956-07-01), Hruska
patent: 2942623 (1980-06-01), Schwartz

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