Pilot operated relief valve

Details Pilot operated relief valve Pilot operated relief valve

1991-08-06

1992-07-21

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

1374925, 137495, G05D 1604

Patent

active

051314274

ABSTRACT:
A pilot operated, balanced piston relief valve is provided with a body having a flow passageway therethrough and a main valve disposed therein, a pilot valve secured to the body and responsive to the pressure of fluid within the flow passage through the body, and a selective valve disposed between the body and the pilot valve for selectively discharging fluid from the body through a vent without requiring actuation of the pilot valve. In a preferred embodiment, the selective valve comprises an electrically actuatable cartridge valve secured within a manifold, with passageways formed through the manifold for providing fluid communication between the pilot valve, the main valve, and the vent.

REFERENCES:
patent: 2664916 (1954-01-01), Conley
patent: 3083726 (1963-04-01), Woelfel
patent: 3097665 (1963-07-01), Gauldie
patent: 3180355 (1965-04-01), Long
patent: 3270776 (1966-09-01), Carls
patent: 3613717 (1971-10-01), Smith
patent: 4535966 (1985-08-01), Post et al.

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