Pilot operated check valve

Details Pilot operated check valve Pilot operated check valve

1974-02-20

1976-01-20

Nilson, Robert G.

Fluid handling

Self-proportioning or correlating systems

Supply and exhaust type

91420, F16K 1118

Patent

active

039331679

ABSTRACT:
A pilot operated check valve having pressure actuated poppet valves positioned to limit flow in one direction through each of two flow paths through the valve, each poppet valve including a one-way check valve to control reverse flow through the two flow paths and a spool positioned in said valve and being responsive to inlet pressure in one or the other of the flow paths to open the check valve in the opposite fluid flow path when the pressure differential between inlet pressure and return pressure is within a predetermined ratio.

REFERENCES:
patent: 2653626 (1953-09-01), Finlayson
patent: 3145734 (1964-08-01), Lee et al.
patent: 3272085 (1966-09-01), Hajma
patent: 3411521 (1968-11-01), Johnson

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