Relief valve

Details Relief valve Relief valve

1995-11-30

1998-08-11

Hepperle, Stephen M.

Fluid handling

Line condition change responsive valves

Safety cut-off requiring reset

137474, 137490, 137508, 1375123, 1376142, F16K 1710

Patent

active

057913722

ABSTRACT:
The invention intends to provide a relief valve which can prevent malfunction caused by generation of negative pressure lowering the minimum pressure to be originally maintained by a load circuit.
Maloperation of a relief valve 401 is prevented by allowing a check valve 423 for preventing a backflow from a main valve element 410 and pilot valve element 412 side to a load port side 402 to be intervened at a pressure chamber 408 between a load port 406 connected to a load circuit, a main valve element 410, and a pilot valve element 412 and by applying a hydraulic lock when negative pressure lower than the minimum pressure to be originally maintained by a load circuit is generated. And by communicating a downstream chamber 425 downstream of the check valve 423 to a return port 407 with a reset oil passage 429 which is opened and closed by a reset valve 430, the hydraulic lock is designed to be released.

REFERENCES:
patent: 854047 (1907-05-01), Leber
patent: 3040771 (1962-06-01), Droitcour et al.
patent: 3054420 (1962-09-01), Williams
patent: 5676172 (1997-10-01), Mukumoto

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