Combination lock and relief valve for hydraulic systems

Details Combination lock and relief valve for hydraulic systems Combination lock and relief valve for hydraulic systems

1975-01-06

1976-03-16

Cohan, Alan

Fluid handling

Line condition change responsive valves

Bi-directional flow valves

137495, 137509, 91420, 244 78, F16K 1722, F16K 3112

Patent

active

039439682

ABSTRACT:
A combination lock and relief valve in which a single valve poppet provides both functions. The combination valve is so arranged that the opening pressure of the poppet as a relief valve is independent of system pressure and remains constant regardless of system pressure variations. Moreover, when the poppet opens as a relief valve while the system pressure is on, the differential pressure across the poppet is relatively small whereby to minimize or eliminate erosion of the valve seat as occurs more readily when relief valve poppets are opened with high pressure differentials thereacross.

REFERENCES:
patent: 953403 (1910-03-01), Turner
patent: 1212951 (1917-01-01), Higinbotham
patent: 3137311 (1964-06-01), Rohweder et al.
patent: 3559534 (1947-09-01), Munro
patent: 3665810 (1972-05-01), Parrett
patent: 3792715 (1974-02-01), Parrett et al.
patent: 3807443 (1974-04-01), Jacobs
patent: 3857404 (1974-12-01), Johnson

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