Power transmission

Details Power transmission Power transmission

1980-02-04

1981-08-25

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

1374925, F16K 31383

Patent

active

042853621

ABSTRACT:
A hydraulic pressure relief circuit including a main valve, a bleed flow orifice to provide stability to the main valve, a pilot valve having a differential area piston and a damping orifice in conjunction with an accumulator chamber. System pressure is limited by opening the main valve and allowing fluid flow from the system back to tank. The main valve is controlled as a bleed flow servo wherein the pilot valve meters the bleed flow from the bleed flow orifice to tank thereby controlling the opening of the main valve. Fluid flow through the damping orifice in conjunction with the accumulator chamber acts on the pilot valve to provide damping forces acting on the pilot valve with both rising and falling system pressures thereby limiting the maximum rate of pressure increase in the circuit.

REFERENCES:
patent: 2043453 (1936-06-01), Vickers
patent: 3143134 (1964-08-01), Karpis
patent: 3373763 (1968-03-01), Smilges
patent: 3578018 (1971-05-01), Dillon
patent: 3923075 (1975-12-01), Farrell
patent: 4083375 (1978-04-01), Johnson
patent: 4138929 (1979-02-01), Peterson

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