Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1978-03-02
1979-08-14
Rosenthal, Arnold
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
G05D 1610, F16K 31122
Patent
active
041643429
ABSTRACT:
Variable differential pressure control apparatus is used in a hydraulic system including a pump, an accumulator for receiving hydraulic fluid under pressure from the pump and for discharging hydraulic fluid to a work device, and an unloading valve in the circuit between the pump and the accumulator for regulating pressure of the fluid to the accumulator. The control apparatus is connected with the unloading valve for opening and closing the latter and is adjustable (1) for selectively setting the maximum fluid pressure to the accumulator and (2) for selectively setting the variation between the maximum pressure to the accumulator, at which pressure the unloading valve will open, and the minimum pressure to the accumulator at which pressure the unloading valve will close for recharging the accumulator.
REFERENCES:
patent: 2393571 (1946-01-01), Schultz
Double A Products Company
Rosenthal Arnold
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