Hydraulic systems

Details Hydraulic systems Hydraulic systems

1978-08-29

1980-04-29

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

With control means for structure storing work driving energy

60418, F15B 102

Patent

active

041999410

ABSTRACT:
In an hydraulic system an unloader valve is located in a line between a pump and an hydraulic accumulator. The unloader valve is operative to prevent the accumulator from being overcharged and to allow the pump to re-charge the accumulator should the pressure stored therein fall below a desired minimum value. The unloader valve incorporates a control valve comprising a spool, and a pressure responsive slave which is operated by fluid pressure under the control of the control valve. Two springs bias the spool into a first position in which pump pressure can be supplied to the accumulator, and the second spring is inoperative when the spool is moved into a second position in which fluid pressure from the accumulator can act on the sleeve to reduce the pump pressure to that of the tank for the pump.

REFERENCES:
patent: 2264375 (1941-12-01), Hill et al.
patent: 2674092 (1954-04-01), Gardiner
patent: 3563033 (1971-02-01), Brewer

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