Pump unloader and accumulator charging valve

Details Pump unloader and accumulator charging valve Pump unloader and accumulator charging valve

1979-08-02

1982-03-23

Cline, William R.

Power plants

Pressure fluid source and motor

With control means for structure storing work driving energy

137101, 137118, F16D 3102

Patent

active

043206220

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. A single spring acts to bias the spool into a first position against pressure in a control chamber into which fluid is pumped through a first one-way inlet valve. A second one-way exhaust valve located between the first one-way valve and an exhaust port can be opened by the slave to unload the pump.

REFERENCES:
patent: 2799995 (1957-07-01), Herman
patent: 3915186 (1975-10-01), Thomas
patent: 4060340 (1977-11-01), Yanik et al.
patent: 4173866 (1979-11-01), Farr

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