Hydraulic systems

Details Hydraulic systems Hydraulic systems

1981-02-09

1983-02-01

Yuen, Henry C.

Pumps

With condition responsive pumped fluid control

Expansible chamber pump distributor operation modified

417307, F04B 4908

Patent

active

043713173

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 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 valve. A second valve in series with the first valve is located between the first valve and an exhaust port for connection to a tank for fluid. The slave comprises inner and outer concentric piston parts which are relatively movable axially and of which the inner part is adapted to open the valve to unload the pump.

REFERENCES:
patent: 2387117 (1945-10-01), Buehler, Jr.
patent: 2684631 (1954-07-01), Anthony et al.
patent: 3316926 (1967-05-01), Worth
patent: 3834837 (1974-09-01), Nickell

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