Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1978-01-23
1979-11-13
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
60418, 60494, 137115, F15B 102
Patent
active
041738667
ABSTRACT:
In an hydraulic system in which an hydraulic accumulator is charged with hydraulic fluid under pressure by means of an hydraulic pump which draws hydraulic fluid from a tank, and an unloader valve disposed in a supply line between the pump and the accumulator 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, and a pressure responsive slave which is operated by fluid pressure under the control of the control valve. The control valve comprises a valve member which is movable between a first position in which the accumulator is isolated from the slave so that pump pressure is supplied to the accumulator, and a second position in which fluid pressure from the accumulator can act on the slave to render the slave operative to reduce the pump pressure or disable the pump, and a cut-out spring for biassing the valve member at all times towards the first position. The valve member has different effective areas of which a smaller area is subjected to a control pressure dependent upon the pressure in the accumulator and in response to which the valve member can move at a cut-out point from the first position into the second position, and a greater area is subjected to the pressure in the accumulator, at least when the control member is in the second position, to determine a cut-in point at an accumulator pressure less than the pressure in the accumulator at the cut-out point and at which the control member can move from the second position into the first position.
REFERENCES:
patent: 2799995 (1957-07-01), Herman
patent: 3812675 (1974-05-01), Cochrane
patent: 3991570 (1976-11-01), Keller
Geoghegan Edgar W.
Girling Limited
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