Load responsive system pump controls

Details Load responsive system pump controls Load responsive system pump controls

1979-01-11

1980-04-29

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60451, 60452, 60DIG2, F16H 3946

Patent

active

041999444

ABSTRACT:
A load responsive fluid power control system using servo type flow control valves and fluid motors supplied by a variable displacement pump. The pump displacement is either regulated by an electro-hydraulic control valve in response to an electrical signal proportional to motor load or the pump displacement is regulated to maintain a constant discharge pressure. The flow of pressurized fluid from the pump is automatically cut off from a servo type valve controlling a negative or aiding load once this load exceeds a certain minimum level and the inlet flow requirement of the actuator is supplied from a low pressure source bypassing the servo valve.

REFERENCES:
patent: 4139987 (1979-02-01), Budzich

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