Title: Load responsive system pump controls

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.

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Inventors: Budzich, Tadeusz (Moreland Hills, OH, US)

Application Number: 002844
Filing Date: 1979-01-11
Publication_date: 1980-04-29
Assignee:
Primary Class(es): 60/445 60/451, 60/452, 60/911
Other Classes:
US Patent Ref:

4139987

Feb, 1979

Budzich

60/445.

Other Refs:
Primary Examiner: Geoghegan, Edgar W.
Assistant Examiner:
Attorney: