Horsepower consumption control for variable displacement pumps

Details Horsepower consumption control for variable displacement pumps Horsepower consumption control for variable displacement pumps

F - Mech Eng,Light,Heat,Weapons

15

B

138/69.13

F15B 18/00 (2006.01) F04B 1/32 (2006.01) F04B 49/08 (2006.01)

Patent

CA 1168132

HORSEPOWER CONSUMPTION CONTROL FOR VARIABLE DISPLACEMENT PUMPS Abstract Flow-pressure compensated valves are employed in servo-systems for variable displacement pumps to maintain pump discharge pressure above a minimum pressure level and above the load pressure in a fluid actuator, during the working range of the pumps. In addition, such systems may also include a horsepower limiting valve for ensuring that the rating or predetermined range of horsepower consumption of the pumps is not exceeded. Commonly, systems continually bleed-off pump discharge or load pressure signals when horsepower requirements are exceeded which effect undesirable horsepower loss. A fluid circuit includes a horsepower limiting arrangement for blocking communication of an actuator pressure signal (PA) to an actuating chamber of a servo-system for a variable displacement pump and to vent the actuating pressure signal (PA) in response to a pressure control signal (PC) which indicates that the pump has exceeded its predetermined range of horsepower consumption.

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