F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
103/22
F04B 23/06 (2006.01) F04B 49/00 (2006.01)
Patent
CA 1106236
ABSTRACT OF THE DISCLOSURE Two variable displacement pumps each having a horsepower (or torque) control valve a pressure limiting valve, and a displacement feedback valve are interconnected to provide fluid flow paths from the high pressure zone of one pump to the low pressure zone of the other pump via the horsepower control valve and thedisplacement feedback valve of the respective pumps and vice versa. When one pump is utilizing less than one-half of the available engine torque as at deadhead operation or low displacement operation wherein its pressure limiting valve determines themaximum delivery pressure or wherein the pump is in standby operation, its displacement feedback valve will correspondingly increase the back pressure of the horsepower control valve of the other pump so that the latter may utilize the torque deficiency of the former to bring the total torque utilization of both pumps to the engine torque limit.
311164
Parker Michael James
Ridout & Maybee Llp
LandOfFree
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