Pumps – Condition responsive control of drive transmission or pump... – Plural pumps with individual or relative control
Patent
1977-11-07
1979-07-31
Croyle, Carlton R.
Pumps
Condition responsive control of drive transmission or pump...
Plural pumps with individual or relative control
60428, F04B 4900
Patent
active
041628748
ABSTRACT:
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 the displacement 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 the maximum 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.
REFERENCES:
patent: 3726093 (1973-04-01), Malott
patent: 3941513 (1976-03-01), Malott
patent: 3941514 (1976-03-01), Louis et al.
patent: 3945764 (1976-03-01), Marietta
patent: 4080979 (1978-03-01), Hein
Croyle Carlton R.
Look Edward
Parker-Hannifin Corporation
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