Power plants – Pressure fluid source and motor – Having plural energy input means – pumps or diverse pump outlets
Patent
1991-12-19
1993-07-20
Look, Edward K.
Power plants
Pressure fluid source and motor
Having plural energy input means, pumps or diverse pump outlets
303 10, 417 5, 417287, 417288, F16D 3102, F04B 4106
Patent
active
052282899
ABSTRACT:
A pump system is disclosed which operates at high efficency in either a high volume, low pressure mode or a low volume, high pressure mode. First and second internal gear pumps are driven by a common drive shaft. The first pump has a smaller displacment than the second pump and both pumps deliver pressurized fluid to a common discharge passage. An unloading valve is operative to dump the output of the second pump in response to fluid pressure in the discharge passage so that it delivers fluid to the load device only when the pressure is below a predetermined value. The unloading valve also performs the function of a low capacity accumulator. A check valve is provided to prevent back flow in the outlet of the second pump.
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Look Edward K.
Ryznic John
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