Pumps – With condition responsive pumped fluid control – Plural pump units with individual or relative control
Patent
1987-10-30
1989-05-23
Look, Edward K.
Pumps
With condition responsive pumped fluid control
Plural pump units with individual or relative control
417288, 417310, F04B 4900
Patent
active
048325791
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 displacement 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 pressure relief valve. A check valve is provided to prevent back flow in the outlet of the second pump.
REFERENCES:
patent: 3385312 (1968-05-01), Kinnamon et al.
patent: 3601506 (1971-08-01), Griswold
patent: 3635604 (1972-01-01), Petersen et al.
patent: 3916767 (1975-11-01), Barton
patent: 3968811 (1976-07-01), Fillion
patent: 4073140 (1978-02-01), Lang et al.
patent: 4171712 (1979-10-01), DeForrest
patent: 4199943 (1980-04-01), Hunt
patent: 4475442 (1984-10-01), Breeden
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