Pumps – With condition responsive pumped fluid control – Reversibly driven pump having bypass active in either flow...
Patent
1991-12-12
1992-11-10
Bertsch, Richard A.
Pumps
With condition responsive pumped fluid control
Reversibly driven pump having bypass active in either flow...
417310, F04B 4900
Patent
active
051619571
ABSTRACT:
An improved pump for providing pressurized fluid to a pressurized fluid operating device for opening and closing a door comprising having a pump housing with a pump chamber therein; a rotatable pumping element within the pump chamber; a pair of passages adapted for connection to a pressurized fluid operating device extending from the pump chamber to the exterior of the pump housing; means for driving the pump element in rotation; and a pair of pressure responsive bypass valves. The pump element is adapted to deliver pressurized fluid to either one of the pair of passages as determined by the sense of rotation of the pump element, with the other passage receiving the exhaust flow of pressurized fluid. Each of the pressure responsive bypass valves is connected to a different one of the pair of passages in the pump housing and is adapted to bypass pressurized fluid at a predetermined pressure setting. When connected to a passage receiving pressurized fluid from the pump cavity, each pressure responsive bypass valve will bypass pressurized fluid to the pump chamber in response to pressure within the passage exceeding a predetermined pressure setting, which can be selected for each of the passages as determined by the sense of rotation of the pump element.
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Basichas Alfred
Bertsch Richard A.
Vertran Manufacturing Company
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