Pumps – With condition responsive pumped fluid control – Pressure responsive relief or bypass valve
Patent
1997-02-28
1998-09-01
Freay, Charles G.
Pumps
With condition responsive pumped fluid control
Pressure responsive relief or bypass valve
417307, 417269, F04B 4900
Patent
active
058001360
ABSTRACT:
A pump includes a housing having at least a first pumping chamber, an inlet, an inlet passage leading from the inlet to the pumping chamber, an outlet and an outlet passage leading from the pumping chamber to the outlet. A first pumping member is movable in the pumping chamber on an intake stroke whereby fluid from the inlet passage is drawn into the pumping chamber and on a discharge stroke whereby fluid in the pumping chamber is discharged into the outlet passage. A drive is provided for moving the pumping member on the intake and discharge strokes. A bypass passage leads from a location in the outlet passage to a location in the inlet passage. A bypass valve is provided and is movable in response to the pressure from the outlet passage and substantially independent of the pressure from the inlet passage between an open position in which fluid flows through the bypass passage and a closed position in which fluid is prevented from flowing through the bypass passage. Having a bypass valve movable only in response to the pressure from the outlet passage enhances the reliability and consistency of bypass valve operation.
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Kurth Brian J.
Patel Anil B.
Freay Charles G.
Shurflo Pump Manufacturing Co.
Tyler Cheryl J.
Uxa Frank J.
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