High pressure pump with a flow control valve

Pumps – With condition responsive pumped fluid control – Pressure responsive relief or bypass valve

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F04B 4900

Patent

active

045539081

ABSTRACT:
A rotary slide vane pump for steering booster systems has a flow control valve which bypasses flow from outlet side to suction side with increase in speed as heretofore known. The flow channels or passages that conduct bypass flow change the direction of the flow at a juncture point between passages, such directional change being a right angle, radially downstream from the bypass valve to longitudinally at the point of juncture to the suction side, likewise as heretofore known. In the present invention there is provided a transition piece between the channels at the right angle juncture in the form of a screw in the pump body and having a flat face disposed flush with the longitudinal channel and transversely of the radial channel. The provision of such transition piece has been found to effect an increase in suction pressure when bypass flow is added to normal suction flow, such increase being over and above that effected by the prior art. The result is an enhanced suction volume in pump operation, avoidance of cavitation damage due to insufficient intake filling and reduction of noise.

REFERENCES:
patent: 2118234 (1938-05-01), Rupp
patent: 2782718 (1957-02-01), Pettibone

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