Fluid controlled pumping system and method

Details Fluid controlled pumping system and method Fluid controlled pumping system and method

2005-09-20

2005-09-20

Freay, Charles G. (Department: 3746)

Pumps

With condition responsive pumped fluid control

Bypass or relief valve carried by movable pumping member

C417S300000, C418S048000, C166S068000

Reexamination Certificate

active

06945755

ABSTRACT:
A fluid level controlled pumping system includes a pumping unit disposed within a fluid cavity. The pumping unit includes an inlet operable to receive a fluid to be pumped from the fluid cavity. The system also includes a valve slidably coupled to the pumping unit. The valve includes a passage for receiving pumped fluid from an outlet of the pumping unit. In response to a decreasing fluid level within the fluid cavity, movement of the valve relative to the pumping unit aligns the passage with a port of the pumping unit to recirculate the pumped fluid from the outlet to the inlet.

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