Diaphragm pump position control with offset valve axis

Details Diaphragm pump position control with offset valve axis Diaphragm pump position control with offset valve axis

2007-05-02

2010-02-23

Kramer, Devon C (Department: 3746)

Pumps

Motor driven

Fluid motor

C417S385000, C417S386000, C417S388000, C417S395000

Reexamination Certificate

active

07665974

ABSTRACT:
A hydraulically driven pump includes a diaphragm, a piston, a transfer chamber, a fluid reservoir, and a valve spool. The transfer chamber is defined between the diaphragm and piston and is filled with a hydraulic fluid. The fluid reservoir is in fluid communication with the transfer chamber via at least one valve. The valve spool is configured to control fluid flow between the transfer chamber and the fluid reservoir. The valve spool is movable to open and close an opening into the at least one valve only when an overfill condition or an underfill condition exists in the transfer chamber. The valve spool is moveable along an axis that is non-coaxial with an axis of movement of the diaphragm.

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