Diaphragm position control for hydraulically driven pumps

Details Diaphragm position control for hydraulically driven pumps Diaphragm position control for hydraulically driven pumps

2005-04-26

2008-09-16

Kramer, Devon (Department: 3746)

Pumps

Motor driven

Fluid motor

C417S388000, C417S386000, C417S395000

Reexamination Certificate

active

07425120

ABSTRACT:
A hydraulically driven pump includes a diaphragm, a piston, a transfer chamber, a fluid reservoir, and a spool member. 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 spool member is configured to control fluid flow between the transfer chamber and the fluid reservoir. The spool member 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.

REFERENCES:
patent: 2919650 (1960-01-01), Wiggermann
patent: 3769879 (1973-11-01), Lofquist
patent: 3884598 (1975-05-01), Wanner
patent: 4050859 (1977-09-01), Vork
patent: 4416599 (1983-11-01), De Longchamp
patent: 4865528 (1989-09-01), Fritsch et al.
patent: 4883412 (1989-11-01), Malizard et al.
patent: 5246351 (1993-09-01), Horn
patent: 5667368 (1997-09-01), Augustyn et al.
patent: 6071089 (2000-06-01), Maier et al.

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