Double-acting valve unit

Details Double-acting valve unit Double-acting valve unit

2008-07-22

2008-07-22

Hepperle, Stephen M (Department: 3753)

Fluid handling

Line condition change responsive valves

Bi-directional flow valves

C137S493000, C137S565150, C417S250000, C417S253000

Reexamination Certificate

active

07401623

ABSTRACT:
A hydraulic system includes a charge pump which supplies fluid to variable displacement main pump, a fluid reservoir and valve unit. The valve unit includes a hollow housing having a first end communicated with the reservoir and a second end communicated with the charge pump and the main pump. A housing valve land member is located between the first and second ends. A valve member is movably mounted in the housing. The valve member has a valve disk attached to first and second valve stems which project from opposite sides of the valve disk. The valve disk has a central position wherein the valve disk is received by the ring. The valve stems are slidably supported by stem support members at opposite ends of the housing. A hollow sleeve projects from an end of the valve unit. A spring is mounted in the sleeve and is engagable with an end of one of the valve stems and is biased to urge the valve member away from the sleeve.

REFERENCES:
patent: 1798536 (1931-03-01), Hofman
patent: 1843449 (1932-02-01), Gangler
patent: 2565374 (1951-08-01), Kitchel
patent: 4503882 (1985-03-01), Brunner
patent: 5172716 (1992-12-01), Paptzun

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