Check valve structure for use in pump of hydraulic cylinder

Details Check valve structure for use in pump of hydraulic cylinder Check valve structure for use in pump of hydraulic cylinder

2007-07-30

2011-11-15

Hepperle, Stephen M (Department: 3753)

Fluid handling

Self-proportioning or correlating systems

Supply and exhaust type

C137S538000

Reexamination Certificate

active

08056575

ABSTRACT:
A check valve for use in a pump of a hydraulic cylinder includes a tubular member having a sheath member received therein. The pump includes a chamber provided in an output pipe thereof for receiving the check valve. The tubular member is constructed in the form of a hollow cylinder and includes a sealing sleeve fitted therearound. The tubular member includes an oil seal mounted on the front end thereof for the engagement with a hollow screw element in the chamber. The sheath member includes a hollow cap member, a first spring element, a ball, a hollow disc element, and a second spring element which are placed into the tubular member in turn. By using the hollow disc element and the second spring element, the tubular member may be fixed in the chamber, and by way of the screw element, the tubular member is enclosed in the chamber.

REFERENCES:
patent: 2252418 (1941-08-01), Shelley
patent: 2270549 (1942-01-01), Orr
patent: 2610859 (1952-09-01), Wilcox et al.
patent: 2816563 (1957-12-01), Pappas
patent: 3246663 (1966-04-01), Jakowchuk
patent: 3314440 (1967-04-01), Horowitz
patent: 3464321 (1969-09-01), Piotrowski, Jr.
patent: 3818929 (1974-06-01), Braukmann
patent: 4041970 (1977-08-01), Peters
patent: 6079519 (2000-06-01), Lottes

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