Check valve device

Details Check valve device Check valve device

2005-09-27

2005-09-27

Rivell, John (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C137S535000, C137S543190, C251S337000, C251S368000

Reexamination Certificate

active

06948521

ABSTRACT:
A check valve device includes a valve section of a valve plug arranged in a fluid passage of a body, the valve plug being in a valve-opened state when separated from a seat section, and the valve plug being in a valve-closed state when seated on the seat section, and an elastic member which urges the valve section by the spring property of bent spring sections so that the valve section is seated on the seat section. The body, the valve plug, and the elastic member are formed of resin materials.

REFERENCES:
patent: 1227759 (1917-05-01), Day
patent: 1246892 (1917-11-01), Donnelly
patent: 2758609 (1956-08-01), Dickert et al.
patent: 2848157 (1958-08-01), Ayling
patent: 3084707 (1963-04-01), Frye
patent: 3176712 (1965-04-01), Ramsden
patent: 3302662 (1967-02-01), Webb
patent: 3749123 (1973-07-01), Fletcher et al.
patent: 4062378 (1977-12-01), Bender
patent: 4298023 (1981-11-01), McGinnis
patent: 4712583 (1987-12-01), Pelmulder et al.
patent: 5727594 (1998-03-01), Choksi
patent: 5873385 (1999-02-01), Bloom et al.

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