Check valve

Details Check valve Check valve

2005-09-06

2005-09-06

Rivell, John (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C137S538000, C251S337000

Reexamination Certificate

active

06938641

ABSTRACT:
A check valve comprises: a pair of cylindrical body elements (1, 4) through which a fluid passes; a cylindrical valve element (7), which is disposed inside an upstream-side one (4) of the cylindrical body elements (1, 4), constantly subjected to a fluid pressure and biased toward its closed position under the influence of a resilient force exerted by a compression coil spring (10) coated with a tubular element; and, a stopper element (24) disposed in a downstream-side one (4) of the cylindrical body elements (1, 4). The check valve is characterized in that at least one of the cylindrical valve element (7) and the stopper element (24) is provided with a spiral seat portion (11) an axial spiral surface of which is brought into stable surface-contact with the compression coil spring (10) to support the compression coil spring (10) therein.

REFERENCES:
patent: 1101920 (1914-06-01), Garbutt
patent: 1814549 (1931-07-01), Fortune
patent: 2810397 (1957-10-01), Olson et al.
patent: 3695577 (1972-10-01), Jespersen
patent: 4195656 (1980-04-01), Kanerva et al.
patent: 5065790 (1991-11-01), Kornas

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