Check valve

Details Check valve Check valve

2005-11-29

2005-11-29

Krishnamurthy, Ramesh (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C137S542000, C137S540000, C137S539000, C251S284000

Reexamination Certificate

active

06968858

ABSTRACT:
The check valve according to the invention significantly reduces the generation of noise by producing an asymmetrical circulation around the closing body causing a force resulting from the flow and acting on the closing body to have a transverse component in relation to the opening direction, as a result of which increased friction and damping are generated in the closing body guide. The closing body may be asymmetrically embodied, or the housing wall encompassing the closing body may be provided with a conduit extending in the opening direction over at least a part of the travel path of the closing body.

REFERENCES:
patent: 3664368 (1972-05-01), Sweeney
patent: 3765447 (1973-10-01), Cornell
patent: 4286622 (1981-09-01), Ninomiya et al.
patent: 4700741 (1987-10-01), Murphy
patent: 5251664 (1993-10-01), Arvidsson et al.
patent: 5421306 (1995-06-01), Talaski
patent: 5595213 (1997-01-01), Brown
patent: 6401749 (2002-06-01), Tai et al.
patent: 40 29 909 (1992-03-01), None

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