Check valve

Details Check valve Check valve

2008-05-06

2008-05-06

Krishnamurthy, Ramesh (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C137S540000, C251S337000, C267S180000

Reexamination Certificate

active

07367354

ABSTRACT:
A check valve includes a housing formed with a valve hole through which fluid flows, a valve seat formed on the peripheral wall of the valve hole, a valve element disposed in the valve hole to be movable between a valve closed position where the valve element makes close contact with the valve seat to close the valve hole and a valve open position where the valve element moves away from the valve seat in the downstream direction to open the valve hole, a coil spring for biasing the valve element toward the valve closed position wherein the coil spring is larger in outer diameter than valve element, and a pressure acting portion provided to the coil spring so as to undergo the pressure of fluid.

REFERENCES:
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patent: 3725990 (1973-04-01), Peterson et al.
patent: 4387715 (1983-06-01), Hakim et al.
patent: 4778354 (1988-10-01), Idei
patent: 4964391 (1990-10-01), Hoover
patent: 5107890 (1992-04-01), Gute
patent: 6971405 (2005-12-01), Pickelman
patent: 6981512 (2006-01-01), Meyer
patent: 24 49 994 (1975-05-01), None
patent: 60 164079 (1985-08-01), None
patent: 02 190681 (1990-07-01), None
patent: 09 250417 (1997-09-01), None
patent: 2775797 (1998-05-01), None

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