Check valve, auxiliary circulating device and method for...

Details Check valve, auxiliary circulating device and method for... Check valve, auxiliary circulating device and method for...

2006-10-17

2006-10-17

Krishnamurthy, Ramesh (Department: 3753)

Fluid handling

Processes

C137S528000, C137S533000, C137S565150

Reexamination Certificate

active

07121291

ABSTRACT:
A check valve includes a casing member, a tear-drop shaped ball member installed in the casing member, a latching member which is formed at an inner wall of the casing member and an airtight valve which is formed at an inner wall of the casing member. When forward flux occurs, the ball member is fixed at the latching members absolutely to circulate the forward flux stably. When backward flux occurs, the ball member is latched at the airtight member to close the casing member and thus, to suppress the backward flux.

REFERENCES:
patent: 2809660 (1957-10-01), Becker
patent: 3048165 (1962-08-01), Norton
patent: 3518702 (1970-07-01), La Russa
patent: 4813452 (1989-03-01), Smith
patent: 4902291 (1990-02-01), Kolff
patent: 5271898 (1993-12-01), Wolf et al.
patent: 5693091 (1997-12-01), Larson et al.
patent: 2004/0069353 (2004-04-01), Pickelman

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