Unidirectional, adjustable flap valves

Details Unidirectional, adjustable flap valves Unidirectional, adjustable flap valves

2007-03-27

2007-03-27

Krishnamurthy, Ramesh (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C137S527400, C251S337000

Reexamination Certificate

active

10765179

ABSTRACT:
The invention provides a flap valve for controlling the air pressure within a protected space defined by walls, the flap valve including a valve frame attachable to an opening made in the walls, a valve flap, articulated at least indirectly to the frame and being subjectable to both a sealing force which forces the valve flap against the valve frame and to an opening force which lifts a portion of the flap off the valve frame; the flap valve having a first position in which the protected space is sealed off from a contaminated environment, and a second position in which air from the protected space is allowed to escape into the environment via the opening, wherein the sealing force is constituted by at least one spring at least indirectly attached to the valve flap and the valve frame.

REFERENCES:
patent: 2767735 (1956-10-01), Darling
patent: 3172424 (1965-03-01), Stillwagon
patent: 3665958 (1972-05-01), Dunkelis
patent: 3974855 (1976-08-01), Webb
patent: 3990471 (1976-11-01), Schutzer et al.
patent: 4088150 (1978-05-01), Serratto
patent: 4678341 (1987-07-01), Stuckey
patent: 5494244 (1996-02-01), Walton
patent: 6705593 (2004-03-01), Deaton
patent: 3540264 (1987-05-01), None
patent: 19849863 (1999-05-01), None
patent: 0864821 (1998-09-01), None
patent: 2330772 (1999-05-01), None

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