Unidirectional valves and methods of their use

Details Unidirectional valves and methods of their use Unidirectional valves and methods of their use

2006-05-09

2006-05-09

Rivell, John (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C137S015170, C454S358000

Reexamination Certificate

active

07040345

ABSTRACT:
The invention provides a flap valve for controlling the air pressure within a protected space defined by walls, the flap valve having a valve flap, articulated at least indirectly to the surface of one of the walls and being subjectable to both a sealing force which forces the valve flap against a valve seat surrounding an opening in the wall surface and to an opening force which lifts the flap off the valve seat. The flap valve has 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 a magnetic attraction between a portion of the surface of the valve flap and the valve seat. A method for controlling the air pressure within a protected space is also provided.

REFERENCES:
patent: 2782777 (1957-02-01), Jasper
patent: 4567816 (1986-02-01), Kolt
patent: 4691623 (1987-09-01), Mizusawa
patent: 5105849 (1992-04-01), Clough
patent: 6273127 (2001-08-01), Wade
patent: 56-28361 (1981-03-01), None
patent: 4-20729 (1992-04-01), None
patent: 4-110536 (1992-04-01), None

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