Vehicle ventilation valve with improved back flow prevention

Details Vehicle ventilation valve with improved back flow prevention Vehicle ventilation valve with improved back flow prevention

1994-09-30

1996-02-20

Joyce, Harold

Ventilation

Vehicle

Having outlet airway

137855, B60H 126

Patent

active

054925053

ABSTRACT:
A flap type vehicle ventilation valve improves sealing, while still preventing flap blowthrough, by insetting the surface of the blowthrough prevention valves from the plane of the vent opening. Therefore, under normal negative pressure, the flap can bulge inwardly from the plane of the vent opening, but not hit the webs, so that puckering of the flap and the consequent backflow leakage is prevented. The webs still hit the flap in response to high negative pressures, to avoid flap blowthrough.

REFERENCES:
patent: 4667578 (1987-05-01), Hagenah
patent: 4691623 (1987-09-01), Mizusawa
patent: 4781106 (1988-11-01), Frien
patent: 4989499 (1991-02-01), Scoccia et al.
patent: 5085132 (1992-02-01), Ikeda
patent: 5105731 (1992-04-01), Kraus
patent: 5263895 (1993-11-01), Kraus et al.

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