Fuel cap having a fuel tank pressure regulating valve

Details Fuel cap having a fuel tank pressure regulating valve Fuel cap having a fuel tank pressure regulating valve

2004-09-02

2009-08-25

Hylton, Robin (Department: 3781)

Receptacles

Closures

With condition responsive vent or valve

C220S203260, C220S303000, C220S304000, C220SDIG033

Reexamination Certificate

active

07578405

ABSTRACT:
A fuel cap of the invention has a pressure regulating valve, which includes a positive pressure valve and a negative pressure valve. The positive pressure valve has a positive pressure valve plug and a first spring. The negative pressure valve has a negative pressure valve plug and a second spring. A ring-shaped projection is protruded outward from the upper circumferential end of the negative pressure valve plug to face a first valve flow path, and functions as a restriction member. The restriction member narrows the passage area of the first valve flow path in a closed position of the negative pressure valve plug, while widening the passage area of the first valve flow path in an open position of the positive pressure valve plug where the negative pressure valve plug moves integrally with the positive pressure valve plug. This arrangement effectively improves the flow characteristics of the pressure regulating valve in the open position of the positive pressure valve.

REFERENCES:
patent: 4498493 (1985-02-01), Harris
patent: 4785961 (1988-11-01), Kasugai et al.
patent: 5279439 (1994-01-01), Kasugai et al.
patent: 5975328 (1999-11-01), Hagano et al.
patent: 5996829 (1999-12-01), Hagano et al.
patent: 1 332 979 (2003-08-01), None
patent: A-10-278958 (1998-10-01), None
patent: WO 00/69722 (2000-11-01), None
European Search Report dated Aug. 13, 2007 in corresponding European Patent Application No. 04020927.2-1523.

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