Onboard vapor recovery system with two-stage shutoff valve

Details Onboard vapor recovery system with two-stage shutoff valve Onboard vapor recovery system with two-stage shutoff valve

1996-09-13

1998-08-25

Jacyna, J. Casimer

Fluent material handling, with receiver or receiver coacting mea

Diverse fluid containing pressure filling systems involving...

Filling with exhausting the receiver

141 44, 141 46, 141302, 141198, 137 43, 137202, F16K 1704

Patent

active

057974349

ABSTRACT:
An onboard vapor recovery system for a vehicle fuel system having a fuel tank (10), a filler neck (12) dynamically sealed by high pressure fuel flow from a filler nozzle, and a vapor recovery apparatus such as a carbon canister (18). The system preferably uses an inventive liquid level operated control valve (20) which shuts off refueling with a two-stage closing operation providing an initial soft shutoff and a final shutoff. The system also preferably includes a valve (22) in the fuel tank to maintain a predetermined pressure head sufficient to hold the system closed against further refueling at least temporarily, and a positive action, one-way check valve (24) in the lower end of the filler pipe (12) to prevent spitback of fuel from the pressurized tank (10) once refueling has ceased.

REFERENCES:
patent: Re34518 (1994-01-01), Covert et al.
patent: 4974645 (1990-12-01), Johnson
patent: 5054520 (1991-10-01), Sherwood et al.
patent: 5065782 (1991-11-01), Szlaga
patent: 5322099 (1994-06-01), Langlois
patent: 5443561 (1995-08-01), Sakata et al.
patent: 5449029 (1995-09-01), Harris
patent: 5462100 (1995-10-01), Covert et al.

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