Two-stage ORVR control valve
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United States of America Patent
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Jan 19, 1999
Issued Date -
N/A
app pub date -
Dec 18, 1996
filing date -
Aug 24, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An onboard vapor recovery system for a vehicle fuel system having a fuel tank, a filler neck dynamically sealed by high pressure fuel flow from a filler nozzle, and a vapor recovery apparatus such as a carbon canister. The system includes a liquid level operated control valve 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 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 in the lower end of the filler pipe to prevent spitback of fuel from the pressurized tank once refueling has ceased.
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