Controlling vapor recirculation during refueling of a tank through a filler tube from a dispensing nozzle
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United States of America Patent
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Jun 6, 2006
Grant Date -
Jan 6, 2005
app pub date -
Jul 2, 2003
filing date -
Jul 2, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A two-stage pressure differential pressure responsive flow control valve is disposed to provide greater fuel vapor recirculation to a tank filler tube when high vacuum conditions are encountered during refueling from a fuel dispensing nozzle inserted in the filler tube. The pressure responsive valve has an obturator with a passage therethrough for providing a relatively low flow rate when the valve is in the closed condition resulting from a relatively low vacuum during refueling. When a higher vacuum is encountered, the obturator is moved to the open position permitting greater flow. Preferably, the pressure responsive valve is disposed in a common housing with a float operated rollover valve.
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