Controlling vapor recirculation during refueling of a tank...

Details Controlling vapor recirculation during refueling of a tank... Controlling vapor recirculation during refueling of a tank...

B - Operations, Transporting

60

K

B60K 15/035 (2006.01) B67D 7/54 (2010.01) B60K 15/04 (2006.01)

Patent

CA 2472709

A two-stage pressure differential pressure responsive flow control valve (40) is disposed to provide greater fuel vapor recirculation to a tank filler tube (14) 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 (64) 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 (46, 50) with a float operated rollover valve (44).

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