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...

2006-06-06

2006-06-06

Maust, Timothy L. (Department: 3751)

Fluent material handling, with receiver or receiver coacting mea

Processes

Gas or variation of gaseous condition in receiver

C141S004000, C141S045000, C141S059000, C141S198000

Reexamination Certificate

active

07055556

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.

REFERENCES:
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patent: 6170538 (2001-01-01), Devall
patent: 6851458 (2005-02-01), Nakamura et al.

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