Controlling vapor recirculation during refueling of a tank through a filler tube from a dispensing nozzle
First Claim
1. A system for controlling fuel vapor recirculation during refueling of a tank from a dispensing nozzle, the system comprising:
- (a) a filler tube with a means for sealing about the nozzle;
(b) a means defining a vapor recirculation path from the tank to the filler tube at a location downstream of said means for sealing about the nozzle;
(c) a vapor storage device disposed externally of the tank and connected to receive fuel vapor 1mm the tank; and
,(d) a flow control valve disposed In said recirculation path, said flow control valve responsive to a predetermined pressure differential across the valve to change from a first flow rate to a second flow rate higher than the first flow rate.
2 Assignments
0 Petitions
Accused Products
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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Citations
14 Claims
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1. A system for controlling fuel vapor recirculation during refueling of a tank from a dispensing nozzle, the system comprising:
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(a) a filler tube with a means for sealing about the nozzle; (b) a means defining a vapor recirculation path from the tank to the filler tube at a location downstream of said means for sealing about the nozzle; (c) a vapor storage device disposed externally of the tank and connected to receive fuel vapor 1mm the tank; and
,(d) a flow control valve disposed In said recirculation path, said flow control valve responsive to a predetermined pressure differential across the valve to change from a first flow rate to a second flow rate higher than the first flow rate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of controlling fuel vapor recirculation during refueling of a tank from a dispensing nozzle comprising:
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(a) providing a tank filler tube with a nozzle receiving cup end disposing an annular seal in the cup and sealing about the nozzle upon insertion therein; (b) providing a vapor recirculation passage from the tank to the filler tube cup downstream of the nozzle seal; (c) disposing a pressure responsive flow control valve in said recirculation passage and changing the rate of flow in said passage from a first rate to a second rate higher than the first rate when said valve experiences a predetermined pressure differential thereacross. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification