Fluid handling – Systems – System with plural openings – one a gas vent or access opening
Patent
1988-04-04
1988-12-13
Rivell, John
Fluid handling
Systems
System with plural openings, one a gas vent or access opening
137393, 220 86R, 220 85VR, 220 85VS, 141 46, F16K 2400
Patent
active
047903490
ABSTRACT:
An apparatus is provided for controlling discharge of fuel vapor from the fuel tank having a filler neck during refueling. The apparatus includes a passage for conducting fuel vapor between the fuel tank and a distal portion of the filler neck and a valve for selectively blocking flow of fuel vapor through the conducting means. The valve is operable between a flow-blocking position and a flow-delivery position. A spring yieldably biases the blocking means away from its flow-blocking position to a flow-delivery position. An assembly defining a venting control chamber in communication with the valve is provided for using liquid fuel in the fuel tank to develop a pressure head in the venting control chamber having a magnitude in excess of a predetermined threshold level to exert a closing force on the valve in opposition to the spring so that the valve is moved to its flow-blocking position, thereby preventing discharge of pressurized fuel vapor in the tank to the filler neck through the passage.
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Rivell John
Stant Inc.
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