Fluent material handling – with receiver or receiver coacting mea – Diverse fluid containing pressure filling systems involving... – Filling with exhausting the receiver
Patent
1994-08-31
1995-10-31
Jacyna, J. Casimer
Fluent material handling, with receiver or receiver coacting mea
Diverse fluid containing pressure filling systems involving...
Filling with exhausting the receiver
141 44, 141 46, 141302, 220 862, 137 43, 137589, F16K 1704
Patent
active
054621003
ABSTRACT:
A refueling vapor recovery system for a vehicle utilizes recirculation of a portion of the displaced vapor and combines a vapor vent valve and a recirculation control into a single differential pressure valve assembly. A vapor vent conduit provides fuel tank vapor pressure to one side of a diaphragm and, through a restricted orifice, to the other side of the diaphragm, the other side being further connected by a recirculation conduit to the tank filler neck. When a gas cap closes the filler neck from the atmosphere, the orifice allows pressure to equalize across the diaphragm; and a spring biases the diaphragm to close a vapor vent valve. When the gas cap is removed, atmospheric pressure is provided through the recirculation conduit to the other side of the diaphragm, which can then be activated by a relatively small differential pressure to open the vent for relatively unrestricted vapor flow from the tank to a canister during refueling, with a small portion of the vapor recirculated in a controlled flow through the orifice and recirculation conduit to the filler neck for entrainment in incoming liquid fuel.
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Covert Charles H.
Meyer Karen M.
Turner Kenneth W.
Wagner Richard W.
General Motors Corporation
Jacyna J. Casimer
Sigler Robert M.
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