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Vent control valving is described for an automotive fuel vapor recovery system, in which a baffle arrangement prevents or otherwise restricts liquid fuel from entering a vent passage to a charcoal canister. A sealing arrangement prevents or otherwise restricts the escape of fuel when the vehicle is

Vent control valving is described for an automotive fuel vapor recovery system, in which a baffle arrangement prevents or otherwise restricts liquid fuel from entering a vent passage to a charcoal canister. A sealing arrangement prevents or otherwise restricts the escape of fuel when the vehicle is turned at a sufficient rate of turn, operated on a sufficient incline, or rolled over, and prevents overfilling of the tank, which could allow liquid fuel to enter the vent passage. In one embodiment, a differential pressure is developed across a diaphragm during refueling which unseats the diaphragm from a seat to allow unrestricted venting during refueling, restricted venting is established whenever the diaphragm is seated to limited the flow of vapors to the canister.

대표청구항 ▼

[ We claim:] [1.] A vent control valving assembly adapted to mount on a fuel tank and form a portion of a fuel vapor recovery system for the fuel tank, said valving assembly comprising:a valve casing adapted to mount on the fuel tank to have at least a portion thereof extending downwardly into the f

[ We claim:] [1.] A vent control valving assembly adapted to mount on a fuel tank and form a portion of a fuel vapor recovery system for the fuel tank, said valving assembly comprising:a valve casing adapted to mount on the fuel tank to have at least a portion thereof extending downwardly into the fuel tank, said valve casing defining a hollow interior space and comprising a wall that is disposed across said valve casing hollow interior space and that has a vent opening for communicating with a vent outlet of the casing;a bottom piece closing a lower end of said valve casing, said bottom piece having at least one opening allowing fuel in the tank to enter said valve casing and rise to a fuel level corresponding to that in the fuel tank;a float slidably disposed in said valve casing; and,a seal assembly comprising a seal operable by said float for positioning against said valve casing wall by said float when said float has risen to a predetermined fuel level to seal said vent opening;said seal assembly including an equalizing orifice extending past said seal for allowing said seal to be released when said float falls as the fuel level in the tank declines below the predetermined level; andsaid float including a main portion slidable in said valve casing and a central tubular portion projecting from said main portion, and said seal assembly including a sleeve slidably received in said tubular portion, said seal being disposed on an upper end of said sleeve and resting on a top of said central tubular portion of said float.