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A system and method for controlling evaporative emissions of a volatile fuel. The system preferably has a fuel vapor collection canister, a purge valve, an isolation valve, a fuel tank, and a vent valve. The fuel vapor collection canister includes a supply port and a discharge port. The purge valve

A system and method for controlling evaporative emissions of a volatile fuel. The system preferably has a fuel vapor collection canister, a purge valve, an isolation valve, a fuel tank, and a vent valve. The fuel vapor collection canister includes a supply port and a discharge port. The purge valve includes an inlet port and an outlet port. The inlet port of the purge valve is in fluid communication with the discharge port of the fuel vapor collection canister. The isolation valve includes a housing, a valve body, and a seal. The housing has a first port in fluid communication with the supply port of the fuel vapor collection canister, a second port, and a fuel vapor flow path that extends between the first and second ports. The valve body is movable with respect to the housing along an axis between a first configuration and a second configuration. The first configuration permits substantially unrestricted fuel vapor flow between the first and second ports, and the second configuration substantially prevents fuel vapor flow between the first and second ports. The seal, which is located at an interface between the housing and the valve body, includes an annular lip that projects obliquely toward the axis in the first configuration. The fuel tank is in fluid communication with the second port of the isolation valve. Thus, the fuel tank can be isolated from the fuel vapor collection canister while purging the fuel vapor collection canister. The vent valve controls ambient fluid flow with respect to the fuel vapor collection canister

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A system and method for controlling evaporative emissions of a volatile fuel. The system preferably has a fuel vapor collection canister, a purge valve, an isolation valve, a fuel tank, and a vent valve. The fuel vapor collection canister includes a supply port and a discharge port. The purge valve

A system and method for controlling evaporative emissions of a volatile fuel. The system preferably has a fuel vapor collection canister, a purge valve, an isolation valve, a fuel tank, and a vent valve. The fuel vapor collection canister includes a supply port and a discharge port. The purge valve includes an inlet port and an outlet port. The inlet port of the purge valve is in fluid communication with the discharge port of the fuel vapor collection canister. The isolation valve includes a housing, a valve body, and a seal. The housing has a first port in fluid communication with the supply port of the fuel vapor collection canister, a second port, and a fuel vapor flow path that extends between the first and second ports. The valve body is movable with respect to the housing along an axis between a first configuration and a second configuration. The first configuration permits substantially unrestricted fuel vapor flow between the first and second ports, and the second configuration substantially prevents fuel vapor flow between the first and second ports. The seal, which is located at an interface between the housing and the valve body, includes an annular lip that projects obliquely toward the axis in the first configuration. The fuel tank is in fluid communication with the second port of the isolation valve. Thus, the fuel tank can be isolated from the fuel vapor collection canister while purging the fuel vapor collection canister. The vent valve controls ambient fluid flow with respect to the fuel vapor collection canister al., 123/456; US-6082333, 20000700, Vattelana et al., 123/456; US-6167699, 20010100, Johnston et al., 060/304; US-6189510, 20010200, Jaeger et al., 123/468; US-6205979, 20010300, Sims, Jr. et al., 123/456; US-6213096, 20010400, Kato et al., 123/456; US-6213243, 20010400, Studebaker et al., 180/314; US-6227170, 20010500, Koshiba, 123/456; US-6253739, 20010700, Golomb et al., 123/509; US-6314942, 20011100, Kilgore, 123/467; US-6371083, 20020400, Rossi et al., 123/456; US-6401691, 20020600, Kawano et al., 123/456 730700, Kolb, 048/189.4; US-3826235, 19740700, Pasbrig; US-3848665, 19741100, Uerlichs et al.; US-4086899, 19780500, Gaylord; US-4092966, 19780600, Prosen, 048/189.4; US-4094290, 19780600, Dismuke; US-4153029, 19790500, Ikegaya, 048/189.4; US-4215663, 19800800, Gaylord; US-4711225, 19871200, Holderle et al.; US-4744340, 19880500, Kirby; US-4779584, 19881000, Mosler; US-5094200, 19920300, Fontichiaro; US-5099808, 19920300, Matsuura et al.; US-5392752, 19950200, Brogan et al.; US-5632145, 19970500, Hunt, 123/306; US-6073609, 20000600, Buswell et al., 123/590; US-6170460, 20010100, Buswell et al.