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A vent valve for use with a fuel containing system including a fuel tank and a vapor recovery system. The vent valve includes a housing which communicates with the fuel tank and the vapor recovery system. The housing defines a path between the fuel tank and vapor recovery system. A float valve is po

A vent valve for use with a fuel containing system including a fuel tank and a vapor recovery system. The vent valve includes a housing which communicates with the fuel tank and the vapor recovery system. The housing defines a path between the fuel tank and vapor recovery system. A float valve is positioned in the housing and is responsive to the presence of fuel in the tank. The housing has at least one vacuum vent positioned in the path. An umbrella valve is carried on the housing and positioned between the fuel tank and the vapor recovery system. The umbrella valve has a wall defining an orifice extending therethrough and a cover portion extending from the wall. The orifice is selectively sealed at one end by the float valve and is selectively sealed at the opposite end by the head valve. The covering portion of the umbrella valve displaceably overlies the vacuum vent for preventing passage of liquid fuel and fuel vapor through the vent when the force against the covering portion is generally positive relative to the fuel vent and covering portion. The covering portion allows passage of liquid fuel and fuel vapor through the vent when the force on the covering portion is greater than the resisting force of the covering portion there against.

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A vent valve for use with a fuel containing system including a fuel tank and a vapor recovery system. The vent valve includes a housing which communicates with the fuel tank and the vapor recovery system. The housing defines a path between the fuel tank and vapor recovery system. A float valve is po

A vent valve for use with a fuel containing system including a fuel tank and a vapor recovery system. The vent valve includes a housing which communicates with the fuel tank and the vapor recovery system. The housing defines a path between the fuel tank and vapor recovery system. A float valve is positioned in the housing and is responsive to the presence of fuel in the tank. The housing has at least one vacuum vent positioned in the path. An umbrella valve is carried on the housing and positioned between the fuel tank and the vapor recovery system. The umbrella valve has a wall defining an orifice extending therethrough and a cover portion extending from the wall. The orifice is selectively sealed at one end by the float valve and is selectively sealed at the opposite end by the head valve. The covering portion of the umbrella valve displaceably overlies the vacuum vent for preventing passage of liquid fuel and fuel vapor through the vent when the force against the covering portion is generally positive relative to the fuel vent and covering portion. The covering portion allows passage of liquid fuel and fuel vapor through the vent when the force on the covering portion is greater than the resisting force of the covering portion there against. eeth opposing the magnetic pole surfaces. The first pole teeth and the second pole teeth are alternately disposed. The first pole teeth of the first yoke are shifted by a predetermined pitch circumferentially from the second pole teeth of the second yoke. The electromagnetic coil block includes electromagnetic coils. A first electromagnetic coil and a second electromagnetic coil have a magnetic input-output end opposing, via air gap, the first pole tooth ring and the second pole tooth ring of the first yoke and second yoke. rolling intake gas flow or exhaust gas flow of an internal combustion engine, comprising: a valve driving portion including a magnetic path which comprises: a magnetic flux generating element comprising an electromagnetic coil wound so as to generate a magnetic flux; and a magnetic field generating element comprising three pole members to distribute the magnetic flux and form at least one magnetic field; a magnetized member that is movable within said magnetic field in cooperation with a valve rod that is integral with a valve element, said magnetized member having two magnetized surfaces with different polarities; and a current supply for supplying a driving current to said electromagnetic coil so as to correspond to a valve opening direction and a valve closing direction; wherein said three pole members are aligned in a lengthwise direction of said valve rod; wherein said electromagnetic coil is wound about an axis perpendicular to the lengthwise direction; and wherein said magnetized member comprises a plurality of permanent magnets spaced from each other in the lengthwise direction of said valve rod and said two magnetized surfaces with different polarities are spaced from each other in the lengthwise direction. 4. A valve driving apparatus for driving a valve element controlling intake gas flow or exhaust gas flow of an internal combustion engine, comprising: a valve driving portion including a magnetic path which comprises: a magnetic flux generating element comprising an electromagnetic coil wound so as to generate a magnetic flux; and a magnetic field generating element comprising three pole members to distribute the magnetic flux and form at least one magnetic field; a magnetized member that is movable within said magnetic field in cooperation with a valve rod that is integral with a valve element, said magnetized member having two magnetized surfaces with different polarities; a current supply for supplying a driving current to said electromagnetic coil so as to correspond to a valve opening direction and a valve closing direction; wherein said three pole members are aligned in a lengthwise direction of said valve rod; wherein said electromagnetic coil is wound about an axis perpendicular to the lengthwise direction; a support holding said valve driving portion and said magnetized member that is movable within said magnetic field in cooperation with said valve rod for movement relative to said valve driving portion; wherein said magnetized portion is supported by a plurality of rollers on said support for movement in the lengthwise direction; and wherein said support and said magnetized member comprise respective grooves receiving said rollers therein, said grooves restricting motion of said rollers to the lengthwise direction. 5. A valve driving apparatus for driving a valve element controlling intake gas flow or exhaust gas flow of an internal combustion engine, comprising: a valve driving portion including a magnetic path which comprises: a magnetic flux generating element comprising an electromagnetic coil wound so as to generate a magnetic flux; and a magnetic field generating element comprising three pole members to distribute the magnetic flux and form at least one magnetic field; a magnetized member that is movable within said magnetic field in cooperation with a valve rod that is integral with a valve element, said magnetized member having two magnetized surfaces with different polarities; a current supply for supplying a driving current to said electromagnetic coil so as to correspond to a valve opening direction and a valve closing direction; wherein said three pole members are aligned in a lengthwise direction of said valve rod; wherein said electromagnetic coil is wound about an axis perpendicular to the lengthwise direction; a support holding said valve driving portion and said magnetized member that is movable within said magnetic field in cooperation with said