Abstract: A valve assembly is provided for venting pressure in a fuel tank. The valve assembly includes a housing that defines a passage and a valve seat provided at one end of the passage. A float assembly is disposed within the housing. The float assembly includes a flexible membrane seal that seals against the valve seat when the float assembly rises in response to a rising fuel level in the fuel tank, and a reopen profile that applies a reopening force along a select portion of the membrane seal to release the membrane seal from the valve seat when the float assembly drops in response to a falling fuel level in the fuel tank.

Abstract: A vapor isolation valve includes a first chamber in fluid communication with a fuel tank and a second chamber disposed with respect to the first chamber. A diaphragm is disposed between the first and second chambers, has an orifice allowing fluid communication therebetween, and is moveable between a diaphragm open position and a diaphragm closed position. A third chamber is disposed adjacent the first chamber, relative to the diaphragm, and is in fluid communication with an exit passage. The diaphragm open position allows fluid communication between the first and third chambers, and the diaphragm closed position substantially restricts fluid communication therebetween. A pilot valve is disposed between the second and third chambers and is selectively moveable between a pilot open position configured to allow fluid communication between the second and third chambers and a pilot closed position configured to block fluid communication therebetween.

Abstract: A fuel system includes a fuel tank, a fill head, a vapor canister, and a valve assembly. The fill head is in fluid communication with the fuel tank. Fluid flows from the fill head to the fuel tank. The vapor canister is configured for absorbing vapor therein. A recirculation line is configured to fluidly extend between the fuel tank and the fill head. A vapor line is configured to fluidly extend between the fuel tank and the vapor canister. The valve assembly is operatively disposed along the vapor line or the recirculation line. The valve assembly includes a filter having a membrane formed from a micro-porous element that is fluid impermeable and vapor permeable. Fluid is prevented from flowing through the membrane and into the vapor canister while allowing vapor to flow through the membrane and into the vapor canister.

Abstract: A fill head assembly for a fuel storage system includes a check valve disposed within a central region of the fill head assembly. The check valve includes a membrane covering a vent outlet of the fill head assembly. The check valve prevents liquid flow from the central region into the vent outlet, while simultaneously allowing vapor flow from the central region into the vent outlet. The membrane includes a micro-porous material that is liquid impermeable, thereby preventing liquid flow through the membrane, and is vapor permeable, thereby allowing vapor flow through the membrane.

Abstract: An overfill prevention device is provided for preventing overflow of a fluid storage tank. The overfill prevention device includes a filler cup designed to fit within the fill opening of the tank body and attach thereto. A seal that is adapted for receiving and sealing to a fill nozzle is placed between upper and lower regions of the filler cup. A breather piece, which defines a vapor path with first and second openings, is integrated with the filler cup. The first opening of the breather piece is fluidly coupled to the lower cup region, whereas the second opening is positioned above the first opening, located at or below the full level of the storage tank.

Abstract: A tank assembly (70) for storing a liquid reductant (74) includes a tank (78) defining a chamber (82), a filler tube (94) having an opening (102) and at least partially defining a fill passageway (98) from the opening (102) to the chamber (82), and a vent system (130). The vent system (130) includes a recirculation line (150) that provides fluid communication between the chamber (82) and the fill passageway (98). A float valve (174) in the recirculation line (150) prevents the conveyance of liquid (74) through the recirculation line (150).

Abstract: An isolation valve has a housing having a vent path and a sealing member that opens and closes the vent path. The sealing member is driven by a motor via a gear arrangement that links the sealing member with the motor. The motor drives the gear arrangement in a first direction to open the vent path and a second direction to close the vent path. During operation, a motor current rises when the sealing member reaches the first position and/or the second position. The controller detects the motor current rise and changes operation of the motor (e.g., stops the motor) in response.

Abstract: An overfill prevention device is provided for preventing overflow of a fluid storage tank. The overfill prevention device includes a filler cup designed to fit within the fill opening of the tank body and attach thereto. A seal that is adapted for receiving and sealing to a fill nozzle is placed between upper and lower regions of the filler cup. A breather piece, which defines a vapor path with first and second openings, is integrated with the filler cup. The first opening of the breather piece is fluidly coupled to the lower cup region, whereas the second opening is positioned above the first opening, located at or below the full level of the storage tank.

Abstract: An overfill prevention device is provided for preventing overflow of a fluid storage tank. The overfill prevention device includes a filler cup designed to fit within the fill opening of the tank body and attach thereto. A seal that is adapted for receiving and sealing to a fill nozzle is placed between upper and lower regions of the filler cup. A breather piece, which defines a vapor path with first and second openings, is integrated with the filler cup. The first opening of the breather piece is fluidly coupled to the lower cup region, whereas the second opening is positioned above the first opening, located at or below the full level of the storage tank.

Abstract: A fill head assembly for a fuel storage system includes a check valve disposed within a central region of the fill head assembly. The check valve includes a membrane covering a vent outlet of the fill head assembly. The check valve prevents liquid flow from the central region into the vent outlet, while simultaneously allowing vapor flow from the central region into the vent outlet. The membrane includes a micro-porous material that is liquid impermeable, thereby preventing liquid flow through the membrane, and is vapor permeable, thereby allowing vapor flow through the membrane.

Abstract: A fuel system includes a fuel tank, a fill head, a vapor canister, and a valve assembly. The fill head is in fluid communication with the fuel tank. Fluid flows from the fill head to the fuel tank. The vapor canister is configured for absorbing vapor therein. A recirculation line is configured to fluidly extend between the fuel tank and the fill head. A vapor line is configured to fluidly extend between the fuel tank and the vapor canister. The valve assembly is operatively disposed along the vapor line or the recirculation line. The valve assembly includes a filter having a membrane formed from a micro-porous element that is fluid impermeable and vapor permeable. Fluid is prevented from flowing through the membrane and into the vapor canister while allowing vapor to flow through the membrane and into the vapor canister.

Abstract: A tank assembly (70) for storing a liquid reductant (74) includes a tank (78) defining a chamber (82), a filler tube (94) having an opening (102) and at least partially defining a fill passageway (98) from the opening (102) to the chamber (82), and a vent system (130). The vent system (130) includes a recirculation line (150) that provides fluid communication between the chamber (82) and the fill passageway (98). A float valve (174) in the recirculation line (150) prevents the conveyance of liquid (74) through the recirculation line (150).

Abstract: An overfill prevention device is provided for preventing overflow of a fluid storage tank. The overfill prevention device includes a filler cup designed to fit within the fill opening of the tank body and attach thereto. A seal that is adapted for receiving and sealing to a fill nozzle is placed between upper and lower regions of the filler cup. A breather piece, which defines a vapor path with first and second openings, is integrated with the filler cup. The first opening of the breather piece is fluidly coupled to the lower cup region, whereas the second opening is positioned above the first opening, located at or below the full level of the storage tank.

Abstract: A vapor isolation valve includes a first chamber in fluid communication with a fuel tank and a second chamber disposed with respect to the first chamber. A diaphragm is disposed between the first and second chambers, has an orifice allowing fluid communication therebetween, and is moveable between a diaphragm open position and a diaphragm closed position. A third chamber is disposed adjacent the first chamber, relative to the diaphragm, and is in fluid communication with an exit passage. The diaphragm open position allows fluid communication between the first and third chambers, and the diaphragm closed position substantially restricts fluid communication therebetween. A pilot valve is disposed between the second and third chambers and is selectively moveable between a pilot open position configured to allow fluid communication between the second and third chambers and a pilot closed position configured to block fluid communication therebetween.