Isolation valve with fast depressurization for high-pressure fuel tank
First Claim
1. An isolation valve, comprising:
- a flow restrictor disposed in a passage, the flow restrictor havinga piston having a first orifice,a depressurization valve having a second orifice,a depressurization spring having a biasing force that biases the depressurization valve to an open position;
a flow restrictor spring that applies a biasing force on the flow restrictor to bias the flow restrictor to an open position; and
a solenoid valve assembly, havinga coil that is selectively energized by a signal from a controller, andan armature that is moveable between (1) an extended position that overcomes the biasing force of the flow restrictor spring to move the flow restrictor to a closed position and to close at least one of the first orifice and the second orifice and (2) a retracted position to open at least one of the first orifice and the second orifice,wherein when the coil is energized, the armature moves to the retracted position to allow vapor to flow through the first orifice until a vapor pressure through the isolation valve drops below a first vapor pressure threshold,and wherein, when the depressurization spring overcomes the vapor pressure below the first vapor threshold, the depressurization valve opens to allow vapor to flow through at least one of the first orifice and the second orifice.
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Accused Products
Abstract
An isolation valve includes a flow restrictor disposed in a passage and having a piston with a first orifice and a depressurization valve with a second orifice. The valve also includes a solenoid valve assembly having a coil that is selectively energized by a signal from a controller and an armature that is moveable between first and second positions to open and close the first orifice and/or the second orifice. When the coil is energized, the armature moves to the second position to allow vapor to flow through the first orifice, the depressurization valve selectively opens to allow vapor to flow through the first orifice, the second orifice, or both. The two orifices work together to provide controlled vapor flow.
27 Citations
15 Claims
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1. An isolation valve, comprising:
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a flow restrictor disposed in a passage, the flow restrictor having a piston having a first orifice, a depressurization valve having a second orifice, a depressurization spring having a biasing force that biases the depressurization valve to an open position; a flow restrictor spring that applies a biasing force on the flow restrictor to bias the flow restrictor to an open position; and a solenoid valve assembly, having a coil that is selectively energized by a signal from a controller, and an armature that is moveable between (1) an extended position that overcomes the biasing force of the flow restrictor spring to move the flow restrictor to a closed position and to close at least one of the first orifice and the second orifice and (2) a retracted position to open at least one of the first orifice and the second orifice, wherein when the coil is energized, the armature moves to the retracted position to allow vapor to flow through the first orifice until a vapor pressure through the isolation valve drops below a first vapor pressure threshold, and wherein, when the depressurization spring overcomes the vapor pressure below the first vapor threshold, the depressurization valve opens to allow vapor to flow through at least one of the first orifice and the second orifice. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An isolation valve, comprising:
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a flow restrictor disposed in a passage, the flow restrictor having a piston having a first orifice, a depressurization valve having a second orifice; and a solenoid valve assembly, having a coil that is selectively energized by a signal from a controller, and an armature that is moveable between a first position to close at least one of the first orifice and the second orifice and a second position to open at least one of the first orifice and the second orifice, wherein when the coil is energized, the armature moves to the second position to allow vapor to flow through the first orifice, and wherein the depressurization valve selectively opens to allow vapor to flow through at least one of the first orifice and the second orifice, the depressurization valve is disposed in the first orifice, and the second orifice is smaller than the first orifice. - View Dependent Claims (13)
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14. An isolation valve, comprising:
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a flow restrictor disposed in a passage, the flow restrictor having a piston having a first orifice, a depressurization valve having a second orifice, a depressurization spring having a biasing force that biases the depressurization valve to an open position; a flow restrictor spring that applies a biasing force on the flow restrictor to bias the flow restrictor to an open position; and a solenoid valve assembly, having a coil that is selectively energized by a signal from a controller, and an armature that is moveable between (1) an extended position that overcomes the biasing force of the flow restrictor spring to move the flow restrictor to a closed position and to close at least one of the first orifice and the second orifice and (2) a retracted position to open at least one of the first orifice and the second orifice, wherein when the coil is energized, the armature moves to the retracted position to allow vapor to flow through the first orifice until a vapor pressure through the isolation valve drops below a first vapor pressure threshold, wherein, when the depressurization spring overcomes the vapor pressure below the first vapor threshold, the depressurization valve opens to allow vapor to flow through at least one of the first orifice and the second orifice, wherein the depressurization valve is a poppet valve, wherein the depressurization valve is disposed in the first orifice, and wherein the second orifice is smaller than the first orifice. - View Dependent Claims (15)
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Specification