Isolation valve with fast depressurization for high-pressure fuel tank

An isolation valve, comprising:

• a flow restrictor disposed in a passage, the flow restrictor having an orifice and configured to provide a first flow path, a second flow path, and a third flow path;
• a flow restrictor spring that applies a biasing force to the flow restrictor to bias the flow restrictor to an open position that opens the second flow path;
• and
• a solenoid assembly, including:
• a coil;
• and
• an armature that is moveable between (i) an extended position that overcomes the biasing force of the flow restrictor spring to move the flow restrictor to a closed position that closes the first flow path, the second flow path, and the third flow path, and (ii) a retracted position that opens the first flow path,
• wherein when the coil is energized, the armature moves to the retracted position to allow vapor to flow through the first flow path at least until the biasing force of the flow restrictor spring overcomes a vapor pressure in a first reservoir to open the second flow path;
• wherein the first flow path includes a first path from the first reservoir through the orifice to a second reservoir;
• the second flow path includes a first flow direction from the first reservoir to the second reservoir via a second path, the second path including space between the flow restrictor and the passage;
• and the third flow path includes a second flow direction from the second reservoir to the first reservoir via the second path.

An isolation valve, comprising:

• a flow restrictor disposed in a passage having a funnel-shaped portion, the flow restrictor including:
• an orifice;
• and
• a piston configured to move in the funnel-shaped portion;
• a flow restrictor spring configured to apply a biasing force on the flow restrictor to bias the piston to an open position;
• and
• a solenoid assembly, including:
• a coil;
• and
• an armature that is moveable between (i) an extended position that overcomes the biasing force of the restrictor spring to move the flow restrictor to a closed position and to close the orifice, and (ii) a retracted position to open the orifice,
• wherein when the coil is energized, the armature moves to the retracted position to allow vapor to flow through the orifice at least until the biasing force of the flow restrictor spring overcomes a vapor pressure;
• and, the open position of the flow restrictor allows vapor to flow through a space between the flow restrictor and the funnel-shaped portion of the passage.

An isolation valve, comprising:

• a flow restrictor disposed in a passage having a stepped portion, the flow restrictor having:
• an orifice;
• and
• a piston configured to move in the stepped portion;
• a flow restrictor spring that applies a biasing force on the flow restrictor to bias the piston to an open position;
• and
• a solenoid assembly, including:
• a coil;
• and
• an armature that is moveable between (i) an extended position that overcomes the biasing force of the restrictor spring to move the flow restrictor to a closed position and to close the orifice, and (ii) a retracted position to open the orifice,
• wherein when the coil is energized, the armature moves to the retracted position to allow vapor to flow through the orifice at least until the biasing force of the flow restrictor spring overcomes a vapor pressure;
• and, the open position of the flow restrictor allows vapor to flow through a space between the flow restrictor and the stepped portion of the passage.