Two-stage fuel tank isolation valve with integrated in-line pressure relief

A fuel tank isolation valve for an evaporative emissions control system, the fuel tank isolation valve comprising:

• a housing having an outer wall defining a valve chamber therein, and a transfer passage formed in a portion of the outer wall;
• a tank port connected to the housing;
• a canister port connected to the housing:
• the tank port being in selective fluid communication with the canister port via the valve chamber and transfer passage;
• a solenoid assembly connected to the housing, the solenoid assembly including a stationary core, a moveable plunger having a first end and a second end longitudinally opposed to the first end, the first end being adjacent the stationary core, a coil that encircles the stationary core and the moveable plunger, the coil actuating the moveable plunger, and a primary spring disposed between the stationary core and the moveable plunger;
• a first stage poppet fixed to and extending from the second end of the moveable plunger;
• a valve assembly disposed within the valve chamber, the valve assembly including a head, a central body, and a sleeve, the central body being sandwiched between the head and the sleeve, the sleeve including a first stage valve seat wherein the first stage poppet is seated on the first stage valve seat in a closed disposition;
• the valve assembly further including a retainer mated with the sleeve, the retainer including an internal spring seat;
• and
• a first stage spring seated on the internal spring seat;
• the first stage poppet extending through the retainer, and the first stage spring being disposed between the first stage poppet and the internal spring seat of the retainer.