Patent ID: 8827236

Claim:
A solenoid-operated normally open control valve for positioning within a receptacle that is adjacent to a fluid flow path between an inlet passageway and an outlet passageway in high pressure and high flow applications, wherein the outlet passageway defines a main orifice immediately adjacent to the receptacle, the solenoid valve comprising: a sleeve defining a longitudinal axis; an armature assembly disposed within the sleeve, said armature assembly including a primary piston and a secondary piston, wherein each of the primary piston and the secondary piston are independently movable along the longitudinal axis, said secondary piston defining a pilot orifice connected with a center passage extending therethrough, the center passage communicating with the main orifice, said primary piston having a seal pin configured to extend into the pilot orifice of the secondary piston, whereby said seal pin may block and unblock the center passage with movement of the primary piston in relation to the secondary piston for permitting fluid flow when the valve is in an open condition and preventing fluid flow when the valve is in a closed condition; a solenoid coil being disposed about the sleeve for effecting movement of the primary piston from a normally open position to a closed position; and a spiral cut scarf ring being disposed about the secondary piston and in contact with both the secondary piston and the sleeve, said spiral cut scarf ring being configured to allow controlled leakage from the inlet passageway to a cavity between the primary piston and the secondary piston for holding the seal pin away from the pilot orifice in a normally open position.