Two stage solenoid control valve

A solenoid control valve for use in supplying pressure control to a gas turbine bleed valve, comprising:

• a housing having a supply inlet, a major channel, a minor channel, and a vent;
• a ball pilot valve disposed within said housing and movable between at least (i) a closed position, in which the supply inlet is in fluid communication with the minor channel, and the major channel is in fluid communication with the vent, and (ii) an open position, in which the supply inlet is in fluid communication with the major channel and the minor channel, and the major channel is not in fluid communication with the vent;
• an activation arm moveably disposed within said housing, said activation arm configured to move said pilot ball valve between the open and closed positions;
• a dual coil solenoid disposed within said housing, said solenoid adapted to receive a current and configured, upon receipt thereof, to move said activation arm to a position that moves said ball pilot valve to its open position;
• biasing means positioned within said dual coil solenoid and configured to bias said ball pilot valve toward its closed position;
• an actuator chamber in fluid communication with said housing via said minor channel and said major channel, said actuator chamber having a vent contact and a fill contact disposed therein, and further including a control port, and an outlet port;
• and
• an actuator positioned within said actuator chamber, said actuator having a major surface coupled to a poppet, said poppet defining a minor surface having a fill seat and a vent seat disposed thereon, the actuator movable between at least (i) a first position, in which the poppet vent seat contacts the vent contact, and the minor channel, the actuator chamber, and the control port are in fluid communication with each other, and (ii) a second position, in which the poppet fill seat contacts the fill contact, the control port and the outlet port are in fluid communication with each other, and the major channel, the minor channel, and the actuator chamber are each isolated from both the control port and the outlet port.