High pressure direct pilot actuated valve

A pilot actuated valve assembly, comprising:

• a valve body having an inlet at inlet pressure, an outlet at outlet pressure, a main orifice having a main valve seat, a main valve bore, a pilot seat bore formed in the valve body and overlying the main valve bore, the valve body defining a flow passage extending between the inlet and the outlet;
• a main valve disposed in the valve body and shiftable between a closed position where the main valve is seated against the main valve seat and an open position where the main valve is spaced away from the main valve seat;
• a pilot valve including a pilot seat, the pilot seat disposed in the pilot seat bore of the valve body, and a pilot cavity at a pilot cavity pressure;
• a tube having an inner bore and positioned over the pilot valve seat;
• a sleeve mounted to the valve body and including a sleeve bore sized to receive a portion of the tube, the sleeve positioned to retain the pilot seat within the pilot seat bore and to retain a lower portion of the tube adjacent the pilot seat;
• a valve bonnet mounted over the sleeve and securing the sleeve within the valve body;
• the pilot valve disposed within the tube, the pilot valve shiftable between a closed position where the pilot valve is seated against the pilot seat and an open position where the pilot valve is spaced away from the pilot seat;
• a solenoid actuator operatively coupled to the shaft and arranged to shift the pilot valve piston between the closed position and the open position;
• a first passage extending through a bleed port in the main valve to the pilot cavity, and a second passage extending between the pilot cavity and the outlet, the second passage closed when the pilot valve is closed and open when the pilot valve is open to vent the pilot cavity pressure to the outlet;
• thereby allowing the main valve to shift between the closed and open positions due to a pressure imbalance caused by shifting of the pilot valve between the closed and open positions due to a decrease in pressure in the pilot cavity;
• and
• wherein an upper portion of the main body includes a recess, a lower portion of the sleeve is disposed in the recess, and wherein the sleeve is retained in the recess by the valve bonnet threadedly attached to the valve body, a portion of the valve bonnet overlying and engaging a portion of the sleeve.