Patent ID: 6725876
Filing Date: 2004-04-27
Classification: F02C,F02M,Y02T,Y10S,Y10T

Abstract:
A fuel control valve comprising:a valve body having a fuel inlet, a fuel outlet in fluid communication with the fuel inlet, and a valve metering plug opening; an actuator piston movably attached to an actuator cylinder having an actuation area; a hydraulic manifold forming a valve bonnet and an actuator seat, the hydraulic manifold having a hydraulic path in communication with the actuator piston, a hydraulic seal leakage path and a gas seal leakage path, the actuator cylinder connected to the hydraulic manifold at the actuator seat, the hydraulic manifold having a metering plug guide mounted within the valve metering plug opening, the metering plug guide forming a thermal isolation barrier between the valve body and the hydraulic manifold; a valve metering plug movably mounted within the metering plug guide and directly coupled to the actuator piston, the valve metering plug sealing the fuel outlet from the fuel inlet when at a closed position and providing a variable sized opening to allow fuel to flow at various flow rates when the actuator piston is moved in response to a commanded position; and wherein the hydraulic seal leakage path is located in the hydraulic manifold between the actuator seat and the thermal isolation barrier and the gas seal leakage path is located between the hydraulic seal leakage path and the valve body.