Patent ID: 6807801
Filing Date: 2004-10-26
Classification: F02C,F05D

Abstract:
A gas turbine engine fuel control rapid shut down and ecology system comprising:a first cylindrically shaped valve body, internally bored to define a valve chamber having upper and lower ends; a first cylindrical piston member placed internal to the valve chamber and movable therein along the longitudinal axis thereof; a bored cavity at the upper end and along the longitudinal axis of the first cylindrical piston member; a bored cavity at the lower end and along the longitudinal axis of the first cylindrical piston member, said bored cavity having a diameter larger than the bored cavity on the opposite end of the first cylindrical piston member; a spirally wound spring positioned internal to the bored cavity at the upper end of the first cylindrical piston member, one end bearing on the base of the bored cavity and the other end bearing on the upper internal end of the valve chamber; a fuel passageway leading from an annular cavity along the outer surface of the first cylindrical piston member to a spring loaded accumulator valve; a fuel passageway leading from the spring loaded accumulator valve to a witness drain; a second cylindrically shaped valve body, internally bored to define a second valve chamber having upper and lower ends; a second cylindrical piston member placed internal to the second valve chamber and movable therein along the longitudinal axis thereof; a fluid passageway connecting the upper end of the first valve chamber to a gas turbine engine fuel manifold immediately upstream of combustion chamber atomizers; a fluid passageway connecting a gas turbine engine fuel manifold immediately downstream of a high pressure fuel pump to the lower ends of both first and second valve chambers; a fluid passageway, including an electrically actuated solenoid valve, connecting the lower end of the first valve chamber and upper end of the second valve chamber to a gas turbine engine fuel manifold immediately downstream of a low pressure fuel pump; a fluid passageway connecting the upper end of the second valve chamber to a gas turbine engine fuel manifold upstream of a valve controlling the fuel pressure delivered to combustion chamber atomizers; whereby when said gas turbine engine is turned off, said solenoid valve will simultaneously open causing fuel pressure differentials to drive both first and second cylindrical piston members downward thus rapidly terminating further fuel flow to the combustion chamber atomizers, and providing a temporary cavity to accommodate all fuel leftover in the manifold and distribution system at shutdown as well as all fuel contained in the annular cavity along the outer surface of the first cylindrical piston member.