Abstract: The purging of residual fuel in gas turbine combustor fuel injectors is disclosed in which the fuel injector includes a fuel element having a first and second fuel passage for discharging the fuel to the combustor of the gas turbine. Upon interruption of the fuel to the fuel element, high pressure air is passed through an air passage to the first fuel passage to force the fuel in the reverse direction through the first fuel passage, through the second fuel passage, and discharge the residual fuel in each of the passages to the combustor through the second fuel passage.

Abstract: A pressure-actuated valve of the type used in the fuel systems of gas turbine engines and the like combines the functions of check valve and metering valve in a housing forming a single assembly. A movable valve actuator is slidably movable along a central axis within the housing, The actuator has two spaced-apart valve faces that cooperate with two spaced apart valve seats mounted to the housing. One of the valve-seat/valve-face combinations controls flow through a primary outlet port from the housing, and the second combination controls fluid flow through a separate, secondary outlet. The second valve combination includes telescopically mating inner and outer wall surfaces having a metering passage in the outer wall characterized by a transverse cross-section that varies from a minimum to a maximum at its opposite ends. As the inner and outlet wall surfaces move relative to each other, the exposed cross-section of the metering passage increases to permit increased flow through the valve.

Abstract: The purging of residual fuel. In gas turbine combustor fuel injectors is disclosed in which the fuel injector includes a fuel element having a first and second fuel passage for discharging the fuel to the combustor of the gas turbine. Upon interruption of the fuel to the fuel element, high pressure air is passed through an air passage to the first fuel passage to force the fuel in the reverse direction through the first fuel passage, through the second fuel passage, and discharge the residual fuel in each of the passages to the combustor through the second fuel passage.