United Technologies Corporation

Gerald J Gorneault

Charles F Stearns

Gerald P Dyer

Robert H Perkinson

Brian G Donnelly

Fuel is directed to the stages of an afterburner by metering flow to the stages with a single metering valve and by controlling the flow to each stage by means of an integral shutoff and regulating valve. Each shutoff valve opens and closes the fuel flow to a stage as required. Each regulating valve, which is housed within a respective shutoff valve, regulates flow to each segment as a function of the pressure drop across the metering valve so that a constant weight flow to the segment is achieved.

Shutoff and pressure regulating valve

A hybrid fuel metering system has a first circuit (46, 62, 70, 76) to position a valve (18) to direct fuel to a metering valve (20), a second circuit (64, 76) to position the valve (18) to correct engine overspeed and a third circuit (78, 82, 70, 76) to position the valve (18) so that the valve (18) may be manipulated to meter fuel to the engine.

Hybrid fuel metering system

A hybrid fuel metering system incorporating a multi-function control valve (18) is shown. The valve has a sleeve (96), a piston (98) mounted for translational movement within the sleeve and a spool (100) mounted for translational movement in the piston. The piston has three positions for cooperating with the sleeve; a variable first position for metering fuel to an engine (12), a second position for directing fuel to a metering valve (20) and a third position for shutting off flow to the metering valve and to the engine to correct engine overspeed. The spool has two positions a first position to shut off flow to the engine and to the metering valve to shut off the engine and a variable second position to position the piston to meter flow to the engine.

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Palm Harbor, FL, United States of America

Gerald J Gorneault