Patent ID: 8549863

Claim:
A supply device for supplying fuel at a regulated flow rate to a gas turbine engine, the device comprising: a supply pipe for supplying fuel to the engine; a pump connected to the supply pipe and delivering the supply pipe with fuel at a pressure that is a function of engine speed; a flow rate measuring device for measuring the fuel flow rate in the supply pipe; a first controlled variable-restriction valve connected in the supply pipe; a first control circuit connected to the flow rate measurement device and to the first valve to control the first valve to deliver a regulated desired fuel flow rate under normal operating conditions of the engine, the first control circuit comprising at least one first electromechanical actuator for controlling a degree to which the first valve is opened; a second controlled variable-restriction valve mounted in the supply pipe in series with the first valve; and a second control circuit connected to the second valve, the second control circuit comprising at least one second electromechanical actuator for controlling the second valve and being configured to reduce the flow rate of fuel in the supply pipe in response to detecting over-speed or over-thrust of the engine, by bringing the second valve into a predetermined partially closed position, and to control thereafter regulation of the fuel flow rate via the second valve over at least a reduced range by modifying the fuel flow rate as a function of a desired engine speed, hereby conserving controllability of the engine, the at least one second electromechanical actuator being controlled from an automatic regulation system of the engine via a second module that is distinct from a first module dedicated to performing regulation by means of the first valve, wherein the second module controls the regulation of the fuel flow rate over the reduced range based on a difference detected between the measured flow rate and a setpoint flow rate so as to position the second valve to regulate the flow rate on a desired setpoint value after the second valve is brought into the predetermined partially closed position in response to detecting over-speed or over-thrust of the engine.