Pump gas mixture - particularly air - with section variable injection, comprising: - an enclosure (1) gas mixture, - flowing into the enclosure (1) mixing a first conduit (2) feed enclosure (1) demezcla, a gas, called HP gas, led to a first pressure - leading to the enclosure (1) mixing a second conduit (3) supply the enclosure (1) demezcla of a gas, called IP gas, led to a second pressure different from said first pressure, - connected to the enclosure (1) mixing a conduit (4) output mixed gas, termed flue gas, the enclosure (1) mixing , said offgas an intermediate pressure between said primerapresión and said second pressure, which depends on the proportions of gas HP and IP delivered alrecinto (1) mixing, - an actuator (10) disposed tire in said first conduit ( 2) power HP gas, comprising the actuator (10) tire: u n piston (11) integral mobile with a shutter (12) whose position in said first conduit (2) supply Ignition determines a passage section HP gas into the enclosure (1) mixing of Queuña way change in position of said piston (11) involves a variation of the passage section, * a mobile camera (13) for controlling said piston (11) pressure fed by a duct (14) depressurisation so that the pressure prevailing in the chamber (13 ) control determines the positionof said piston (11 movable), - a pneumatic circuit called circuit (20) power, arranged between a pressure source, called first source (21) pressure, and said conduit (14) pressurizing being adapted elcircuito (20) of power to deliver a pressure called control pressure to the chamber (13) decontrol said conduit (14) pressurizing, characterized in that: - the circuit (20) power comprises at least a valve (22) leakage disposed between the primerafuente (21) and pressure duct (14) pressurization, adapted to generate a leak in the circuit (20) power at a flow rate adjustable leak whose value determines the pressure delivered to the chamber (13) decontrol actuator (10) tire and comprising: - an electric motor (7) adapted to allow displacement of said valve (22) leakage between unaposición called fully open position, corresponding to the maximum opening defuga valve, and a position, called fully closed position in which the pressure delivered to the decontrol chamber is the pressure of said first pressure source, - a sensor (45) of pressure provided at the outlet of the pump and adapted to deliver a signal, called pressure measurement signal representative of the pressure of said gas outlet, - an electric drive (8) control adapted to receive a command signal representative of a value target pressure to be supplied the pump at the pump outlet and the measurement signal depression delivered by the sensor (45) of pressure, said unit (8) Electric parasuministrar control to the motor (7) electrical being adapted a order adapted to drive an opening / closing said (such) valve (s) (22) of leakage, so that the value of the pressure delivered to the chamber (13) decontrol so amend that said shutter (12 ) can be displaced in said first conduit (2), and Labomba provide, at the output of the pump, a gas outlet to said reference pressure.
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