Abstract: Fuel injection system of the common rail type provided with a high-pressure pump, which supplies fuel to a common channel that in turn supplies a series of injectors, and with a control unit, which is capable of keeping the pressure of the fuel within the common channel, moment by moment, equal to a desired value that generally varies over time; the control unit is coupled to a device for regulating the flow rate of the high-pressure pump in order to control the flow rate of the high-pressure pump so as to supply the common channel, moment by moment, with the amount of fuel required in order to have the desired value for pressure inside said common channel.

Abstract: Fuel injection system of the common rail type provided with a high-pressure pump, which supplies fuel to a common channel that in turn supplies a series of injectors, and with a control unit, which is capable of keeping the pressure of the fuel within the common channel, moment by moment, equal to a desired value that generally varies over time; the control unit is coupled to a device for regulating the flow rate of the high-pressure pump in order to control the flow rate of the high-pressure pump so as to supply the common channel, moment by moment, with the amount of fuel required in order to have the desired value for pressure inside said common channel.

Abstract: A variable-flow high-pressure pump comprising at least one piston mounted to slide axially and in a leak-tight manner within a cylindrical cavity obtained in the body of the pump so as to define a variable-volume pumping chamber adapted to be filled with a fluid, and an intake valve and a delivery valve adapted to enable the one-way flow of the fluid respectively into and out of the pumping chamber, the intake valve being formed by a non-return valve comprising a shutter body which can move to and from a closed position in which it prevents the passage of the fluid via the valve, and an elastic member adapted to maintain the shutter body in the above-mentioned closed position, the high-pressure pump further comprising a hydraulic piston selectively adapted to distance the shutter body from the closed position by overcoming the resistance of the elastic member so as to enable the fluid also to flow freely via the valve in a direction opposite to the normal direction.

Abstract: A control valve for an injector comprising a valve body having of a control chamber connected to a drain conduit via a hole terminating at a flat surface of the valve body. The plunger of the valve consists of a plate housed in a seat, the bottom wall of which arrests the travel of the plate after a travel "b". This is controlled by the armature of an electromagnet, which armature presents a rod arrested directly by an adjustable stop after traveling a distance "a" greater than travel "b". The opening and closing time of the valve is therefore unaffected by wear on the stop of the armature. The rod of the armature is in one piece with a stem activating the plate, and with a threaded portion screwed to the armature.