Abstract: A valve controlled by an electromagnetic metering valve comprising a head ving a control chamber, a supply conduit, and a drain conduit. The head also presents a cavity communicating with the supply conduit and in which a portion of the moving element for closing the injection orifice slides in such a manner as to choke the supply conduit during injection. The supply conduit communicates with a receiving chamber located between a seat in the body of the valve and the outer surface of an appendix on the head; and the moving element is pushed into the closed position by the combined action of the pressure at each end, and a spring located close to the injection chamber.

Abstract: The body of a control valve is housed inside the hollow body of an injector y means of a fluidtight connection comprising a pair of precision ground mating surfaces, and a sealing ring compressed between a further two surfaces of the bodies adjacent to the aforementioned pair of surfaces. The ring may be made of rubber, may be fitted between two cylindrical surfaces, and is also pressed by the fuel on to a shoulder of the valve body. Alternatively, the ring may consist of a soft iron washer pressed axially between a flange on the valve body and a surface of the hollow body.

Abstract: The control valve of an injector comprises a plunger and a valve body having an axial control chamber connected to a drain conduit via a hole. The hole terminates at a flat surface of the valve body, which surface is perpendicular to the operating direction of the actuator of the plunger. The plunger consists of a pad element having a flat face engaging the surface of the valve body, while the opposite face may be flat or spherical, and is engaged by a complementary surface on the end of the actuator.

Abstract: An electromagnet housed in a skirt pressed on to a cap integral with the in conduit of the control valve. The skirt presents two shoulders separated by a distance greater than the height of the core of the electromagnet and on which the core and the cap rest. At least one Belleville washer between the core and the cap holds the core elastically on the respective shoulder and detached from the cap. A retaining ring coaxial with the washer is also provided for sealing the fuel flowing in an axial hole on the core and in the drain conduit.

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.

Abstract: An injector comprising a plunger for controlling fuel passage between an injection chamber and at least an injection orifice formed in an injection nozzle; and an electromagnetic fuel metering valve for controlling fuel passage through a drain orifice between a control chamber, supplied with fuel under pressure, and a low-pressure chamber, so as to reduce the fuel pressure in the control chamber to a given value and so displace the plunger; characterised by the fact that pressurized fuel is supplied to the injection chamber and control chamber by means of a single fitting connected to a supply pipe and coming out inside a supply orifice formed in the injector body and communicating with the control chamber and a duct for supplying fuel to the injection chamber.

Abstract: The pump comprises a plurality of cylinders (4) disposed radially in a star formation around a shaft (5) with an eccentric (6) in a body (2, 3) formed by first and second members (2, 3) joined together by bolts (13). Each cylinder (4) is clamped in position between the first and second elements (2, 3) of the body between a pair of the said bolts (13). The facing surfaces of each cylinder (4) and of at least one (3) of the members (2, 3) of the pump body are spaced in correspondence with the central portion of the cylinder (4) in which is formed the chamber (9) in which the associated piston (10) is movable, so that the contact between the cylinder (4) and the at least one member (3) of the body (2, 3) of the pump is limited to surfaces outside the central portion of the cylinder (4).