A fuel injector includes control valve for controlling fuel pressure in a control chamber. The control valve includes a valve seat; and a valve member having a valve face for cooperating with the valve seat to control fuel pressure in the control chamber. A return line is provided for returning fuel from the control chamber. An armature connected to the valve member and an actuator is provided for actuating the armature. The armature is disposed in an armature chamber. A deflector is provided in the armature chamber to form a first sub-chamber and a second sub-chamber. The first and second sub-chambers are in fluid communication with each other via a first aperture. A pressure differential is established between the first and second sub-chambers when the valve face lifts from the valve seat promoting the flow of fuel from the second sub-chamber into the first sub-chamber through the first aperture.

Various embodiments include a check valve for a high-pressure component in a fuel injection system comprising: a valve housing with a valve hole having an inner diameter; a valve seat and a sealing element arranged in the valve hole; and a coil spring pushing the sealing element toward the valve seat along a longitudinal axis of the valve hole. The coil spring includes a plurality of coil turns each having an outer diameter. In a non-assembled state of the check valve, the outer diameter of at least one of the coil turns is greater than the inner diameter of at least a portion of the valve hole, so that in an assembled state of the check valve, the coil spring is secured in a force-fitting manner in the valve hole.

The invention relates to a valve, in particular a suction valve, in a high-pressure pump of a fuel injection system, in particular a common rail injection system, comprising a magnet actuator (22) which has a magnet coil (6), a magnet armature (10) that moves in a stroke-like manner, and a pole core (20), wherein the magnet armature (10) and the pole core (20) together limit a working air gap (28), and the magnet armature (10) can at least indirectly contact the pole core (20), wherein the valve also has a valve element (14) which can be moved between an open position and a closed position, and which is at least indirectly in mechanical contact with the magnet armature (10). According to the present invention, a separate magnet armature insert (8) arranged in the magnet armature (10) and/or a separate pole core insert (24) arranged in the pole core (20) is provided in the contact area of the magnet armature (10) on the pole core (20), in order to achieve a separation of the mechanical and magnetic forces. The invention also relates to a high-pressure pump with a suction valve of this type.

A fluid passage device including a passage for flowing high-pressure fluid of a predetermined or higher pressure comprises a sac bore cylinder of a metal, which includes therein a closed passage and a branch passage. The closed passage is shaped to extend straightly in a predetermined direction and has a closed top end, and the branch passage is branched off from the closed passage. A top end part of the closed passage at a closed side is defined by a ceiling wall surface, which is perpendicular to the predetermined direction, a passage wall surface, which is parallel to the predetermined direction, and a connecting wall surface, which connects the ceiling wall surface and the passage wall surface.

The connecting wall surface is shaped to curve in a direction to expand the closed passage.

A fuel injector includes control valve for controlling fuel pressure in a control chamber. The control valve includes a valve seat; and a valve member having a valve face for cooperating with the valve seat to control fuel pressure in the control chamber. A return line is provided for returning fuel from the control chamber. An armature connected to the valve member and an actuator is provided for actuating the armature. The armature is disposed in an armature chamber. A deflector is provided in the armature chamber to form a first sub-chamber and a second sub-chamber. The first and second sub-chambers are in fluid communication with each other via a first aperture. A pressure differential is established between the first and second sub-chambers when the valve face lifts from the valve seat promoting the flow of fuel from the second sub-chamber into the first sub-chamber through the first aperture.

An electromagnetic actuator includes an electromagnet having a coil, which coil surrounds a pole core, and a magnet armature, which can be moved toward the pole core by the electromagnet, wherein the magnet armature has a bearing surface facing the pole core and the pole core has a correspondingly opposite counter surface. The bearing surface and/or the counter bearing surface has a layer that prevents direct contact of the bearing surface with the counter bearing surface and that causes damping of the approaching movement.

A device and a method are provided for controlling a magnetic valve which has a coil and an armature which is displaceable by magnetic force, by means of which armature a closure element is displaceable for the purposes of injecting fuel into a combustion chamber, the method includes the steps of: energizing the coil with a voltage in accordance with a first voltage profile in order to generate a first electrical current through the coil; determining a first profile as a function of a first magnetic flux and the first current; identifying, in the first profile, a first characteristic of at least one first start of displacement at which the armature begins to displace the closure element, generating a second voltage profile and energizing the coil in accordance with the second voltage profile, such that, in a second profile, as a function of a second magnetic flux and a second current, a second characteristic of a second start of displacement is more similar to a reference characteristic than the first characteristic.

Electromagnetic valve, particularly for controlling a fuel injector or for regulating the pressure of a high-pressure fuel accumulator, comprising a casing (2), an electromagnet (24, 25) formed of a yoke (24) and an electromagnetic coil (25) housed in the latter, and an armature (22) in one or more parts. An abutment disk (28) is provided between the transverse face of the armature (22) turned towards the yoke (24) and the transverse face facing the yoke (24), this abutment disk (28) being made of a magnetized or magnetizable material, particularly of a ferromagnetic material.

A control device, which is a fuel supply control device, performs a self-heating procedure by which an electric current is applied to a solenoid of a CNG injection valve in such a range that CNG is not injected from the CNG injection valve before engine operation using CNG is started.