An electromagnetic fuel injection valve includes: a valve body having a rod connected to a valve part; a movable core fitted onto the rod slidably between valve-open side and valve-closed side stoppers; a fixed core having an attracting face opposing the movable core; a valve spring urging the valve body in a valve-closing direction; and an auxiliary spring exhibiting a spring force that urges the movable core to separate from the valve-open side stopper and abut against the valve-closed side stopper when a coil is unenergized. A first curved face part is protruded from a surface, opposing the movable core, of the fixed core, and a second curved face part is provided in an outer peripheral part of a surface, opposing the movable core, of the valve-open side stopper, the first and second curved face parts each having an arcuate cross-section and being capable of abutting against the movable core.

A fuel system for an internal combustion engine includes a pressurized fuel supply, and a fuel injector fluidly connected to the pressurized fuel supply. The fuel injector includes a valve seat plate forming a valve seat, an injection control valve, and a nozzle cavity. A filter, which can include a 2-dimensional filter, is positioned partially within the valve seat plate and partially within an injector body to filter an incoming flow of high-pressure fuel. The valve seat plate and filter are integrated in a valve seat plate and filter assembly.

A valve body has a seat surface swollen toward a seating surface of an injection hole body having an injection hole. A fuel passage is between the injection hole body and the valve body and is opened and closed due to separation and seating of the seat surface. In a seat portion throttle state, a flow rate of injected fuel is throttled by a gap between the seat surface and the seating surface. In an injection hole throttle state, the flow rate of fuel is throttled by the injection hole. When the valve body is operated from a valve closing position to a full lift position, the seat portion throttle state is brought from the valve closing position to a predetermined intermediate position, and the injection hole throttle state is brought from the intermediate position to the full lift position.

A fuel injector includes an injector housing, an outlet check, an injection control valve assembly, and a valve seat orifice plate integrating a valve seat and various orifices for outlet check control. In the valve seat orifice plate a drain orifice extends between a valve seat surface and a check control chamber formed between a closing hydraulic surface of the outlet check and the valve seat orifice plate. First and second re-pressurization orifices extend between an outer surface of the valve seat orifice plate and the check control chamber.

A valve assembly includes a valve member and a valve body. The valve body has a contact surface intended to come into contact with an adjacent contact member The valve body also has a channel having an end portion opening to the outside of the valve body at at least one end opening, a valve member seat encircling a passage cross-section of the end portion of the channel, and an intermediate surface extending between the contact surface and the end opening. The valve member is capable of engaging with the valve member seat by contact in order to prevent a flow in the channel. The valve body has a groove provided on the intermediate surface, the groove encircling the valve member seat.

An injector nozzle having a first part having a stem and a flange, the flange having a flange surface, a body including a wall defining a hole, an annular nozzle ring having a first surface and a second surface wherein the first surface and/or the flange surface include a plurality of grooves, the stem being received in the hole, the first part being secured to the body to secure the nozzle ring in place such that the first surface engages the flange surface, the second surface engages the body, and the plurality of grooves define a plurality of injector holes.

A valve is provided, in particular an injection valve, having a valve seat and a valve needle which extends along a closing direction for the most part, the valve seat having a valve-seat surface, and a valve-closing element is mounted on an end of the valve needle facing the valve seat, the valve-closing element being able to be moved between an open position and a closed position, and the valve-closing element together with the valve-seat surface forming a sealing seat in the closed position, the valve-closing element having a greater core hardness and/or surface hardness than the valve-seat surface.

A fuel injector including a fuel injector housing (2), a valve seat (4) formed at one end of the fuel injector housing (2), and a valve body (10) disposed in the fuel injector housing (2) and operable to open and close a spray hole in the valve seat (4). The valve seat (4) includes a base portion (16) and insert portion (26) having spray holes (8) that is secured to the base portion (16).

A valve, in particular, a fuel injector, has an improved sealing at its spray-side end. The fuel injector includes an excitable actuator for actuating a valve closing body, which together with a valve seat surface formed on a valve seat body forms a seal seat, and spray openings formed downstream of the valve seat surface, and a valve seat support, which accommodates the valve seat body, forms a portion of a valve housing and is fixedly connected to the valve seat body. A plastically deformable sealing element is introduced into an annular gap between the valve seat support and the valve seat body to avoid corrosion and damage of a weld seam.

A ball and a valve seat for a fuel injector, and a method for coating the same are provided to form a Ta—C:H—SiO functional layer having a low frictional characteristic as the outermost layer to reduce a frictional coefficient. A Mo-based material is applied to a bonding layer and a supporting layer for bonding and supporting the Ta—C:H—SiO functional layer is applied to a base material to improve heat resistance. Accordingly, only pure ionic Mo particles are deposited to form the bonding layer and the supporting layer, thereby increasing an adhesive force and a bonding force to improve durability.