The invention relates to an injection nozzle for injecting fuel under high pressure, comprising a nozzle body (2) in which a pressure chamber (9), which can be filled with fuel under high pressure, is formed and in which a conical body seat (25) is formed which opens into a blind hole (32), forming a transition edge (35), from which blind hole a plurality of injection holes (30) originate and the total of the flow cross-sections of all injection holes forms a total injection hole cross-section (A.sub.SL). A nozzle needle (14) is arranged in the pressure chamber (9) so as to be longitudinally movable, said nozzle needle interacting, by means of a conical sealing surface (27), with the body seat (25) in order to open and close a flow cross-section, wherein the nozzle needle (14) has, on the end thereof facing the body seat (25), a needle tip (28) which protrudes into the blind hole (32) when the sealing surface (27) contacts the body seat (25). A seat cross-section area (A.sub.S) is formed between the sealing surface (27) and the transition edge (35) when the nozzle needle (14) is raised from the body seat (25), through which seat cross-section area fuel can flow from the pressure chamber (9) into the blind hole (32). The needle tip (28) is conical and has an opening angle (13) that is smaller than the opening angle (a) of the conical sealing surface (27), and the blind hole (32) has a conical portion (132) having an opening angle (a) that is formed between the transition edge (35) and an intermediate edge (36), wherein the needle tip (28) is arranged in a partial stroke of the nozzle needle (14) at the height of the conical portion (132) of the blind hole (32).

A direct injection fuel injection valve includes a valve casing housing therein a valve member and fitted into an engine main body of an internal combustion engine. The casing includes: a tubular case member; and a valve seat member joined to one end part thereof and having a valve seat and a fuel injection hole. The valve member can be in contact with and detached from the valve seat. The injection hole is opened and closed by cooperation between the valve seat and the valve member. At least part of the valve seat member is exposed to a combustion chamber of the engine main body. Fuel can be injected into the combustion chamber via the injection hole. The valve seat member is formed from a martensitic stainless steel having a PI value of at least 19, containing at least N, and having a C content of no greater than 0.3%.

A fuel injector for supplying fuel to a fuel consuming devise includes a fuel inlet for receiving the fuel, a nozzle tip for dispensing the fuel from the fuel injector, a conduit for communicating the fuel from the fuel inlet to the nozzle tip, a valve seat, and a valve selectively seatable and unseatable with the valve seat for selectively preventing and permitting fuel flow out of the nozzle tip. The nozzle tip includes a non-circular recess on a downstream side thereof and a metering hole on an upstream side thereof opening into the non-circular recess to allow fuel to exit the nozzle tip, the metering hole having a smaller area than the non-circular recess.

The invention relates to a pressure regulator for a high-pressure ramp of a system for injecting fuel into an internal combustion engine, comprising a solenoid valve element (10) which receives an electromagnet (40). The electromagnet controls a needle (20) that closes a valve seat (30) which is connected to a high-pressure inlet and opens into a discharge chamber (13), said discharge chamber communicating with a liquid recirculation system (5) by means of outlet openings (14). The rear face (12) of the solenoid valve element (10) receives a coil (40) which controls the opening process of an armature (41) that is rigidly connected to the needle (20) and is subject to a closing return spring (25). The discharge chamber (13) is located on the front face (11) of the solenoid valve element (10) on the axis (XX) of the needle (20), and the discharge chamber surrounds the needle. A cavity (15) passes through the discharge chamber, said cavity receiving an inlet valve element (50), and a bore (51) which opens into the valve seat (30) passes axially through the inlet valve element. The discharge chamber (13) through which the needle (20) passes axially and the outlet openings (14) which are connected to the liquid recirculation system open transversally into a wall (131) in the discharge chamber (13) .sub.in below the upper part (132) of the chamber. The regulator is characterized that the regulator comprises an annular expansion (70) of the discharge chamber (13) below the outlet openings (14) along the extension of a conical surface (31), which forms the valve seat (30) and an annular dead volume (70), above the surface (54) of the valve element (50), which forms the base of the discharge chamber (13) and has the valve seat (30) in the center of the valve element.

An injector includes a nozzle body extending along a longitudinal axis and at least one spray hole extending through a portion of the nozzle body to output a fluid from the injector. The spray hole includes at least one groove. The groove is configured to facilitate efficient mixing of the fluid with air or other surrounding materials for enhanced performance of the injector and/or other components associated with the injector.

A fuel supply apparatus includes a valve seat, a valve element, and a sealing member formed of a circular-disc or annular shape placed in the valve element to face the valve seat. The valve element includes an outside facing surface corresponding to a surface facing the valve seat and formed more outside than the sealing member in a radial direction thereof. The sealing member includes an annular protrusion protruding toward the valve seat more than the outside facing surface, and a flat portion formed between the outside facing surface and an distal end of the protrusion on a side toward the valve seat in a central axis direction of the sealing member so that the flat portion will contact with the valve seat during valve closing.

A needle includes a first seal portion, which is formed at an end portion of the needle located on a side where an injection hole is placed, and a second seal portion, which is formed on a side of the first seal portion where a stationary core is placed. When a boundary between a first outer wall of the first seal portion and a second outer wall of the second seal portion is lifted away from or is seated against an inner wall, the injection hole is opened or closed. Thereby, a seat diameter of the boundary and the inner wall is stabilized, and a change in a fuel injection quantity caused by aging can be reduced. Furthermore, the first outer wall of the first seal portion is shaped into a form of a spherical surface.

A fuel injection valve in which a valve element is formed at a distal end thereof with a flat portion 13c which is substantially parallel with an injection hole plate 11, injection hole entrances 12a are arranged inside an imaginary envelop 15 along an intersection between an extension 10b of a downstream inner wall of a seat portion of a valve seat and an upstream plane 11c of the injection hole plate and outside the flat plane at the distal end of the valve element, and the relation between the vertical distance h between the flat plane at the distal end of the valve element and the upstream plane of the injection hole plate with the valve opened and the diameter d of the injection hole entrance is h<d, and the injection hole 12 is formed to be inclined by a predetermined angle with respect to the direction of the thickness of the injection hole plate.

An object of the present invention is to provide a fluid control device with an improved effect of suppressing blowhole generation. Therefore, a component for a flow rate control device of the present invention includes: a first component 140 (A); a second component 107 (B) fixed to the first component by a press-fitting portion 802; a butt-welded portion 803 connecting the first component and the second component; and a first gap 1001 and a second gap 1002 formed between mutually opposing surfaces of the first component and the second component. The first gap is provided on a side of the press-fitting portion with respect to the second gap between the press-fitting portion and the butt-welded portion, and is formed in a direction intersecting a press-fitting direction. The second gap is provided on a side of the butt-welded portion with respect to the first gap between the press-fitting portion and the welded portion, and is formed in a direction intersecting the first gap.

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.