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.

A discharge valve includes: a valve main body that slidably contacts an inner peripheral wall of a tubular portion; and a primary passage that is formed at the valve main body and is located between the valve main body and the inner peripheral wall of the tubular portion. A stopper includes: a stopper main body that is formed separately from the tubular portion while the stopper main body is located on a side of the discharge valve that is opposite to the discharge valve seat; a movement limit surface that is configured to limit movement of the discharge valve in a direction away from the discharge valve seat; and a secondary passage that is formed at the stopper main body.

The present invention relates to a seat plate for an injector, comprising: a planar main body having a first flat side and a second flat side; a passage, which extends through the planar main body from the first flat side to the second flat side; and an indentation region in the first flat side, which indentation region surrounds an opening of the passage. The seat plate is characterised in that a plurality of webs are formed in the first flat side through the indentation region, the ratio of length to width of each web lying in the range of 2.5-3.5:1, preferably in the range from 2.7-3.3:1, more preferably in the range from 2.9-3.1:1.

A fuel injector assembly for a fuel-actuated fuel injector includes an injector body, and an injection control valve assembly. The injector body includes therein a low-pressure fuel passage extending from a clamping face to an armature cavity to convey spent actuating fuel to the armature cavity. The fuel injector assembly also includes a flushing drain formed by the injector body and fluidly connected to at least one of a valve pin bore in the injector body or the armature cavity. The flushing drain forms, together with the low-pressure fuel passage and the armature cavity, a cooling circuit for the spent actuating fuel. The flushing drain extends to a drain opening formed in an outer body surface of the injector body. Related methodology is also disclosed.

An object of the invention is to provide a fuel supply pump that can simultaneously prevent cavitation erosion in a relief valve seat portion at the time of increasing the pressure and reduce a maximum pressure when releasing an abnormally high pressure. Therefore, in the fuel supply pump, a relief valve mechanism includes a seat portion and a relief valve seated on the seat portion, and sets a set discharge pressure to 30 MPa or more. A seat angle of the seat portion is formed to be 40° to 50°, and a set valve opening pressure of the relief valve mechanism is set to 2 MPa or more than the set discharge pressure.

The present invention provides a common rail fuel injector for a diesel engine. A valve seat of a fuel injector control valve adopts a T-shaped structure with a slot hole (2001c), and liquid passes through the slot hole of the valve seat of the control valve to control hydraulic pressure at a tail portion of a needle valve. A T-shaped pilot valve seat adopts a floating mounting structure: a large end of the T-shaped control valve seat faces downwards; a long column of the T-shaped pilot valve seat is slidably assembled in a central hole of a fuel injector body; a large end of the T-shaped control valve seat and the central hole of the fuel injector body are provided with a seal seat surface matched with each other.

A fuel injection device has a valve body, a drive portion, a nozzle needle, and a control valve body. The valve body defines a control chamber, a valve chamber and a low pressure communication passage. The nozzle needle is displaced due to a fuel pressure variation in the control chamber to open/close an injection port. When the control valve body sits on an upper seat surface, a low pressure communication passage is closed so that the valve chamber is fluidly disconnected from the low pressure chamber. The control valve body defines a gap restriction on the upper seat surface. A flow passage area of a sub orifice provided to the low pressure communication passage is smaller than a flow passage area of the gap restriction.

The invention relates to an antiwear-coated metal component (1), in particular for a ball valve (6), the tribosurface of which component is at least partially provided with a multi-layer antiwear coating (2). The antiwear coating (2) has at least a metal adhesion layer (3a), an adhesion-promoting layer (3b) and at least one first cover layer (3c). The adhesion-promoting layer (3b) comprises a carbide-forming metal or a boride-forming metal. The at least first cover layer (3c) comprises a hydrogen-free tetrahedral carbon. The invention further relates to a method for applying an antiwear coating (2) to a metal substrate (9) in order to produce an antiwear-coated metal component (1) of this type. The invention further relates to a ball valve, comprising an antiwear-coated metal component (1) of this type and an antiwear coating (2).

Provided is a fuel injection valve which can be easily processed and can realize sufficient atomization while suppressing spreading of spray. In the fuel injection valve according to the present invention, when a nozzle plate 6 and a first direction 15a-1 in which fuel is sprayed are projected onto a virtual plane perpendicular to a central axis line of the fuel injection valve along an opening and closing valve direction of a valve body and a first orthogonal coordinate system having an X1 passing through a center O1 of the nozzle plate 6 and along the first direction 15a-1 and a Y1 axis passing through the center O1 of the nozzle plate 6 and perpendicular to the X1 axis is virtualized on the virtual plane, an introduction passage 11a-1 is inclined so that a straight line segment 14a-1 connecting between a central point 40a-1 of an upstream side end portion and a center Oa-1 of an inlet opening surface of a fuel injection hole 13a-1 is positioned on the Y1 axis side with respect to a straight line 30a-1 passing through the central point 40a-1 and the center O1 of the nozzle plate 6.

A valve seat has an inner passage and outer passages. A suction valve member has first passages and a first projection portion that guides, to the first passages, the fuel that flows from a pressure chamber at the time of valve opening. Therefore, an action force by the dynamic pressure applied to the suction valve member in the valve closing direction is reduced. An action force by the pressure of fuel that flows into pressure equalization grooves counterbalances the action force by the dynamic pressure of the suction valve member. Therefore, self-closing by the dynamic pressure can be inhibited, and the maximum output of an electromagnetic driving unit can be reduced. Fuel flows through a passage radially outside the suction valve member and the first passages. A fluid passage area is securable even when a lift amount of the suction valve member is small.