A high-pressure fuel pump for a fuel delivery system of an internal combustion engine includes a pressure limiting valve positioned between an outlet and an inlet of the pump. The valve includes a spring-loaded closing element and a closing body that radially holds the closing element in place, and that has a concave receiving portion configured to at least partially receive the closing element. The receiving portion has a radially outer first area with a first opening angle, and a radially inner second area with a second opening angle larger than the first opening angle. The first area and the second area are located outside of a contact region between the closing element and the closing body.

A valve device for controlling or metering a fluid includes a housing, a flow duct formed in the housing, and a valve body arranged in the flow duct. The valve body has a sealing section which, when the valve device is closed, rests on a sealing seat on the housing. The sealing section and sealing seat together form a sealing region. When the valve device is closed, a decay chamber is defined immediately upstream of the sealing region in the flow duct. The decay chamber is bounded by a baffle wall that is tilted with respect to the normal to the sealing region at an angle of at most 15 in the flow direction to 60 counter to the flow direction.

A fuel injector for controlling delivery of gaseous fuel into an intake passage of an internal combustion engine defines a fuel flow passage extending in a direction of fuel flow from an inlet to an outlet. An actuator moves a normally closed valve member from a closed to an open position. An annular valve seat is inclined relative to a direction of fuel flow, causing gaseous fuel to flow against the direction of fuel flow and act on the valve member in an opening direction when said actuator is energized to move the valve member to the open position. The valve member includes an extension including helical ribs defining helical channels, the helical ribs bearing on an inside surface of an outflow passage to guide axial movement of the valve member and said helical channels imparting a centripetal acceleration to said gaseous fuel as it flows through the outflow passage.

There is disclosed a solenoid valve for a fuel injection system, in which solenoid valve a closing element which interacts with a valve seat in order to close and open the solenoid valve is actuated by a control pin, the control pin being formed by way of a solenoid plunger. Furthermore, a high pressure fuel pump is disclosed which has a solenoid valve of this type.

A fuel injection valve includes a nozzle needle that opens or closes an injection hole communicating with an internal combustion engine, and a high-pressure fuel is introduced into a control room to urge the nozzle needle to close the injection hole. An orifice body includes a discharge passage through which the fuel is discharged from the control room to a low pressure portion, and an orifice-body sheet surface that is flat and surrounds a downstream end part of the discharge passage. A valve body contacts with or separates from the orifice-body sheet surface to close or open the discharge passage. A chamfered part is provided on a corner part in which the orifice-body sheet surface intersects with the discharge passage.

A method for producing a valve seat ring via powder metallurgy may include compacting a powder mixture including 4% by weight to 16% by weight particles of cobalt to form the valve seat ring. The method may also include sintering the powder mixture after compacting the powder mixture. Before compacting the powder mixture, 80% of the particles of cobalt may have a particle diameter of approximately 4.4 m to 17.5 m.

An object is to suppress cavitation generated at a distal end portion of a seat face when a valve body and a seat portion collide with each other. In a relief valve of a fuel pump, an intersection between the seat face and a flow channel hole is formed at a position more distant than the seat portion formed of the valve body in a valve closing state and the seat face in order to suppress generation of cavitation bubbles when the valve body improves and releases high-pressure fuel.

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.

A valve seat has a fixing portion fixed to the body, an abutting portion where the suction valve body abuts, and a constricted portion which is provided between the fixing portion and the abutting portion and has rigidity lower than that of the fixing portion and the abutting portion.

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.