A fuel injector 100 includes a nozzle member 60 having a fuel passage 60a leading to an injection port 60b; a valve main body 51 adapted to reciprocate for opening and closing the fuel passage 60a; an elastic portion 56 elastically deformable in closing the fuel passage 60a by movement of the valve main body 51 in a closing direction, the elastic member being attached to one of the nozzle member 60 and the valve main body 51 and adapted to be abutted against the other of the nozzle member 60 and the valve main body 51 to close the fuel passage 60a by moving the valve main body 51 in the closing direction; and a stopper 70 adapted to restrict movement of the valve main body 51 in the closing direction by being abutted against the valve main body 51, the stopper 70 being formed of material different from the nozzle member 60.

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 fuel injection assembly comprising a fuel injector (19) having an injection outlet (19) and a fuel rail (17) in which the fuel injector is adapted to be supported. The fuel injector (19) has a tip (37) having an end from which fuel issuing from the outlet of the fuel injector is discharged. The tip (37) is adapted for location in an injection port (21), the tip being of flexible construction to accommodate some misalignment between the fuel rail (17) and the injection port (21).

Various embodiments include a fluid injector comprising: an injector housing defining a fluid path; a needle within the housing and movable to a closed position and an open position. The needle comprises two axial ends, an end face on the second, and an axial needle section surrounded by the housing. Between the axial section and the surrounding housing, there is a gap comprising at least part of the fluid path. The needle includes a hole extending from the end face and a connecting hole providing fluid connection between the hole and the gap. The valve also includes a plate defining a through-hole. A first valve seat is defined at a surface of the plate facing the end face and adjoining the through-hole and when the needle is in the closed position the through-hole is closed by the end face.

In a valve apparatus, a housing includes a plurality of through holes through which a fluid flows. A first valve member opens and closes a first through hole. A second valve member opens and closes at least one second through hole. A fixed core does not move relative to the housing. A coil forms magnetic field. A first movable core moves integrally with the first valve member. When the coil forms the magnetic field, a magnetic attractive force is generated between the first movable core and the fixed core. A second movable core moves integrally with the second valve member. When the coil forms the magnetic field, a magnetic attractive force is generated between the second movable core and the fixed core. A magnetic constriction portion is provided between the fixed core and the first movable core. The second through hole is opened after the first through hole is opened.

A valve has a valve housing in which a closure element having at least one sleeve section is movable along its sleeve longitudinal axis by an actuator to open and close a fluid connection between a fluid inlet and outlet. The actuator has stationary and movable parts relative to the valve housing. At least the movable parts and the closure element are arranged entirely within an enclosed fluid space between the fluid inlet and outlet. To close the fluid connection spaced first and second seal devices of a double-sealed seat are in sealing contact with equally-spaced first and second counter-seal devices on the valve housing along first and second closed seating lines, respectively. With regard to the at least one double-seal seat, the ratio between first and second areas enclosed by first and second sealing lines in projection along the sleeve longitudinal axis, respectively, is between 6/10 and 10/6.

The present invention relates to an injector for injecting gas, in particular hydrogen, preferably for directly injecting hydrogen, comprising an injector housing for holding injector components, a valve needle movably arranged along its longitudinal axis in the injector housing and configured to selectively close or release an injection opening for the flow of hydrogen therethrough, and a valve, preferably a solenoid valve, which is adapted to transfer the valve needle into a closing or releasing state by a movement along its longitudinal axis. The injector is characterized in that the valve needle is a hollow needle adapted to pass a gas, in particular hydrogen, flowing through the injection port through the interior of the hollow needle.

An electromagnetically-driven injector may include a valve body of an on-off valve biased in a valve-closed direction by a coil spring, which is arranged in a stroking direction of the valve body, and at least one plate spring, which is provided at a right angle in the stroking direction of the valve body and arranged in such a manner as to support the valve body, and keeps a valve-closed state when energization is not provided. The at least one plate spring may include a plurality of plate springs arranged in the stroking direction of the valve body.

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.

A fuel injector 100 includes a nozzle member 60 having a fuel passage 60a leading to an injection port 60b; a valve main body 51 adapted to reciprocate for opening and closing the fuel passage 60a; an elastic portion 56 elastically deformable in closing the fuel passage 60a by movement of the valve main body 51 in a closing direction, the elastic member being attached to one of the nozzle member 60 and the valve main body 51 and adapted to be abutted against the other of the nozzle member 60 and the valve main body 51 to close the fuel passage 60a by moving the valve main body 51 in the closing direction; and a stopper 70 adapted to restrict movement of the valve main body 51 in the closing direction by being abutted against the valve main body 51, the stopper 70 being formed of material different from the nozzle member 60.