A fluid injector is shown and described, including an injector housing and an armature which is coupled to a valve needle. A first bellow surrounds a first space. A first axial end of the first bellow is connected to the injector housing and a second axial end of the first bellow is connected to a first axial side of the armature. A second bellow surrounds a second space. A first axial end of the second bellow is connected to a second axial side of the armature and a second axial end of the second bellow is connected to the housing.

The invention relates to an electromagnetically actuatable gas valve for metering a gaseous fuel into a suction tract of a motor, in particular a gas or diesel gas motor, comprising a valve seat (1) which is designed as a flat seat and which has multiple annular webs (3) that are arranged in a concentric manner and are connected via at least one radially running web (4) in order to delimit circular or semicircular through-flow openings (2). The electromagnetically actuatable gas valve further comprises a movable valve plate (5) which sealingly interacts with the valve seat (1) and which has multiple annular sealing webs (6) that are arranged in a concentric manner and can be brought into an overlapping arrangement with the circular or semicircular through-flow openings (2) of the valve seat (1). According to the invention, the rigidity of the valve seat (1) and/or the valve plate (5) is substantially constant in the radial direction, the rigidity of the valve seat (1) being greater than the rigidity of the valve plate (5). The invention further relates to a method for increasing the seal of an electromagnetically actuatable gas valve.

A fuel injector is disclosed for use in an engine system. The fuel injector may have a body, a first piston slidingly disposed in the body and having a first pressure area, and a second piston slidingly disposed in the body and having a second pressure area. The fuel injector may also have a hydraulic coupling connecting the first and second pressure areas, and a piezo stack connected to move the first piston. The fuel injector may additionally have a valve needle configured to engage and be moved by the second piston. The first pressure area may be larger than the second pressure area.

A system according to the present invention provides for a liquid injected propane fuel system for internal combustion engines which provides for a fuel pump assembly, a base tank valve adaptor, a distribution assembly, and rail assemblies; a first embodiment of the liquid injected propane fuel system may provide for proportional fuel injection, a second embodiment may provide for direct fuel injection providing for at least substantial reduction in evaporation (EVAP) emissions, is disclosed, a third embodiment of the liquid injected propane fuel system may provide for a combination of proportional fuel injection and direct fuel injection; the invention comprising at least one of a fuel tank, an external fuel tank, a distribution block, a fuel rail and a ECU.

An injection nozzle for an internal combustion engine, comprising a nozzle body defining a nozzle body bore, a blind end region of which defines a set of nozzle outlets. An injection valve needle is slidably received in the nozzle body bore and engageable with a seating arrangement to control fuel flow. The seating arrangement includes a seating insert received in the nozzle body bore and positioned upstream of the nozzle outlets, the seating insert defining an upper valve seat. The injection valve needle comprises a first seating portion and a second seating portion which are axially spaced along the injection valve needle. The first seating portion is engageable with the upper valve seat defined by the seating insert; and the second seating portion is engageable with a lower valve seat defined by the nozzle body bore.

A fuel injector for gaseous fuel is provided. The fuel injector includes a valve assembly with a fuel flow valve and a second valve. The fuel flow valve is actively controlled to permit and prohibit gaseous fuel flow through the fuel injector. The second valve is spaced from the fuel flow valve and passively controlled to open in response to the gaseous fuel flow though the fuel flow valve, and to close when the gaseous fuel flow is terminated by closing the fuel flow valve.

A gas injector for injecting a gaseous fuel. The gas injector includes a solenoid actuator having an armature, an internal pole and a coil; a closing element, which unblocks and seals a gas path at a valve seat, the armature being connected to the closing element; a sealed lubricant chamber, which is filled with a lubricant, and in which the armature is situated, the lubricant ensuring lubrication of the armature; and a flexible sealing element, which seals the lubricant chamber with respect to the gas path, a damping device being situated in the lubricant chamber.

Embodiments of the apparatus relate to a tool configured to repair and recondition a fuel injector seat. The tool includes a body having a working end and a rotary end, a rod extending through the body, wherein a first portion of the rod is exposed at or near the rotary end and a second portion of the rod is exposed at or near the working end, and a machining bit attached to the rod at or along the second portion of the rod, wherein the machining bit is configured to perform work on a fuel injector seat.

A fuel injector for gaseous fuel is provided. The fuel injector includes a flame arrestor and, in certain embodiments, a choke orifice configured to prevent or reduce flame propagation from the combustion chamber through the fuel injector to internal components housed within the fuel injector. The reduction or prevention of flame propagation from the combustion chamber reduces exposure of fuel injector components to temperature changes, improves fuel injector robustness, and increases operating life.

A fuel injector for a gaseous fuel and having: an injection nozzle; a support body with a tubular shape, which is provided with a feeding channel therein, ending in the injection nozzle; an injection valve; a tubular sleeve, which is arranged around an end part of the support body, entirely contains the shutter therein, and ends with the injection nozzle; and an actuator, which is configured to move the shutter. An injection duct, which is created when the injection valve is in the open position, has a converging initial segment, in which an area of the injection duct progressively decreases from a first maximum value at the beginning of the injection duct to a minimum value, and a diverging final segment, in which the area of the injection duct increases from the minimum value until reaching a second maximum value.