The invention relates to a fuel injector arrangement (1) comprising a number of fluid supply paths (29, 31, 39), namely, a first (29), a second (31) and a third fluid supply path (39). The fuel injector arrangement (1) has a first switching device (43) in the second fluid supply path (31). Said first switching device, controlled by the fluid pressure in the third fluid supply path (39), opens or blocks the second fluid supply path (31). The fuel injector arrangement (1) has a second switching device (49) in the first fluid supply path (29). Said second switching device, controlled by the fluid pressure downstream of the first switching device (43) in the second fluid supply path (31), opens or blocks the first fluid supply path (29).

Rods for increasing pressure within an oil reservoir of an engine are described. In some embodiments, the rod includes a front end with a front flange and a rear end with a rear flange to assist with centering the rod within the oil cavity. The rod may be comprised of a front section that removably attaches to a rear section via a connector screw and the connector screw may be long enough to prevent the connector screw from backing out when the rod is in the oil cavity. Methods of using and installing the rod are also described.

A fuel valve includes a housing, a nozzle with nozzle holes opening to a volume inside the nozzle at the front end of the housing, a gaseous fuel inlet port in the housing connected to high pressure gaseous fuel, an axially displaceable valve needle received in a longitudinal bore in the housing, and rests on a valve seat in a closed position and has lift from the valve seat in an open position, the valve seat placed between a fuel chamber and an outlet port, the fuel chamber connected to the fuel inlet port, the outlet port connected to the volume in the nozzle, an actuator system for moving the needle between the closed and open positions, an ignition liquid inlet port connected to high pressure ignition liquid, and a conduit connecting the ignition liquid inlet port to the fuel chamber, the conduit including a fixed flow restriction.

A novel in-cylinder fuel injector has been created for internal combustion engines using gaseous fuels such as hydrogen and low-carbon alternatives. This injector enhances the reliability and fuel efficiency of both spark-ignited and compression-ignition engines. The injector's innovative design encompasses a poppet-style valve for fuel injection and a fuel supply valve to govern fuel flow. Furthermore, it incorporates a distinct lubrication system that caters to the valve, seat, and sliding surface. Additionally, the injector includes valve actuators and a control system, effectively managing fuel injector actuation, injection timing, quantity, and valve actuation sequence. Notably, the design also integrates a lubrication system with a control valve.

A pressure pulse injector can include an accumulator, valves, and a control system. The control system can receive parameters, including a maximum pressure and target distance, about a flowline. The control system can determine a change in pressure for a pressure pulse based on the parameters. The control system can determine a pressurization level for fluid in the accumulator. The control system can transmit the pressure pulse into the flowline. The control system can determine, using a reflected pressure pulse, information about an anomaly in the flowline.