An engine system, comprising a metal engine valve with a coating that includes a phosphate, an additive delivery apparatus coupled to one or more engine cylinders, and an additive tank with an amount of additive located coupled to the additive delivery apparatus. The additive may include a chemical that reacts with the valve coating to produce a dry film lubricant that may be periodically injected into the engine chambers to provide valve lubrication and protection.

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 fuel system for a gas turbine engine includes a fuel tank, a first fuel pump, an inlet ejector, and an ejector control valve. The first fuel pump includes a fuel inlet and a fuel outlet. The first fuel pump is connected in fluid communication with the fuel tank by an inlet conduit at the fuel inlet. The first fuel pump is connected in fluid communication with an outlet conduit at the fuel outlet. The inlet ejector includes an ejector nozzle disposed within the inlet conduit. The ejector control valve is connected in fluid communication between the ejector nozzle and the outlet conduit, and the ejector control valve is selectively positionable in an open position or a closed position to control a flow of fuel from the outlet conduit through the ejector nozzle to the inlet conduit.

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.