Abstract: A system for modulating air flow in a gas turbine engine is provided. The system may include a seal wall comprising an opening, a seal door configured to slideably engage the seal wall, and an actuator configured to move the seal door over the opening. In various embodiments, the system may include a surface forward of the seal door. The seal door may be configured to seal a passage through the surface and the opening of the seal wall. A track may be disposed under the seal door. The track may comprise cobalt. Rollers may be coupled to the seal door with the rollers on the track. The seal door may comprise a nickel-chromium alloy. A sync ring may be coupled to the seal door. The actuator may be coupled through the sync ring to the seal door.

Abstract: High pressure natural gas enters the regulator at the inlet port and is directed through a filter to a passage in the valve body and into the inner chamber of the valve body. The valve means which controls the high pressure gas as it expands past a valve seat and into the low pressure chamber of the regulator body, is spring mounted in a bushing to prevent undesired vibrations. The expanded and colder low pressure natural gas is directed through a nozzle to the outlet port of the regulator body. The outlet port has a bypass orifice that leads to the diaphragm chamber. Pressure variations in the diaphragm chamber control the movement of the valve means coupled to the diaphragm means.

Abstract: A fuel supply module for furnishing gaseous fuel to a liquid cooled internal combustion engine includes a pressure regulator for reducing gas pressure from a relatively higher tank pressure to a relatively lower pressure required for induction into an engine, and a heating chamber surrounding at least part of the pressure regulator. The flow of liquid coolant into the module is controlled by means of a temperature controller which senses the temperature of the coolant within the heating chamber and which controls the amount of coolant flowing through the heating chamber in response to the sensed temperature so as to control the amount of which is transferred to the gas flowing through the fuel supply module.

Abstract: A fuel supply system for a gaseous fueled automotive engine has means for damping pressure waves occurring within the fuel line between the fuel tank and the engine. In a preferred embodiment, acoustical barriers, such as annular rings, are secured to the inside of the fuel rail for partially transmitting and partially reflecting the pressure waves so that wave amplitude is decreased. An alternative embodiment comprises an acoustical barrier in the fuel line having a cylindrical section with a diameter larger than that of the fuel line. Baffles, possibly annular rings, within the cylindrical section also serve to damp the pressure waves. The acoustical barrier may also be composed of a conical section with diameters equal to that of the cylindrical section on one end and the fuel line at the other end. Acoustical barriers placed in both the fuel line and the fuel rail also effectively damp the pressure waves.