Abstract: An emergency oxygen supply system, particularly in an aircraft, has an oxygen supply conduit with a conduit junction. This conduit junction is formed by a valve, which forms a flow path from an oxygen inlet to two oxygen outlets, wherein the valve is designed in a manner such that one of the oxygen outlets may be selectively closed.

Abstract: A pressure regulation device is provided, in particular for an oxygen emergency supply system in an aircraft. The device includes at least two parallel conduits in each of which at least two controllable valves are arranged in series. Further, a pressure sensor is arranged on the exit side of the valve arrangement, for the detection of the actual pressure value, and a controller is provided, which is signal-connected to the pressure sensor and controls the valves.

Abstract: A method of carburizing a metal workpiece and a carburizing apparatus in which the workpiece, generally of steel, is introduced into an annealing oven and subjected to a high temperature in the presence of a carbon-containing gas mixture as a result of which the workpiece is hardened. According to the invention, one or more of the carbon-containing gas components of the mixture effective upon the surface of the work-piece, can be periodically and impulsively injected into the gas mixture for sudden increases in carbon potential followed by longer diffusion phase.