Abstract: Injection mechanism for powder and the like comprising a movable disc (II) with a number of throughholes (6) and two stationary members (I, III), each having a number of openings (1,2 and 3, 4, 5) communicating with a powder supply, a propellant gas source and a powder receiving unit, respectively, wherein the two faces of the disc each faces a closely mating face of each of the members and wherein in defined relative positions holes (6) at the disc (II) are in alignment with openings (1-5) in the members (I, III). The surfaces of the stationary members (I, III) presented spaced apart depressions (7) communicating with an adjustable pressure oil source and an adjustable spring action device acts against the members with opposite direction.

Abstract: In a process for recovering mechanical work in a heat engine there is used as a working medium in the heat engine a gas to which vapor is added having a H-value lower than the H-value of the gas, the gas being caused to absorb the condensation heat from the vapor by condensation of the vapor under essentially isothermal expansion. A heat engine for carrying out the process comprises; an isothermal compressor to which a liquid injection mechanism is connected; an isentropic compressor; an expansion machine to which a vapor generator is connected; and at least one additional expansion machine with liquid separator; said compressors and expansion machines being included in a closed circulation system for the gas serving as a working medium.