Abstract: A spray gun for spraying of abrasive media includes a valve operable by a nozzle needle. The valve is arranged in a gun head and has a nozzle opening. The spray gun has an operating and return device for the nozzle needle. In order for the spray gun to be self-cleaning and to be able to process several components with abrasive material, the valve includes a nozzle channel, which ends in the nozzle opening. The nozzle needle is movably supported in the nozzle channel. At least one bore laterally enters the nozzle channel to supply the media. The bore can be closed off by the nozzle needle, which has an outer diameter almost equal to an inner diameter of the nozzle channel. The length of the nozzle needle in chosen so that when the nozzle needle is in a resting state, the needle extends at least to the nozzle opening of the spray gun.

Abstract: This invention relates to a method and a device (01) for coating the interior wall (14) of a pipe (02) with a curable compound, a spraying device (04) being provided on the device (01) by means of which a directed stream (10) of curable compound can be produced. A centrifugal device (05) which is driven to rotate is provided on the device (01), the stream (10) of the curable compound being directed at the centrifugal device (05), so that the curable compound is thrown by the centrifugal device (05) against the inside wall (14) of the pipe (02) because of the rotational force produced by the rotation.

Abstract: A spray gun, which is suited for spraying of abrasive media, and has a valve operable by means of a nozzle needle, which valve is arranged in the gun head near the nozzle opening, and has an operating and return device for the nozzle needle, has, in order for same to be self-cleaning and to be able to process also several components with abrasive material, a nozzle channel, which ends in the nozzle opening. The nozzle needle is movably supported in said nozzle channel. The nozzle channel has at least one bore laterally entering the nozzle channel and utilized to supply the media, which bore can be closed off by the nozzle needle, which has a diameter equal to a diameter of the nozzle channel. The length of the nozzle needle is chosen in such a manner that when the nozzle needle is in the resting state, it extends at least to the nozzle opening of the spray gun.

Abstract: A compact transportable compressed-air piston engine for paint-spraying devices, dosing pumps, grease guns or the like, makes it possible, without much effort, to carry out various length working strokes of a working piston. A compact engine is obtained by mounting the control in/on the cylinder head or in/on the cylinder bottom with axes extending transversely with respect to a main axis so that stroke changes can be achieved solely by the working piston contacting the valve piston rods of switch valves. In addition, return springs are not needed in the switch valves, which are required for reversing and are operated by the working piston.