The DTA/DTR range has a connecting thread on the pressure side and a protective cap on the suction side. The aspirated air is cleaned by an inbuilt fine micro filter. The carbon dust caused by the scoring of the discs can also be separated by an integral filter if necessary. A fan between the compressor housing and the motor provides intensive air cooling. The compressor housing is located in a sound cover. The compressed air is cooled by a cooling segment. The machines are driven by standard flanged three-phase motors using a coupling. The pressure regulating valve is used to set the pressure to the required values with an upper limit.