Single stage air-cooled nonlubricated compressors series SLT and single stage air-cooled compressors series LPK may be used on pneumatic conveying systems of bulk materials ( food, feed, pulverized materials, chemical materials, cement lime gypsum, etc.), tank trucks ( to transport liquid food, feed, chemical materials, asphalt, heavy oil, etc.) and stationary equipment (pneumatic operating systems, etc.) . They may be driven by engine of automobile through auxiliary device or universal coupling, by V-belt, by hydraulic device, or by flexible coupling. They may be installed underneath, on top of or on side of the chassis.