The main engine of the screw air compressor consists of rotor, cylinder, bearing and shaft seal. The efficiency of the screw air compressor depends on the rotor, also the life of the screw air compressor depends on the bearing and the shaft seal. Only Silk can produce a whole pedigree of rotor in the world and the diameter of 220KW rotor can reach 386cm The bearing of screw air compressor generally use SKF, and low peed, the bearing no extra force, the work-life of the screw air compressor will be longer, Silk compressor's rotor is direct driven, no speed gear,lower speed, higher efficiency. So the work-life of Silk compressor is longer than other brand compressor Silk compressor can continue to provide stable and efficient power for the mechanical equipment and support the equipment with high speed and stability.