A rotary-screw compressor is a type of gas compressor, such as for example an surroundings compressor, that uses a rotary-type positive-displacement system. They are generally used to displace piston compressors where large volumes of high-pressure air are required, either for large industrial applications or to operate high-power atmosphere tools such as jackhammers and influence wrenches. For smaller rotor sizes the inherent leakage in the rotors becomes much more significant, becoming less practical than piston types for smaller sized volume air compressors.
The gas compression process of a rotary screw is a continuing sweeping motion, so there is quite little pulsation or surging of flow, as occurs with piston compressors. This also allows screw compressors to become considerably quieter and 
produce significantly less vibration than piston compressors.
Ever-power Rotary Screw Atmosphere Compressor. 230 volt with built in air dryer and 80 gallon tank.Unit has 13857hours on it. Unit was recently serviced with new separator filters, air scroll air compressor filter, essential oil filter, and new oil. Unit has been examined and works great. Free freight delivery. Feel free to contact me with any questions you may have.
Item specifics
Rated Voltage: 230 V
Brand:Ever-power
Rated Horsepower:15 hp (11 kW)
Power Supply:Electric Airflow Volume (CFM): 60
Compressor Type:Rotary Screw
Air Tank Capacity: 80 gal
Motor Hp:10.5 to 30
Current Phase: 3 Phase