A rotary-screw compressor is a kind of gas compressor, such as for example an air flow compressor, that uses a rotary-type positive-displacement mechanism. They are generally used to replace piston compressors where large volumes of high-pressure atmosphere are required, either for large commercial applications or 
to operate high-power surroundings tools such as jackhammers and impact wrenches. For smaller sized rotor sizes the inherent leakage in the rotors becomes much more significant, becoming less useful than piston types for smaller volume air compressors.
The gas compression procedure for a rotary screw is a continuing sweeping movement, so there is very small pulsation or surging of flow, as occurs with piston compressors. This also allows screw compressors to become significantly quieter and produce significantly less vibration than piston compressors.
oil-free air compress Ever-power Rotary Screw Air Compressor. 230 volt with built in air dryer and 80 gallon tank.Unit offers 13857hours on it. Unit was lately serviced with new separator filters, air filter, essential oil filter, and new oil. Unit has been examined and functions great. Free freight delivery. Feel free to get in touch with me with any questions you may have.
Item specifics
Rated Voltage: 230 V
Brand:Ever-power
Rated Hp: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