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Rotary Screw Air Compressors A basic introduction to rotary screw air compressors: Instead of pistons and valves producing the compressed air, rotary screw air compressors use male and female rotors with an extremely small amount of space between them. Air comes in through the intake and mixes with the lubricant and spins through the rotors. Once the air and lubricant pass through the rotors, they are separated through a filter. The air then goes out to the air system or tank and the lubricant is collected in a sump. The larger the rotors, the more volume of air CFM can be produced. Unlike a piston air compressor, most will not build up to pressure and cut off, it will run unloaded venting air to atmosphere for a period of time and once the air demand picks back up, it will start putting the air in the system again. If the air demand is not enough to keep it running, it will eventually shut down. In the right application, this will save energy and money by not having the "hard start" of the motor multiple times per hour.
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