When considering the purchase of an air compressor there are three determining factors: application, operating requirements, and budget. Rotary compressors are the optimal compressor choice for continuous duty requirements such as auto body, paint, and plant air. Rotary compressors are typically available in two styles: rotary screw or rotary vane. Rotary screw compressors are often the most commonly applied rotary compressor. Depending on the manufacturer's philosophy, rotary screw compressors vary in footprint, rotor speed, motor speed, and drive method.
Vane compressors, also known as Rotary Vane Air Compressors, are one of a variety of types of compressors available. Within these compressors, compressed air moves from an area of high pressure as air enters the compressor to an area of relatively low pressure as the air exits the compressor (usually back into the atmosphere). As the air moves inside the compressor, it moves the vanes, causing a the vane-housing shaft to rotate. Vanes inserted into the housing slide in and out, depending on where they are in the cycle. Centrifugal force ensures that the vanes are always kept in contact with the inside of the outer cylinder, creating an air-tight seal.
Rotary-screw compressors are a type of gas compressor that uses a rotary-type positive-displacement mechanism and are commonly used for large industrial applications or to operate high-power air tools such as jackhammers. Rotary screw compressors provide continuous compressed air for precision tasks. They are extremely efficient and very quiet.