Screw Compressors

Rotary compressors are most commonly purchased today and are now the workhorse of American industry. They are most commonly used in sizes from about 30-200hp. The most common type of rotary compressor is the helical twin screw type, also known as rotary screw or helical lobe. Meshing male and female screw rotors in opposite directions and trap air reducing the volume of the air long the rotors to the air discharge point.

Rotary screw compressors come in oil-less or oil flooded models. Oil less compressors have the advantage of not contaminating air for sterile air requirements. However the oil in an oil flooded compressor acts as a sealant between the male and female rotors and carries away heat from the inside of the compressor. This makes the oil flooded compressor more efficient.

Rotary screw compressors have low initial cost, compact size, low weight, and are easy to maintain. Rotary screw compressors are available in sizes from 3-600 hp and may be air or water cooled.

• Atlas copco screw GA / XA series
• Chicago pneumatics India
• Elgi equiptments SC series
• Demag SC series
• Worngthon
• Kaeser