Essentially there are two types of screw compressors: (oil-)lubricated and ‘dry’ compressors. MARK only offers oil-lubricated compressors, but for the sake of education we’ll explain the working principle of dry screw compressors as well.
Dry screw compressors, don’t have, as the name might suggest, any lubricants between the screws. The compression process might consist of one or two stages. Each is housed separately. Another difference with lubricated screw compressors is that dry compressors require external timing gears to assure that the rotors operate properly. These timing gears are housed separately, but will need constant lubrication to work.
Lubricated screw compressors - in most cases the lubricant is oil - have a lubricant between the rotating gears. They don’t require external timing gears since oil is injected between the screws. We’ll explain the working principle of an oil-lubricated air compressor in the next paragraph.
Read more about the importance of oil lubrication in our article ‘Why oil is used in a rotary screw compressor’.
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