Screw compressors are a lot more quiet compared to piston compressors.
Screw compressors are designed to work continuously.They can run 24/7, 365 days a year. They don't like standing still, or run just a little bit every day, it makes them rusty.
Piston compressor are better for intermediate use. When you use air only once a day (workshop) or when you don't need high air flows. Piston compressors can also run 24/7 (the better/more expensive ones) but this is seen only in some cases (for example 30 bar or higher pressure).
Also, the capacity of screw compressors is usually much higher compared to piston compressors.
The gas compression process of a rotary screw is a continuous sweeping motion, so there is very little pulsation or surging of flow, as occurs with piston compressors.That's why screw compressor are better than piston compressor.
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