When you only need the pressure of 0.3-0.5MPa, if you use the ordinary 0.7MPa machine and decompression to 0.3MPa to use, it means you would waste a lot of electricity.
But with a permanent magnet low pressure and large displacement screw compressor, in the same condition, it will be more reliable and more energy-saving than the ordinary air compressor.
If you buy a 0.7MPa machine and the actual use pressure is 0.3MPa, its working process is usually like this: The screw air-end will compress air from 0.1MPa to 0.7MPa, and then though the pressure reducing valve or other ways to reduce the pressure to 0.3MPa. In short, you need to use 0.3MPa, but you suffer from the power consumption of 0.7MPa, which creates a massive waste of energy!