The basic criteria for selecting an air compressor are economy, reliability, and safety.
Firstly, the level of exhaust pressure and the size of exhaust volume should be considered. For general-purpose pneumatic compressors, the exhaust pressure is typically 0.7 MPa, while the old standard was 0.8 MPa. Currently, there is a type of compressor on the market with an exhaust pressure of 0.5 MPa. From a usage perspective, this is unreasonable because the pressure margin for pneumatic tools is too small, making it unusable if the gas transmission distance is slightly longer. Additionally, from a design perspective, such a compressor is designed as a single-stage compressor, which results in a large compression ratio, easily causing excessively high exhaust temperatures, leading to carbon buildup in the cylinder, and potentially causing accidents. If the user requires a compressor with pressure greater than 0.8 MPa, it generally needs to be specially manufactured, and forced pressure increase methods should not be used to avoid accidents.