GB 19153-2019 standard specifies the energy efficiency class, energy efficiency limit value and test and calculation method of the positive displacement air compressor. It is suitable for all kinds of positive displacement air compressor, including fuel injection rotary, variable Rotation speed fuel injection rotary, reciprocating piston and other types. It covers the range of driving motor Power from 0.55 kW to 630 kW and exhaust pressure from 0.25 MPa to 1.4 MPa. This standard aims to guide manufacturers and users to evaluate and select air compressors to improve the energy efficiency and energy saving performance of equipment by defining energy efficiency classes and limiting energy efficiency values. The standard refers to a number of relevant national standards, ensuring the conformity and accuracy of assessments and tests, and helping to drive the air compressor industry towards higher energy efficiency.