What industry does gas compression machinery manufacturing belong

Gas compression machinery manufacturing belongs to the general equipment manufacturing industry. According to the "National Economic Industry Classification and Code" formulated by the National Bureau of Statistics, gas compression machinery manufacturing is clearly classified in the general equipment manufacturing industry, and its statistical four-level code is generally C3442 (it may vary according to different versions, such as C3542 in the GB/T 4754-2002 version). This industry is mainly involved in the manufacture of mechanical equipment that compresses gas to increase its pressure to a specific value. Products include air compression machinery such as reciprocating piston compressors, screw compressors, etc., and other types of gas compression machinery. These devices are widely used in petroleum, chemical, pharmaceutical, food processing and other industrial fields, as well as in refrigeration and air conditioning systems.