Machines and apparatus for liquefying gases, in particular gas mixtures containing methane, in particular natural gas; compressors for compressing gases or refrigerants; turbines for decompressing gases or refrigerants; valves [parts of motors and engines] for decompressing gases or refrigerants; companders [machines with compression and decompression stages] for compressing and decompressing gases or refrigerants; installations for liquefying gases comprising combinations of the aforesaid machines and apparatus; natural gas liquefying apparatus and machines and components thereof (as far as included in this class); industrial machines for chemical and/or physical treatment of methane containing gas mixtures, in particular of natural gas, comprising combinations of the aforesaid machines and apparatus.
Machinery