Utilizing pressurized gas as the driving force, the turbo expander outputs mechanical energy, which directly drives the coaxial compressor. This design integrates the functions of the turbo expander and the compressor, and such expanders are widely applied in process systems and equipment such as air separation, nitric acid production, and pressure boosters. The CTC series expanders can be flexibly customized according to specific user requirements to adapt to the pressure reduction and boost needs of different process systems, thereby improving the user's comprehensive energy utilization efficiency.