The industry involves: 

 Deep and cold air separation system, molecular sieve purification system, low-temperature liquefaction device, storage tank/tank, air compressor, turbine, pressure regulating station, natural gas, oxygen device, etc. 

 Application product type: 

 Medium/high pressure regulating valve; medium/high pressure cut-off ball valve; oxygen valve; multi-stage pressure-reduced regulating valve; deep-cooled angle aluminum regulating valve; deep-cooled switch valve; V-shaped ball valve; deep-cooled regulating butterfly valve, etc.