... connecting pipe and plant foundation. Valve of Purifier and rectification column adopts stainless steel or copper material,no rust,very ... beautiful,fill in the excellent keeping warm material in the rectification column,has minimal cooling lost,Shorten starting time. This ... compressor 1 set ,Purifier 1 set ,Turbine expander 1 set,Rectification Column 1 set ,Refrigerator 1 set , Liquid Oxygen Pump ...