... substations of industrial and mining enterprise, lubricating oil warehouses, tractor stations as well as petroleum, chemical industry, metallurgy, ... vacuum lubricating oil regeneration purifier 4. Engine oil purifier Series LYE: Zhongneng vacuum engine oil purifier 5. Diesel ... regeneration device 7. Muti-Functional oil purifying machine Series ZYB: Zhongneng Muti-Functional oil purifying machine 8. ...