When various machine aggregates of steam turbine, hydraulic turbine are in operation, and their turbine oil which used to cool, lubricate and regulate the speed is easily to be contaminated and form more moisture, impurities, emulsifying etc, which badly damage the security and the lifetime of equipment. And traditional treating way can not solve problems efficiently but cause waste and environmental pollution. After being studied for years. we developed the technique of subsidence of the oblique plate,rotary separation flowing in vacuum and depth filtration in grade. The 5th generation special vacuum oil purifier in Yuneng can fast damage emulsifying, remove water, air and impurities thoroughly, and also make the turbine oil clear, improve maintenance level of machine aggregates.