This oil purifier is through special internal settings,XL-D series multifunction filter can separately deal with hydraulic oil,turbine oil and transformer oil,effectively removing impurities,moisture,gas,free carbon,and other harmful substances in oil can also be used for drainage of old oil and injection of new oil,and able to dry up the damp transformer and other purposes.The device can be long-term on-line with the operating system,providing high-precision purification for oil regeneration.