used transformer oil purifier is special for treating the used and old transformer oil, mutual oil, switch oil. Comparing with the single-stage type, this machine adopts the double stages vacuum system, which can improve the machine's working vacuum value highly, so it can dewater, degas and remove the impurity more deeply and effectively. The dielectric value of treated oil is higher than 65KV. It is very suitable for the large electric&insulation equipments.