Transformer Oil Regeneration Machine Insulation Oil Purifier Transformer Oil Purification 1. Description of transformer insulation oil purifier VFD Series of signal and double stage high-efficient vacuum oil purifier is to remove free and dissolved water, gases, and mechanical impurities from insulating oils so as to ensure its purity and improve its insulation property. It is suitable for the ... Sino-NSH Oil Purifier Manufacture Co., Ltd