THY-310B diesel oil purifier series are developed by our tianhou group, which is mainly applied to large diesel generating units or other equipments powered by diesel fuel engine of medium power below 4000HP. This new invention is used for filtering harmful impurities for diesel engine; thereby attain the aim of saving oil and protecting diesel engine. In China, the product has been applied to multiple companies running oil field large equipment, truck, and fishery harbors diesel engine. ect, and gained surprising achievements and praise from clients.