The core is produced by adopting high frequency composite welded tube and nitrogen protection brazing technology，resisting the corrosion and scale formation. The tank,filler、inlet & outlet and relevant components are argon arc welded. Resistance to high pressure flushing and with high reliability. It is equipped with dustproof devices,with high efficiency for heat exchange，with compact space，so that it can adapt to various kinds of condition. The product can be applicable to mechanical and hydraulic equipment of 1.5T-42T.