Structure and characteristic£º This series uses the tetrafluoroethylene to seal also to install the pressure spring to make the compensation system. Drills the flow channel on the graphite stack which has is interlinked, also between these two groups has the right angle, two kind of different fluids achieve the heat change through these two groups of flow channels the goal. This series uses the advanced processing craft, has the heat transfer efficiency is reliable, does impact and overhaul convenience merit and so on high, stable. The biggest heat transfer area may amount to 800 square meters.