The plate heat exchanger is composed of a group of corrugated metal plates with holes on the plate,which the medium pass through the channelfor heat transfe.The plates with gaskets are mounted in a frame and clamped by clamping studs. Heat exchanger plate is installed at reverse 180 degrees to form a channel. The plate is equipped with a sealing gasket, which completely tails the liquid passage and guides the liquid flow to the channels of each body to prevent mixing of different media. The plate group is positioned, pressed by a fixed plate and a pressure plate, and clamped by a tightening bolts. In order to achieve better heat transfer effect, the hot and cold medium is usually designed as countercurrent in the heat exchanger.