Plate heat exchanger consists of a pack of corrugated metal sheet structure, a metal plate with a hole between the two streams through these holes occur. Board assembly is installed between a frame plate and a pressure plate, tighten the bolts with pressed. Plate with sealing gasket for sealing a fluid passageway and into the guide channel alternately. Number of plates is determined by the physical properties of the fluid flow rate, pressure drop and temperature program. Board of folds promote fluid turbulence, and pressure plates play a supporting role. For the pharmaceutical and other liquid food products, in-situ cleaning liquid and water cooling and heating. As well as some applications of pasteurization. Specifications: 0.5m2-200m2