The pasteurizer consists of plate heat exchanger, balance tank, pump, hot water circulation system (including: mixer of steam and water or steam-water plate heat exchanger, hot water pump, steam adjusting valve and water level control, etc) Temperature control, this is used in heating and cooling raw material. The pasteurizer is usually used in the processes of milk, ice-cream, milk powder, fruit juice, beverage, etc which is sensitive to heat. The material is pumped to the plate heat exchanger, then been preheating, holding, heat energy recover, cooling and all this can keep the products original physical nature and taste. If the temperature is below the set temperature, it can be sensed by the temperature transmitter. A signal activates flow diversion valve and the material flows back to the balance tank, then the material is pasteurized again.