Fuente: WIPO "dairy products" The invention belongs to the technical field of production equipment of dairy products and especially relates to a flash sterilizing unit for dairy products and a method. The flash sterilizing unit comprises a first sterilizing pipe, a second sterilizing pipe, a flash separating tank, a condenser, a water tank and a steam pipe, wherein the top of the first sterilizing pipe is connected with the top of the second sterilizing pipe; the bottom of the second sterilizing pipe is connected with the flash separating tank; a discharging pump is connected with the bottom of the flash separating tank; the steam pipe has two braches which are respectively connected with the first sterilizing pipe and the second sterilizing pipe; a vacuum pump is connected with the top of the condenser; and the middle part of the condenser is connected with the top of the flash separating tank. The invention utilizes a steam instant vaporizing direct injection type sterilizing method, so that the material heating time is short, the temperature rise is quick and the steam is instantly vaporized for sterilizing; the nutritional ingredients of the material are kept unchanged; and after the sterilized material is flashed, separated, degassed, condensed and evaporated, the odor is removed, most water also evaporates, and the purposes of sterilizing, tempering and degassing are achieved. The flash sterilizing unit is an ideal device for continuous and automatic production of large-size bean flour factories.