Low-temperature liquid pump low-temperature pump low-temperature pump low-temperature pump 2 petroleum, air separation and chemical plant 3 liquid oxygen, liquid nitrogen, liquid argon its purpose is to transfer low-temperature liquid from places with low pressure to places with high pressure. With the development of air separation technology, cryogenic liquids have been widely used and developed. Its function in an air separation unit is to circulate liquids or to Extract Liquids from a tank and press them into a carburetor, where they are vaporized and sent to the user. Since the medium conveyed by the cryogenic liquid pump is all cryogenic liquid, it should be kept low temperature in the course of conveying the medium. If more heat is absorbed from around the pump, the cryogenic liquid in the pump will vaporize in large quantities and produce gas, which affects the pump's performance. Therefore, cryogenic pump in the structure, materials, installation and operation of its special requirements in order to meet the requirements of cryogenic liquid transportation. According to the different working principles, cryogenic pumps are mainly divided into reciprocating and centrifugal two categories.