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Characteristics of liquid nitrogen vacuum thermostat tube: very low loss rate of liquid nitrogen; inside and outside of the tube are stainless steel materials, good strength; male and female joint connection, heat leakage is small; light sandwich materials and adsorbent use, interlayer vacuum long life the new generation of liquid nitrogen vacuum adiabatic tube on the basis of the original size has been reduced, the use of clamp locking way to connect, convenient and easy to operate. The liquid nitrogen vacuum thermostat tube has no fixed size and is more suitable for production line and environment. It can be used for long-distance and short-distance low-temperature medium transportation. The pipe is of natural metal color and has a beautiful appearance, can be widely used in aerospace, machinery manufacturing, food processing, bio-medical, animal husbandry, scientific research units and other industries of ultra-low temperature medium (liquid nitrogen, liquid argon, liquid oxygen, LNG) transport. The vacuum tube was heated-heated rough pumping-heated high vacuum pumping-cold high vacuum pumping-sealing according to the relevant regulations. Adopt automatic high vacuum oil diffusion pump equipment.