The structural design features and installation requirements of the ultra-low temperature pneumatic ball valve are applicable to the valve working in the cryogenic cryogenic working condition, which is called the cryogenic valve. In the valve industry, all valves below - 40 ℃ are called cryogenic valves. Ultra cryogenic valves below - 101 ℃ are generally used in cryogenic systems such as liquid helium, liquid hydrogen, liquefied natural gas and air separation. The medium used is liquid helium, liquid hydrogen, liquefied natural gas, liquid nitrogen, liquid oxygen and other cryogenic fluids. Low temperature stop valves are commonly used in low temperature environments. In some special environments, cryogenic pneumatic ball valves, cryogenic gate valves and cryogenic butterfly valves are also used. Under low temperature conditions, the conventional metal hard seal and non-metallic soft seal cannot meet the sealing requirements. In order to ensure the safe and reliable operation of cryogenic valves at low temperature, the structural design features and installation requirements of ultra-low temperature pneumatic ball valves.

Compensator, device and convenient transportation
The main body of non-metallic contraction joint adopts non-metallic materials, which greatly reduces the product weight, thus reducing the difficulty of device and transportation.
2. No hard force transmission
Non metallic shrink joint products are made of flexible materials, thus eliminating hard force transmission, optimizing the design of pipeline system, and extending the service life of pipeline equipment.
3. High resistance, temperature resistance, combustion and corrosion resistance
The non-metallic shrink joint is made of inorganic materials, so it has high temperature resistance and flame retardancy. And according to the different working media, we can select the corresponding data structure to deal with the corrosion problem.
4. Compensation device error
Systematic error is inevitable in the process of pipeline design, processing and installation. Non metal shrinkage can effectively eliminate these errors.
5. Good cost performance
The price of non-metallic shrink joints is far lower than that of metal bellows, and it is also 1/4~1/5 of the price of imported shrink joints.
6. Compensated thermal shrinkage
The pipeline system will have multi-directional deviation with the rapid change of temperature during operation. Non metallic shrinkage energy saving provides all-round compensation in a small space.