Deep cold ball valves are widely used in ethylene, liquefied natural gas industry in a variety of equipment and piping systems, but also can be used for other cryogenic liquid storage and transportation equipment and deep cold media, used to control the flow of liquid and flow direction. The working temperature can be -196℃. The driving mode is manual, worm gear transmission, pneumatic or electric, with flange or thread connection. If the deep cooling ball valve fails, it may lead to serious consequences such as leakage, fire or explosion. Deep cooling ball valve is one of the indispensable and important equipments in LNG industry, choosing high quality deep cooling ball valve with its safety and reliability is crucial to guarantee the safety of LNG production, transportation and use.