The heat preservation jacket ball valve has good heat preservation and cooling characteristics, and the diameter of the valve is the same as the diameter of the pipe. At the same time, it can effectively reduce the heat loss of medium in the pipeline. Mainly used in petroleum, chemical industry, metallurgy, pharmacy, food and other systems to transport high viscosity media that will solidify at room temperature. Scope of application: urban construction, chemical industry, metallurgy, petroleum, pharmaceutical, food, beverage, environmental protection.