The vulcanizer insulation jacket is located in an important heat-generating part, but the insulation of the vulcanization valve often becomes a weak link in insulation. When disassembling and assembling the valve, the insulation material installed on the valve often becomes a difficulty in valve maintenance. For example, it is necessary to redo the insulation, or the harmful fiber irritation to the human body is generated when removing or installing the insulation material, etc. The detachable valve insulation jacket we developed can completely avoid the above situations. It is not only easy to install or disassemble, but also can be reused with low cost. The valve jacket is made of lightweight asbestos-free material and can also be used in narrow areas. The detachable valve insulation jacket can be installed on ball valves, gate valves and butterfly valves. Usually, users can order the corresponding valve insulation jacket by providing the valve name and DN size, and detailed specifications are required for special valve insulation jackets.