CT-RDB series pneumatic switch disc valve is composed of two parts: double piston drive gear rack type angular stroke pneumatic actuator and switch disc valve body assembly. The conical axis of the sealing surface of the valve plate is tilted to the center of the valve channel on the premise of retaining the deviation between the rotating center of the valve plate and the section of the sealing surface of the valve plate and the center of the valve channel. The unique design makes this series of butterfly valves not only withstand the harsh conditions of high temperature and pressure, but also have excellent sealing performance, compact structure, superior cutting and adjusting performance, and long service life. It can be widely used in chemical, electric power, metallurgy, textile, food, medicine, paper and other industrial sectors and municipal engineering, water plants and other process control fields, to reliably adjust or cut off the fluid media of various gases, liquids, slurry, solid powder and so on.