Due to the restriction of valve sealing structure and its corresponding sealing materials, the operating temperature is less than 200 ℃. In addition, the service life is shorter when it is used at 200 ℃ for a long time. Although high-strength graphite material with a short-term resistance of 300 ℃ can be selected for the valve seat, many parts of the valve that need to be sealed still cannot be sealed at high temperature, especially for radial seal, high-strength graphite material is not suitable for radial seal. Generally, the radial seal of insulated pneumatic ball valve adopts O-ring sealing structure, so the service temperature of the whole valve is directly restricted by the service temperature of O-ring. At present, the O-ring used on insulated pneumatic ball valve is fluororubber, but the service temperature of fluororubber is within 200 ℃, and it cannot be used in this extreme temperature for a long time.

V-type regulating ball valve is composed of pneumatic actuator and V-type ball valve, and the valve core is ceramic. The V-shaped opening ball has a shearing effect with the valve seat. When the medium contains fibers or solid particles, the V-shaped ball will not be stuck, and good sealing is still ensured. The valve core is made of ceramic, which has high abrasion resistance. The valve seat protection ring can prevent the fluid from directly washing the valve seat, and extend the service life of the valve seat.