The temperature pointer of the pneumatic butterfly valve is made of the sealing ring material. If the temperature is less than or equal to 80 degrees, the rubber sealing material should be used. The rubber sealing material can be divided into three types, namely, ethylene propylene rubber material, which is mainly used to combat aging; Nitrile rubber material can resist the invasion of oil substances; Abrasion resistant rubber material.

The ball and valve seat seal ring are made of metal materials, and the sealing pressure is very high. The pressure relying on the medium itself cannot meet the sealing requirements, so it is necessary to apply external force. This valve is suitable for high temperature and high pressure media. An elastic sphere obtains elasticity by opening an elastic groove at the lower end of the inner wall of the sphere. When closing the channel, use the wedge head of the valve rod to expand the ball and compress the valve seat to seal. Loosen the wedge head before rotating the ball, and then the ball will return to its original shape, so that there is a small gap between the ball and the valve seat, which can reduce the friction and operating torque of the sealing surface.