(3) Because the stainless steel seal ring is used on the ball valve, the elasticity problem will not be worried. It has the same characteristics as the butterfly plate in both high temperature and low temperature service environments, which is often referred to as sealing. 　　　　

What are the characteristics of pneumatic butterfly valve? 　　
1. It is compact and light, easy to disassemble and repair, and can be installed at any position. 　　
2. The pneumatic butterfly valve has simple and compact structure, small operating torque, and quick 90 ° reverse opening. 　　
3. The flow characteristics tend to be straight, and the regulation performance is good. What are the characteristics of pneumatic butterfly valve? 　　
4. The connection between the butterfly plate and the valve stem adopts a pin free structure, which overcomes the possible internal leakage point. 　　
5. The outer circle of the butterfly plate adopts spherical shape, which improves the sealing performance and prolongs the service life of the valve. It still insists on zero leakage after 50000 times of opening and closing under pressure. 　　
6. The sealing elements can be replaced, and the sealing is firm to achieve two-way sealing. What are the characteristics of pneumatic butterfly valve? 　　
7. The butterfly plate can be coated according to user requirements, such as nylon or PTFE. 　　
8. Pneumatic butterfly valve can be designed as flange connection and wafer connection. 　　
9. The driving method can be manual, electric or pneumatic.