Three eccentric sealing pneumatic butterfly valve As for the pneumatic butterfly valve with three eccentric sealing structure, its sealing principle is also based on the double eccentric structure. At this time, the appearance of love between the valve seat and the centerline of the valve body reappears β The angle offset is slightly different from the above situation. When the sealing surface of the butterfly valve is opened, it will immediately leave the valve seat, while when it is closed, it will directly press the cover tightly. The butterfly valve with this type of structure has a big advantage, that is, it can completely clear the scratches between the two sealing surfaces, which can make the butterfly valve use longer. 　　

Use and maintenance of pneumatic ball valve
1. Scale: This manual is applicable to the electric (or pneumatic) ball valve at the flange joint end. 　　
2. Composition: It consists of an electric (or pneumatic) actuator (20) and a ball valve body, which is connected by a bracket (18) and a connecting shaft (17). 　　
3. The nameplate shows the maximum allowable operating pressure of the ball valve at the maximum and minimum operating temperatures. L For seats and seals made of PTFE or RTFE materials, the operating temperature should be between 150 ° C and 200 ° C. The operating temperature of other types of valve seats and seals shall be checked.