3 Analysis of main sealing structure of pneumatic ball valve Early pneumatic ball valves generally use metal materials as the sealing structure (also known as hard sealing). With the development of engineering plastics technology, especially the emergence of polytetrafluoroethylene, the sealing structure of pneumatic ball valves has a more ideal sealing material. The common soft seal forms of the main seal structure of pneumatic ball valve include rigid seal seat, seal seat with elastic elements, PTFE lip seal seat and combined seal seat composed of elastic expansion ring and PTFE lip seal seat. The lip type seal seat has a lip shaped structure, which makes it more elastic. In use, it can ensure the pre compression of the sealing surface and compensate the pre compression of the sealing surface, which is superior to the rigid structure.

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