2. Multilayer sealing structure Multilayer sealing structure adopts soft and hard multi stack metal ring to fix the multi stack seal ring on the butterfly plate so that it does not bend and move, and effectively avoids the direct scouring of the media on the laminated seal ring. The sealing surface of the valve seat is welded with hard alloy electrode with excellent wear resistance, thus improving the service life of the butterfly valve. It has the double advantages of metal hard seal and elastic seal, and has excellent sealing performance no matter at high or low temperature. With the 3D eccentric structure design, there is almost no friction between the valve seat and the butterfly plate, and it has the sealing function of tightening as it closes. Plate structure

Differences between V-type regulating ball valve and pneumatic butterfly valve:
(1) Small size, small mass, easy to install, its mass is only 1/3~1/4 of that of the gate valve at the same level, and its height and width are only 1/3 of that of the gate valve at the same level;
(2) The cutting performance is better than that of gate valve and globe valve;
(3) Good regulation performance, not only low pressure drop, but also wide regulation range;
(4) Simple structure and easy maintenance;. Easy to configure automatic control actuator;
(5) Compared with gate valves and globe valves of the same temperature and pressure rating, butterfly valves are cheap.