Widely used in various industries pneumatic butterfly valve sealing performance, running light, and vice corrosion, high temperature, and easy to operate, flexible, safe and reliable use of pneumatic butterfly valve seal structure: a single eccentric seal, double eccentric seal, three eccentric seal, variable eccentric seal, various sealing structure of the pneumatic butterfly valve seal principle summarized as follows:

A single eccentric sealing butterfly valve seal principle metal hard seal butterfly valve: the formation of size bias due to the rotation center (both valve shaft center) on the basis of a single eccentric butterfly valve disc and valve centerline, making the butterfly valve in the open process, the sealing surface of the disc than a single eccentric sealing butterfly valve from the valve seat sealing surface, the disc rotation to 8 ° to 12 °, the sealing surface of the disc had completely divorced from the valve seat sealing, fully pneumatic soft when the sealing butterfly valve is open, the formation of a larger gap between the two sealing surfaces, such butterfly valve design, which greatly reduces the sealing surface between the mechanical wear and deformation of the crowded pressure, so that the butterfly valve sealing performance and enhancing ;

Two double eccentric sealing butterfly valve seal principle: Due to the centerline on the basis of the double eccentric butterfly valve seat and valve centerline of the formation of a pneumatic hard sealing butterfly valve angle β bias, making the butterfly valve in the the Kai valve process , the sealing surface of the disc immediately in the opening moments from the seat sealing surface, turn off the instant before contact and compress the valve seat sealing surface. When fully open, the sealing surface between the formation of sealing a double eccentric butterfly valve the same gap type of butterfly valve design, the complete elimination of mechanical wear and abrasion of the sealing surface between the stainless steel pneumatic butterfly valve to make butterfly The valve sealing performance and service life have been greatly improved;

Variable eccentric seal butterfly valve seal principle: variable eccentric butterfly valve is unique in that the stem axis installation disc is a three-axis structure, the three-axis valve electric rubber lined butterfly valve lever two-axis segment concentric, while the center section shaft centerline and both ends of the axis deviated from a center distance, the disc is mounted on the intermediate shaft section. This eccentric structure makes the disc double eccentric-shaped, in the fully open position to the closed position when a single eccentric like the disc rotation. The role of the eccentric shaft, near the closed disc to the valve seat sealing cone moved a distance, butterfly plate and valve seat seal sealing face consistent to achieve a reliable seal performance;

4 high-performance three-eccentric hard sealing butterfly valve, characterized in that: said valve seat ring by the soft T-shaped sealing ring on both sides of multi-layer stainless steel sheet. Structure of the valve plate and valve seat sealing surface of the oblique cone pneumatic hard seal butterfly valves wafer adjust the ring plate and the spring between the platen adjustment bolt welding temperature of the surface of the valve plate oblique cone, corrosion resistant alloy material; assembly structure.

Pneumatic butterfly valve due to the sealing structure application in different areas, there will still be different in the choice of pneumatic butterfly valve, it should be based on actual use, select the appropriate seal forms.