Sealing Principles of Butterfly Valve

The sealing design of the arrangement of butterfly valves created are: single eccentric seal, double eccentric seal, triple eccentric seal, variable eccentric seal, and the sealing standards of different underlying sorts of butterfly valves are momentarily portrayed as follows:

1. The sealing guideline of the single eccentric sealing butterfly valve

Since the focal point of turn of the butterfly plate (that is, the focal point of the valve shaft) is counterbalanced from the middle line of the valve body based on the single eccentric butterfly valve, the sealing surface of the butterfly plate will be quicker than the single eccentric sealing butterfly valve during the initial interaction. At the point when the valve seat is isolated from the sealing surface and the butterfly plate pivots to 8°~12°, the butterfly plate sealing surface is isolated from the seat seal. At the point when completely opened, a bigger hole is framed between the two sealing surfaces. The plan of this sort of butterfly valve incredibly The mechanical wear and expulsion deformity between the two sealing surfaces is decreased, and the sealing execution of the butterfly valve is improved.

Butterfly Valve

2. The sealing rule of the double eccentric sealing butterfly valve

Since the middle line of the valve seat and the middle line of the valve body structure, a β point balance based on the double eccentric butterfly valve, the sealing surface of the butterfly plate quickly leaves the sealing surface of the valve seat right now of opening during the valve opening interaction. Just right now of shutting does it contact and pack the seat sealing surface. At the point when completely opened, a hole same as the double eccentric sealing butterfly valve is shaped between the two sealing surfaces. The plan of this kind of butterfly valve wipes out the mechanically scraped spot and scraped area between the two sealing surfaces, with the goal that the sealing execution and administration life of the butterfly valve are improved. Have been extraordinarily improved.

3. The sealing standard of the variable eccentric sealing butterfly valve

The uniqueness of the variable eccentric butterfly valve is that the valve stem shaft where the butterfly plate is introduced is a three-portion shaft structure. The three-portion shaft type valve stem has two shaft segments concentric, and the middle line of the focal shaft is veered off from the two finishes of the pivot by a middle distance, The butterfly plate is introduced on the transitional shaft area. A particularly eccentric design makes the butterfly plate a double eccentric shape when in the completely vacant position, and a single eccentric shape when the butterfly plate pivots to the shut position. Because of the impact of the eccentric shaft, when it is near shutting, the butterfly plate moves a distance into the sealing cone surface of the valve seat, and the butterfly plate coordinates with the sealing surface of the valve seat to accomplish dependable sealing execution.

Since the turn focal point of the butterfly plate (that is, the focal point of the valve shaft) and the sealing part of the butterfly plate is set eccentrically, the butterfly plate sealing surface progressively isolates from the valve seat sealing surface during the initial cycle of the butterfly valve. At the point when the butterfly plate pivots to 20°~25°, The sealing surface of the butterfly plate is isolated from the sealing surface of the valve seat. At the point when completely opened, a hole is shaped between the two sealing surfaces, with the goal that the general mechanical wear and expulsion between the two sealing surfaces of the butterfly valve are enormously diminished during the opening and shutting measure, consequently guaranteeing to seal of butterfly valves.