Product introduction for butterfly valve
Butterfly valves are widely used in urban construction, petrochemical, metallurgical, power and other industries on the medium pipe to cut or adjust the flow of the best device. Butterfly valve structure itself is the ideal opening and closing parts in the pipeline, is the development direction of pipe opening and closing parts.
The first is a soft sealing butterfly valve single eccentric structure, the valve seat sealing section or the disc thickness direction and the bisector of the stem rotation center relative eccentricity, making the valve in the opening process, the disc sealing surface gradually from the valve seat sealing surface. The butterfly plate rotation to 20~25 degrees, the disc sealing surface completely from the valve seat sealing surface, so that the valve in the opening process, between the two sealing surface relative mechanical wear and extrusion is greatly reduced, so that the valve sealing performance can be improved. This design mainly relies on the compression between the butterfly plate and the valve seat to produce elastic deformation to ensure the seal of the butterfly valve.
Based on the single eccentric butterfly valve, the rotation center of the butterfly plate and the center line of the valve flow relative bias, making the valve in the opening process, the formation of cam effect, so that the sealing surface of the butterfly plate than the single eccentric structure more quickly from the seat sealing surface. When the disc rotates to 8 degrees ~12 degrees, the butterfly plate sealing surface is completely separated from the seat sealing surface. The design of the structure greatly reduces the relative mechanical wear and extrusion deformation between the two sealing surfaces, so that the sealing performance of the butterfly valve is improved.
On the basis of double eccentric butterfly valve, the valve seat sealing surface of the center line and the center line of valve to form an eccentric angle, the butterfly plate in the process of opening, the sealing surface of the disc immediately from the seat sealing surface in the opening moments, and in the closing moments will contact and compress the valve seat sealing surface. This unique eccentric combination takes full advantage of the cam effect, completely eliminates mechanical friction and galling between the two sealing surfaces of the butterfly valve seal when the valve opens and closes, and eliminates the possibility of wear and leakage. The extrusion sealing is a torque seal, and the sealing ratio pressure is adjusted by adjusting the external driving moment so as to greatly improve the sealing performance and service life of the three eccentric structure sealing butterfly valve