D642F aeroelastic metal sealing butterfly valve with a "U" shaped stainless steel ring, the precise elastic sealing ring and a polished disc 3D eccentric contacts. Traditional eccentric butterfly valve to open and close the ills from 0 ° to 10 ° instantaneous sealing surface is still in sliding contact friction disc sealing surface in the opening moments, separation, close contact that the sealing effect, to prolong the service life of sealing performance the best purpose. Which is widely applied to the medium temperature ≤ 550 ° C, metallurgy, electric power, petroleum, chemical, air, gas, combustible gas and water supply and drainage, corrosive media channels, the best device to regulate flow and truncated fluid.
Feature
1, the butterfly valve structure is simple, compact, light weight, easy installation and removal, easy maintenance;
2, the butterfly valve of stainless steel "U" type seals, with a certain degree of flexibility in terms of heat, cold case and disc has a good seal;
3, the three-dimensional eccentric butterfly valve from the rigorous calculation of the "U"-ring and the disc is almost no friction, long life, and has a more closed more tight functions; 
4, disc sealing surface using the surfacing cobalt carbide, sealing surface wear resistance, long service life; 5, the structure of the butterfly valve is a unique "switch" just turn the valve stem 90 ° to complete. Flexible, convenient, and effort, not the level of impact of the media pressure, sealing performance and reliable; 6, high temperature, low temperature resistance, corrosion resistance.