The advantages and disadvantages of triple eccentric butterfly valve expound that butterfly valve has been widely used in chemical, metallurgy, petroleum and other industries. Of course, the majority of soft - seal butterfly valves. But in recent years, at some high temperatures; In the field of high pressure and strong corrosion, trieccentricity metal hard seal butterfly valve is widely used. Three-eccentric metal hard seal butterfly valve structure is characterized by the valve body and seat are connected components, seat seal surface layer surfacing welding temperature, corrosion resistant alloy materials. Multilayer soft fold type sealing ring is fixed on the valve plate, the butterfly valve and the traditional butterfly valve compared with high temperature resistant, convenient operation, opening and closing without friction, closing increase with the torque transmission mechanism to compensate for sealing, improve the butterfly valve sealing performance.

The advantages and disadvantages of triple eccentric butterfly valve expound that butterfly valve has been widely used in chemical, metallurgy, petroleum and other industries. Of course, the majority of soft - seal butterfly valves. But in recent years, at some high temperatures; In the field of high pressure and strong corrosion, trieccentricity metal hard seal butterfly valve is widely used. Three-eccentric metal hard seal butterfly valve structure is characterized by the valve body and seat are connected components, seat seal surface layer surfacing welding temperature, corrosion resistant alloy materials. Multilayer soft fold type sealing ring is fixed on the valve plate, the butterfly valve and the traditional butterfly valve compared with high temperature resistant, convenient operation, opening and closing without friction, closed as the actuator torque increases to compensate for sealing, improve the butterfly valve sealing performance and prolong the service life of the advantages. Of course, this kind of three-eccentric metal sealing butterfly valve also has its inherent disadvantages: 1. 2. Normally open the pipeline, and the sealing surface of the valve seat is washed on the front, which affects the multi-layer hard stacked sealing ring fixed on the valve plate, and will affect the sealing performance for a long time. 3. The principle of triple eccentric butterfly valve. The sealing between the sealing cover of the valve plate and the seat depends on the torque of the transmission device to push the valve plate towards the seat. In a positive flow state, the higher the medium pressure, the tighter the sealing extrusion. The seal begins to leak when the unit positive pressure between the disc and the seat is less than the medium pressure as the channel media countercurrent. There is now a new type of trieccentricity butterfly valve which is characterized by: the seat sealing ring is composed of two layers of stainless steel plates on both sides of the soft t-shaped sealing ring. The sealing surface of the valve plate and seat is a bevel cone structure, and the surface of the bevel cone of the valve plate is surmounted with heat-resistant and corrosion-resistant alloy materials. A structure in which a spring is fixed between a regulating ring platen and a adjusting bolt is assembled on the platen. This structure can effectively compensate the tolerance zone between sleeve and body and the elastic deformation of the stem under medium pressure, solve the valves in the process of the two-way exchange medium conveying the sealing problems. Soft T on both sides of the multi-layer stainless steel pieces of sealing ring, with metal sealing and soft sealing the dual advantages of under low temperature and high temperature circumstances, all with zero leakage sealing performance. With the development of mechanical technology, the use space of butterfly valve is more and more extensive, and many disadvantages have been improved.