High temperature resistance, hard sealing must be used, but the leakage is large; To achieve zero leakage, soft sealing must be used, but it is not resistant to high temperature. In order to overcome the contradiction of double eccentric butterfly valve, the butterfly valve was eccentric for the third time. The structural feature is that the conical axis of the sealing surface of the butterfly plate is inclined to the cylinder axis of the body while the position of the double eccentric valve stem axis is eccentric, that is, after the third eccentric, the sealing section of the butterfly plate is no longer true circle, but ellipse, and the shape of its sealing surface is also asymmetric, one side is inclined to the center line of the body, and the other side is parallel to the center line of the body. The biggest feature of this third eccentricity is that it has fundamentally changed the sealing structure. It is no longer a position seal, but a torque seal, that is, it does not rely on the elastic deformation of the valve seat, but completely relies on the contact surface pressure of the valve seat to achieve the sealing effect. Therefore, it has solved the problem of zero leakage of metal valve seats at one stroke, and because the contact surface pressure is proportional to the medium pressure High pressure and high temperature resistance can be easily solved.

People who have been exposed to industry know that valves are very important in the automation industry, and electric control valves belong to one kind of industrial valves. It receives signals from the industrial automation control system to drive the valve to change the cross-sectional area between the valve core and the valve seat to control the flow, temperature, pressure and other process parameters of the pipeline medium, so as to realize the automatic adjustment function. It is the crystallization of automation industrial technology. Nowadays, electric control valves have been widely used in many enterprises, and more and more people have realized the advantages and importance of electric control valves. The development prospect of electric control valves can be said to be great.