Triple eccentric butterfly valve ductile iron

Standards:

 Comply With  ISO 5752/BS5155/BS EN593 

Material:

Features:

To be resistant to high temperatures, hard seals must be used, but leakage is large; to have zero leakage, soft seals must be used and are resistant to high temperatures. In order to overcome the contradiction of the double eccentric butterfly valve, the butterfly valve was eccentric for the third time. Its structural feature is that while the double-eccentric valve stem axis position is eccentric, the conical shape of the sealing surface of the butterfly plate is deflected from the cone of the body. Secondly, after the secondary eccentricity, the sealing section of the third butterfly plate is no longer a true circle. , instead of an ellipse, the shape of the sealing surface is therefore not biased toward the center line of the body on one end, and parallel to the center line of the body on the other side. The biggest reason for this third eccentricity is that the sealing structure is fundamentally changed. It is no longer a position seal, but a torsion 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, the problem of zero leakage of the metal valve seat is solved, and because the contact surface pressure is proportional to the medium pressure, the high pressure and high temperature resistance is also easily solved.

Triple eccentric butterfly valves are suitable for high and low temperatures and various corrosive media such as acids and alkalis. Especially in large diameters, they have the advantage of zero emissions. In shut-off valves, they are constantly replacing large gate valves and ball valves. Similarly, maintenance It has good regulating function and is constantly replacing bulky regulating valves in regulating valves.