In butterfly valves, we often hear monoeccentric butterfly valves, double eccentric butterfly valves, Triple Eccentric Butterfly Valveerfly valves and other words, so what is the difference between Triple Eccentric Butterfly Valvelves? Apart from professionals, it is difficult for us to have a clear understanding of Triple Eccentric Butterfly Valvelves. Don't worry, today Xiaobian will come to talk with you about the characteristics of Triple Eccentric Butterfly Valvelves.
Single eccentric butterfly valve

In order to solve the problem of extrusion between butterfly plate and seat of concentric butterfly valve, a single eccentric butterfly valve is produced. Its structural feature is that the axis of the stem deviates from the center of the butterfly plate, so that the upper and lower ends of the butterfly plate can no longer become the center of rotation, disperse and reduce the excessive extrusion between the upper and lower ends of the butterfly plate and the seat. However, due to the single eccentricity structure in the whole process of the valve switch butterfly plate and seat scratch phenomenon has not disappeared, in the application scope and concentric butterfly valve are similar, so the use is not much.

Two, double eccentric butterfly valve
On the basis of single eccentric butterfly valve, the further improvement is the widely used double eccentric butterfly valve. Its structural characteristics are that the axis of the stem deviates from the center of the butterfly plate and also deviates from the center of the body. The effect of double eccentricity enables the butterfly plate to detach from the valve seat immediately after the valve is opened, greatly eliminating unnecessary over-extrusion and scratch between the butterfly plate and the valve seat, reducing the opening resistance, reducing wear and tear, and improving the service life of the valve seat. The scratch is greatly reduced. At the same time, the double eccentric butterfly valve can also use metal seat, which improves the application of butterfly valve in high temperature field. But because its sealing principle belongs to position sealing structure, that is, the sealing surface of butterfly plate and seat is in line contact, and the elastic deformation caused by butterfly plate extruding the seat produces sealing effect, it requires high closing position (especially metal seat) and low pressure bearing capacity, which is why butterfly valve is traditionally considered not to withstand high pressure. The reasons for the large leakage.
Three, Triple Eccentric Butterfly Valvetterfly valves
To withstand high temperature, hard seals must be used, but the leakage is large; to zero leakage, soft seals must be used, but not high temperature. In order to overcome the contradiction between double eccentric butterfly valve and butterfly valve, it has made third eccentricities. Its structural characteristics are that the conical axis of the butterfly plate sealing surface is deflected to the cylinder axis of the body while the axis of the double eccentric stem is eccentric, that is to say, after the third eccentric, the sealing section of the butterfly plate is no longer a true circle, but an ellipse, and the shape of the sealing surface is asymmetric, and one side is inclined to the body. The heart line and the other side are parallel to the center line of the body.
This third eccentricity is characterized by radically changing the sealing structure, not position seal, but torsional seal, i.e. not relying on the elastic deformation of the seat, but relying entirely on the contact surface pressure of the seat to achieve the sealing effect. Therefore, the problem of zero leakage of the metal seat is solved at one stroke, and due to the contact surface pressure and medium. The mass pressure is directly proportional to the high pressure and high temperature.
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Read this article, do you have some deeper understanding of Triple Eccentric Butterfly Valvelves? You can contact us if you have any requirements or technical communication consultation for three eccentric butterfly valves or valve related products.