ȤӮ羺APP

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Development and application of triple eccentric butterfly ȤӮ羺APP
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Development and application of triple eccentric butterfly ȤӮ羺APP
The design and manufacture of butterfly ȤӮ羺APPs are still greatly influenced by the limitations of the textbooks, the design and manufacture of ȤӮ羺APPs in many countries. At the same time, the advanced countries, Europe and the United States are vigorously promoting butterfly ȤӮ羺APPs.
The reason is very simple, butterfly ȤӮ羺APP is not what it used to be.
The excellent performance of butterfly ȤӮ羺APP is closely related to its continuous eccentricity, evolution and development. In order to meet the requirements of various working conditions, butterfly ȤӮ羺APP has experienced the evolution from concentric to single eccentric, double eccentric and triple eccentric. The evolution of butterfly ȤӮ羺APP and the development and application of 3 eccentric butterfly ȤӮ羺APP are briefly introduced as follows:
1 Classification of butterfly ȤӮ羺APPs
1. Concentric butterfly ȤӮ羺APP
The structure feature of the butterfly ȤӮ羺APP is that the shaft center of the ȤӮ羺APP rod, the center of the butterfly plate and the center of the body are in the same position. The structure is simple and the manufacture is convenient. The common rubber lined butterfly ȤӮ羺APP belongs to this type. The disadvantage is that the butterfly plate and ȤӮ羺APP seat are always in the state of extrusion and scraping, with large resistance distance and fast wear. In order to overcome extrusion, scratch and ensure sealing performance, the ȤӮ羺APP seat is basically made of elastic materials such as rubber or polytetrafluoroethylene, but it is also limited by temperature in use. This is why people traditionally think that butterfly ȤӮ羺APPs are not resistant to high temperature.
2. Single eccentric butterfly ȤӮ羺APP
In order to solve the problem of extrusion between butterfly plate and ȤӮ羺APP seat of concentric butterfly ȤӮ羺APP, a single eccentric butterfly ȤӮ羺APP is produced. Its structural feature is that the shaft center of ȤӮ羺APP rod deviates from the center of butterfly plate, so that the upper and lower ends of butterfly plate no longer become rotary axis, disperse and reduce the excessive extrusion between upper and lower ends of butterfly plate and ȤӮ羺APP seat. However, due to the single eccentric structure in the whole process of ȤӮ羺APP opening and closing, the scraping phenomenon between butterfly plate and ȤӮ羺APP seat has not disappeared, and the application range is similar to that of concentric butterfly ȤӮ羺APP, so it is not used much.
3. Double eccentric butterfly ȤӮ羺APP
On the basis of single eccentric butterfly ȤӮ羺APP, the most widely used double eccentric butterfly ȤӮ羺APP is further improved. The structure feature is that the shaft center of the ȤӮ羺APP rod deviates from the center of the butterfly plate and the center of the body. The effect of double eccentricity makes the butterfly plate break away from the ȤӮ羺APP seat immediately after the ȤӮ羺APP is opened, which greatly eliminates the unnecessary excessive extrusion and scratch between the butterfly plate and the ȤӮ羺APP seat, reduces the opening resistance, reduces the wear and improves the service life of the ȤӮ羺APP seat. The large reduction of scraping, at the same time, the double eccentric butterfly ȤӮ羺APP can also use metal seat, which improves the application of butterfly ȤӮ羺APP in the field of high temperature. However, because the sealing principle belongs to position sealing structure, that is, the sealing surface of butterfly plate and ȤӮ羺APP seat is in line contact, and the elastic deformation caused by squeezing the ȤӮ羺APP seat through butterfly plate produces sealing effect. Therefore, the requirements for closing position are very high (especially for metal ȤӮ羺APP seat), and the pressure bearing capacity is low. This is why people traditionally think that butterfly ȤӮ羺APP is not resistant to high pressure and has large leakage.
Three eccentric butterfly ȤӮ羺APPs
To withstand high temperature, hard seal must be used, but the leakage is large; to zero leakage, soft seal must be used, but not resistant to high temperature. In order to overcome the contradiction of double eccentric butterfly ȤӮ羺APP, the third eccentricity of butterfly ȤӮ羺APP was carried out. The structural features of the structure are that the conical axis of the butterfly plate sealing surface is inclined to the cylinder axis of the body while the shaft center of the double eccentric ȤӮ羺APP rod is eccentric. That is to say, after the third eccentricity, the sealing section of the butterfly plate is no longer true circle, but ellipse, and the shape of its sealing surface is asymmetric, one side is inclined to the body center line, and the other side is parallel to the body center line.
??? The biggest feature of this third eccentricity is that it fundamentally changes the sealing structure. It is no longer a position seal, but a torque seal. That is to say, it does not rely on the elastic deformation of the ȤӮ羺APP seat, but completely depends on the contact surface pressure of the ȤӮ羺APP seat to achieve the sealing effect. Therefore, the problem of zero leakage of the metal ȤӮ羺APP seat is solved at one stroke. Because the contact surface pressure is proportional to the medium pressure, it is also resistant to high pressure and high temperature It's the edge.
Development of two and three eccentric butterfly ȤӮ羺APPs
Since the advent of the three eccentric disc ȤӮ羺APP, in order to meet the increasingly stringent requirements of working conditions, it has also experienced the process of self-improvement and continuous development. Even if the most basic zero leakage and three eccentric disc ȤӮ羺APP can be achieved in theory, it still depends on careful design and precise manufacturing.

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