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difference between high performance butterfly valves

  • 2021-04-29 13:44

Single eccentric butterfly valve: In order to solve the problem of squeezing between the butterfly plate and the valve seat of the concentric butterfly valve, the single eccentric butterfly valve is produced. Its structural feature is that the shaft center of the valve stem deviates from the center of the butterfly plate, so that the upper and lower ends of the butterfly plate no longer become The rotation axis is dispersed, and the excessive extrusion between the upper and lower ends of the butterfly plate and the valve seat is reduced.

Double eccentric butterfly valve: On the basis of the single eccentric butterfly valve, the double eccentric butterfly valve is the most widely used double eccentric butterfly valve. Its structural feature is that the axis of the valve stem deviates from the center of the butterfly plate and the center of the body. The double eccentric effect enables the butterfly plate to be released from the valve seat immediately after the valve is opened, which greatly eliminates unnecessary excessive extrusion and scratching of the butterfly plate and the valve seat, reduces the opening resistance, reduces wear and improves The life of the valve seat is improved.
Triple eccentric butterfly valve: To withstand high temperatures, hard seals must be used, but the leakage is large; for zero leakage, soft seals must be used, but they are not 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. The so-called third eccentricity means that the shape of the sealing pair is not a positive cone, but an oblique cone.

 
The high-performance butterfly valve is a new type of butterfly valve designed on the basis of absorbing the advantages of several different structure butterfly valves. The sealing surface of the valve plate of this butterfly valve is a spherical arc surface body, and the sealing mechanism achieves a real dynamic seal through the system pressure, so it has excellent cutting performance and durability. Its small size, light weight, wide manufacturing range and easy maintenance.
The triple eccentric butterfly valve has the following advantages:
 
1) Good sealing performance improves the reliability of the system;
2) Small friction resistance, labor-saving and flexible opening and closing;
3) Long service life, can be repeatedly switched on and off;
4) Strong pressure-bearing and high-temperature resistance, and a wide range of applications. 

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