Single eccentric butterfly valve: In order to solve the problem of the pressing of the butterfly plate and the valve seat of the concentric butterfly valve, a single eccentric butterfly valve is generated, and the structural feature is that the valve shaft axis deviates from the center of the butterfly plate, so that the lower end of the butterfly plate no longer becomes Rotating the axis, dispersing, and reducing the excessive extrusion of the lower end of the disc and the valve seat.
Double eccentric butterfly valve: Further improved molding on the basis of single eccentric butterfly valve is the most widely used double eccentric butterfly valve. The structural feature is that the stem axis is offset from the center of the disc and from the center of the body. The double eccentric effect allows the disc to be quickly disengaged from the valve seat after the valve is opened, which greatly eliminates unnecessary over-squeezing and scraping of the disc and the valve seat, reduces the opening resistance, reduces wear and improves The seat life.
Three eccentric butterfly valves: To withstand high temperatures, hard seals must be used, but the leakage is large; for zero leakage, a soft seal must be used, but it is not resistant to high temperatures. In order to overcome the contradiction of the double eccentric butterfly valve, the butterfly valve was subjected to the third eccentricity. The so-called third eccentricity means that the shape of the sealing pair is not a positive cone but a tapered cone.
Variable eccentric butterfly valve: The unique feature of the eccentric butterfly valve is that the valve stem shaft of the butterfly plate is a three-stage shaft structure. The two-stage shaft stem is concentric with the two shaft segments, and the central shaft axis and the two end axes Deviating from a center distance, the disc is mounted on the intermediate shaft section. Such an eccentric structure causes the disc to become double eccentric in the fully open position and to be single eccentric when the disc is rotated to the closed position. Due to the action of the eccentric shaft, the disc is moved into a distance from the sealing cone of the valve seat when it is close, and the butterfly plate and the sealing surface of the valve seat are matched to achieve a reliable sealing performance.
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Product size
Led Point Lamp,Blue Point Led Lamp,Led Point Ovale,Led Blue Point
Jiangsu chengxu Electric Group Co., Ltd , https://www.chengxulightings.com