Bearing is a supporting shaft neck, trunnion, pivot, short shaft and shaft parts, used to reduce the friction and ensure that the rotation accuracy, and make the shaft, in which the rotation axis parts and swing or sliding machine parts. Bearing type selection of scientific and reasonable or not, not only influence the realization of the assurance of product performance, functionality, and affect the product manufacturing and operation maintenance cost. Butterfly valve is one of the fastest developing speed in recent years, valve type, its in process system can be used as isolation to cut off the, also can be used for automatic adjustment, mainly by the valve body, disc, shaft, filler, such as bearings and drive components. Drive the output of the power, through the valve spindle is passed to the butterfly plate, so as to realize isolation cut off, or regulating function. Bearing support, as an essential part of valve shaft parts, it is very important for the scientific and reasonable selection. Structure the general form of butterfly valve shaft support structure as shown in figure 1 ~ figure 4. Figure 1 is suitable for low medium-pressure small specification entire shaft type butterfly Industrial Valves, valve shaft installed on the valve body by a sliding bearing, the supporting of the sliding bearing outside diameter and body generally adopt the small clearance fit or transition fit, between diameter and valve spindle generally USES H9 / f9 ( d9） 。 Figure 3, figure 1, figure 2 in figure 4
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need fuel for energy,while resilient seated valve do not.
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