Butterfly valve design considerations when considering bearing

Bearings are machine components that support the journal, trunnion, pivot, stub shaft and shaft parts, which reduce friction and ensure swivel accuracy and allow the shaft and shaft parts to rotate, swing or slide. Scientific and reasonable bearing selection or not, not only affect product performance assurance, function realization, but also affect the product manufacturing, operation and maintenance costs. The butterfly valve is one of the fastest growing types of valves in recent years. It can be used for isolation and cutting in the process system as well as for automatic adjustment. The valve is mainly composed of a valve body, a butterfly plate, a valve shaft, a packing, a bearing and a driving device And other components. The output power of the drive is transmitted to the disc via the valve shaft for isolation and disconnection or regulation. Bearing as an indispensable support shaft components, its scientific and reasonable selection is crucial. Structural form Butterfly valve shaft support structure of the general form shown in Figure 1 ~ Figure 4. Figure 1 is suitable for low pressure medium and small size full shaft butterfly valve, the valve shaft is supported by a set of sliding bearings installed on the valve body, the outer diameter of the sliding bearing and the valve body generally use a small clearance fit or transition fit, the inner diameter and the valve shaft Between the general use of H9 / f9 (d9). Figure 1 Figure 2 Figure 3 Figure 4

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