Difference Between Wafer Style Butterfly Valve and Lug Style Butterfly Valve

Understanding of wafer style butterfly valve

The butterfly plate of the clamp type butterfly valve is installed in the diameter direction of the pipeline. The disc-shaped butterfly plate rotates around the axis in the cylindrical passageway of the valve body, and can adjust the flow rate between 0° and 90°. When the butterfly plate rotates to 90°, the valve reaches its maximum opening. Wafer style butterfly valve has a simple structure, small size, light weight, and consists of only a few parts. It only needs to rotate 90° to quickly open and close, with simple operation, and has good fluid control characteristics.

What are the differences between wafer style butterfly valve and flange butterfly valve?

Butterfly valves are widely used, and commonly used wafer type valve can be divided into two types: clamp type butterfly valve and flange type butterfly valve. Now let us take a look at the differences between these two types of butterfly valves.

Different Connection Methods

Clamp and flange are two different types of connection methods.

Wafer style butterfly valve: there is no flange on the valve body, the valve is connected between the two pipeline flanges with double-ended bolts, the two flanges clamp the butterfly valve, and then the two flanges are fixed with bolts.

Flange butterfly valve: there is a flange on the valve body, and the valve is connected to the pipeline flange with bolts on both ends of the valve.

Different Structures

The bolts matched with wafer style butterfly valve are relatively long, and there is no flange on the valve body, so it is generally not installed at the end of the pipeline and downstream position where dismantling is required. Because when the downstream flange is removed, the clamp-type valve will fall off, so that the pipelines at both ends of the valve can not work normally; while the flange butterfly valve does not have this problem, the flange itself has a flange paired with the pipeline flange, connected by bolts and nuts. So when one end is removed, it will not affect the operation of the other end.

Different Costs

The bolts of the wafer style butterfly valve are relatively long, and the construction accuracy is relatively high. If the flanges on both sides are not aligned, the bolts will be subjected to relatively large shear force, which will cause the valve to leak easily; comparatively speaking, wafer style butterfly valve is easier to disassemble, and the valve cost is lower. However, if one sealing surface has problems, both sealing surfaces need to be disassembled.

The above is the comparison between wafer style butterfly valve and flange butterfly valve. Although the difference seems to be small, it still has certain differences. You should pay attention to distinguishing them.

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