fluorine lining gate valve

How to distinguish between wafer butterfly valve and flanged butterfly valve

by:Lianke Valve     2022-08-04
The wafer and flange of the butterfly valve are two connection methods. In terms of price, the wafer type is relatively cheap, and the price is roughly 2/3 of the flange. If you want to choose an imported valve, use the wafer type as much as possible, which is cheap and light in weight. Wafer-type valve bolts are long in length and require higher construction accuracy. If the flanges on both sides are misaligned, the bolts will be subject to greater shearing force and the valve will easily leak. Wafer-type valve bolts are generally relatively long. Under high temperature conditions, the expansion of the bolts may cause leakage, so it is not suitable for large pipe diameters under high temperature conditions. Moreover, the wafer type butterfly valve generally cannot be used at the end of the pipeline and where the downstream needs to be disassembled, because when the downstream flange is disassembled, the wafer type valve will fall off. In this case, another short joint must be made. It is easy to disassemble, and the flanged butterfly valve does not have the above problems, but the cost will be relatively high. The wafer type butterfly valve body has no flanges at both ends, only a few pilot bolt holes, and the valve is connected to the flanges at both ends with a set of bolts/nuts. In contrast, disassembly is more convenient, and the cost of the valve is lower, but the disadvantage is that there is a problem with one sealing surface, and both sealing surfaces have to be disassembled. The flanged butterfly valve has flanges at both ends of the valve body, which are connected with the pipe flanges. The sealing is relatively more reliable, but the cost of the valve is relatively high.
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