Difference between the wafer type butterfly valve and flange type butterfly valve
Wafer type butterfly valve and flange type butterfly valve are two common types of butterfly valves. The scope of application of the two types of butterfly valves is very wide, but many people can’t tell the difference between the wafer type butterfly valve and the flange type butterfly valve, and they don’t know the difference between the two.
VALTECCN valve suppliers tell you that 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 that 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. (Recommended by butterfly valve manufacturers: VALTECCN China Valve Manufacturing Co., Ltd.)
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, a short joint must be made separately. 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.
Any issue about the butterfly valve during the project process, please do not hesitate to contact us. We are a pleasure to help you resolve the problem.