• Categories:Company News
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• Time of issue:2019-06-28
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(Summary description)
Wafer type is cheap, the price is roughly 2/3 of the flange. When choosing imported valves, use the wafer type as much as possible, and the price is cheap. Light weight.

 

Wafer-type valves have longer bolts and require higher construction accuracy. If the flanges on both sides are not aligned, the bolts will be subjected to greater shear force and the valve is prone to leakage. Wafer-type valve bolts are generally relatively long. Under high temperature conditions, the expansion of the bolt may cause leakage, so it is not suitable for large pipe diameters under high temperature conditions.

 

In addition, wafer butterfly valves generally cannot be used at the end of the pipeline and downstream applications that need to be disassembled, because when the downstream flange is disassembled, the wafer valve will fall off. In this case, a short section must be made separately. In order to disassemble, the flange type butterfly valve does not have the above problems, but the cost will be higher.

 

The wafer butterfly valve has no flanges at both ends of the valve body, only a few guide bolt holes, and the valve is connected to the end flange with a set of bolts/nuts. In contrast, disassembly is more convenient, and the valve cost is lower, but the disadvantage is that one sealing surface has a problem, and both sealing surfaces have to be disassembled. The flange type butterfly valve has flanges at both ends of the valve body, which are connected with pipe flanges. The seal is relatively more reliable, but the cost of the valve of this design is relatively high, so the choice is still different.