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COVNA: The first brand solenoid valve electric

As one of the most common valves in pipelines, the electric butterfly valve is used to realize the on-off of various 

media in the pipeline system and the control of the flow rate. It has been widely used in many fields such as 

petroleum, chemical industry, metallurgy, and hydropower. application. Then in the commonly used electric 

butterfly valve, it can be mainly divided into two types, electric wafer butterfly valve and electric flange 

butterfly valve, and these two kinds of valves have their own characteristics, and the performance is 

not the same, they can be used in Different industries.

For these two kinds of valves, in addition to the different structural forms, if they are in the same parameter, 

the biggest difference is that the connection method is different, that is, the installation form is different, 

which depends on the site conditions!

The difference between electric wafer butterfly valve and electric flange butterfly valve:

The thickness of the electric wafer butterfly valve is relatively thin compared to the flanged butterfly valve. 

There are no flanges at both ends of the valve body, only a few guide bolt holes. The valve uses a set of 

bolts/nuts to connect with the flange of the pipe end, generally applicable It is used in places where the 

space is relatively narrow or the pipeline is restricted. The advantage is that it is more convenient to 

disassemble, the valve cost is lower, and the space is small, but the disadvantage is that one sealing surface 

has a problem, and both sealing surfaces have to be disassembled!

The electric flange butterfly valve has flanges on both ends of the valve body, which are connected with the 

pipeline flange. Compared with the wafer butterfly valve, the sealing performance is more reliable. 

It is generally used in places with larger diameters or higher pressures, but the cost is relatively good. 

Clip-on butterfly valve is high.

Choice between the two:

However, there are still some things to pay attention to in the design. For example, 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. . Another example is the wafer 

butterfly valve generally cannot be used in the end of the pipeline and the downstream need to be disassembled, 

because when the downstream flange is removed, the wafer valve will fall off. In this case, it must be shortened 

separately. The flange type butterfly valve does not have the above problems, but the cost will be higher.