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Flange telescopic butterfly valve application: The butterfly plate of the flange telescopic butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the telescopic butterfly Didlink valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When the rotation reaches 90°, the Didlink valve is fully opened. Applicable temperature ≤80°C, used in petroleum, chemical, food, medicine, textile, paper, electricity, water supply and drainage, gas pipelines, as a flow adjustment and intercepting medium, and has the function of compensating for thermal expansion and contraction of pipelines.

Advantages and disadvantages of flange telescopic butterfly valve: Flange retractable butterfly valve (the structural length can be retracted within a certain range), which not only brings convenience to the disassembly and assembly of the valve, but also relieves pipeline stress, protects the valve, and also condenses the installation method of butterfly valve plus retractor , The space is more compact. Normally, this kind of valve does not require special maintenance, just regularly observe whether there is any leakage and pull-off in the telescopic part. The cost of flanged telescopic butterfly Didlink valve in the initial investment is lower than the installation method of flanged butterfly valve and telescopic device, but considering the maintenance cost in the future, it is not worth the loss. If the sealing part of the butterfly valve is damaged and the sealing ring cannot be replaced and the butterfly valve needs to be scrapped, even the telescopic part will be scrapped and the loss will be greater. For example, when the sealing part of the butterfly valve needs maintenance, the valve cannot be achieved by only compressing the expansion part.)The installation method of the butterfly valve plus the expansion device has great advantages. It only needs to remove the expansion device. The manual inspection space can realize the maintenance-free valve (the butterfly valve is heavy, the retractor is light, and the labor intensity of removing the retractor is low).

Precautions for installation of flange telescopic butterfly valve:

1. It is strictly forbidden to disassemble the butterfly valve of the disintegrated telescopic flange at the pipeline construction site; it is strictly forbidden to repeatedly lengthen and shorten the butterfly valve on the site.

2. The pipes at both ends of the telescopic valve must be concentric, and the two flange surfaces on the pipe must be parallel;

3.Flange fixing bolts should be tightened symmetrically, please do not forcibly tighten flange fixing bolts unilaterally;

4. The telescopic tube is installed behind the valve;

5. The telescopic part of the telescopic valve shall not be installed at the corner of the pipe or at the end of the pipe.

6. The telescopic flange butterfly valve must be placed flat before installation, and do not bump it at will;

7. The structural length of the telescopic flange butterfly valve is the minimum length when it leaves the factory. When installing, pull it to the installation length (ie the design length);

8. When the length between the pipelines exceeds the installation length of the telescopic butterfly valve, please adjust the pipeline interval, and do not force the telescopic valve to avoid damage to the telescopic valve;