Installation Guides for Wafer Butterfly Valves

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Installation Guides for Wafer Butterfly Valves

Mesajde landeepipeline » Mar Sep 06, 2022 6:01 am

Wafer butterfly valves are one of the most common types of valves in industrial pipelines. Considering the relatively small structure, we just need to put the butterfly valve in the middle of the flanges at both ends of the pipeline and lock the valve and flanges with studs to control the fluid medium. Wafer butterfly valves are particularly suitable for situations where the space is narrow or the distance between pipelines is short. When the butterfly valve is in a fully open state, the thickness of the disc is the only resistance to the medium flowing through the valve. Hence, the pressure produced by this type of valve is very small so that it features good flow control.

I. Installation Instructions for Wafer Butterfly Valves

1. Before installation, remove the external objects on the piping with air spray and clean the inside with clean water.

2. Carefully check whether the use of the valve is in accordance with its performance specifications

3. Examine whether there are other things in the channel and sealing surface of the valve. If any, clear them in time.

4. The valve needs to be installed without delay after the worker unpacks it. Do not loosen any fastening screws or nuts on the valve at will.

5. Wafer butterfly valves must be applied with the special flanges for butterfly valves.

6. Electric butterfly valves can be installed on pipelines which are angled with any conditions. It’s recommended not to install them upside down for later maintenance.

7. Ensure that the flange face and the rubber sealing are in alignment, with the screw being tightened evenly and the sealing surface being fitted completely. If the force for tightening screws is uneven, the disc may be stuck because of the bulge of the rubber, causing leakage at the valve stem.

II. Installation Steps for Wafer Butterfly Valves

The correct installation of wafer butterfly valves is related to the sealing of the valve and the question that whether leakage will occur. Workers need to understand the process of installation to operate safely.

1. Place the valve between the two preinstalled flanges and the bolt holes should align.

2. Gently insert the four pairs of bolts and nuts into the flange holes. Tighten the nuts slightly to correct the flatness of the flange surface.
3. Spot weld the flanges to the pipeline.

4. Remove the valve.

5. Fix the flanges on the pipeline by welding.

6. Install the valve after the welding point cools. Ensure that there is enough space between the flanges so that the valve can be moved and will not be damaged.

7. Correct the position of the valve and tighten the four pairs of bolts (Do not overtighten.).

8. Open the valve to guarantee the plate can open and close freely. Slightly open the plate.

9. Tighten all nuts evenly.

10. Reconfirm that the valve is in the free open-close operation. (Note: Ensure that the plate of the valve does not touch the pipeline.)

Wafer butterfly valves ought to be laid flat without clash and impact before installation. And it is not free to dismantle the valve. At the same time, we also need to know that wafer butterfly valves can be installed in any position. However, after the wafer butterfly valve is installed, workers need to lay the butterfly valve along the line and make a bracket for the wafer butterfly valve. Once the bracket is made, it is strictly prohibited to remove the bracket when operating.

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