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Centerline butterfly valve installation

Author: Site Editor     Publish Time: 2018-12-10      Origin: Site

As a component used to realize the on-off and flow control of centerline butterfly valve systems, the centerline butterfly valve has been widely used in many fields such as petroleum, chemical, metallurgy, and hydro power.

Here are the content list:

  1. Structural characteristics of centerline butterfly valve

  2. Preparation before installation

  3. Things need to be focused on during installation

  4. Steps to install butterfly valve



Structural characteristics of center line butterfly valve

The structural characteristics of the center line butterfly valve are that the axis of the stem, the center of the disc and the center of the valve body are in the same position. The utility model has the advantages of simple structure and convenient manufacture. The middle line butterfly valve structure characteristic is the valve stem axis, the butterfly plate center, the body center in the same position. Simple structure and convenient manufacture. Common rubber butterfly valve is one of these. The disadvantage is that the butterfly plate and valve seat are always in the extrusion, scraping state, resistance distance, wear fast. In order to overcome the squeeze, scratch, ensure the sealing performance, the valve seat basically USES rubber or PTFE and other elastic materials, but also because of the sealing material in the use of temperature restrictions, this is why the traditional people think butterfly valve is not resistant to high temperature. A commonly used rubber-lined butterfly valve belongs to this category. In order to overcome extrusion, scratch and sealing performance, the seat is basically made of elastic materials such as rubber or polytetrafluoroethylene, but because the sealing material is limited by temperature, butterfly valves are not considered intolerable.


Preparation before installation:

1. Check the specifications and materials of the butterfly valves in accordance with the design before installation.

2. Clean the internal dust, foreign matter and debris before installation to avoid malfunction or leakage.

3. Before installation, the relevant piping should be properly suspended and fixed according to the regulations to avoid undue stress on the valve after installation.

4. The two flange faces of the piping must be aligned in parallel with each other.

5. No additional gaskets need to be installed between the butterfly valve and the flange during installation.

6. When the butterfly valve is close to the check valve or the pump, the expansion joint is used between the two, and the valve disc switch is not blocked.


Things need to be focused on during installation

1. Open the valve disc 10 degrees before installation. (The same before disassembly)

2. Set the auxiliary screws at the appropriate positions to adjust the distance between the two flange faces.

3. Insert the butterfly valve into the remaining flange without inserting the two flange faces.

4. After confirmation, the center butterfly valve is concentric with the center of the flange. The position switch of the disc is not blocking the inner diameter flange or adjacent mechanical parts. The bolt is locked diagonally repeatedly until the flange surface contacts the surface of the valve body.

5. Full opening and full clearance shall be reconfirmed after the completion of the equipment.


Steps to install butterfly valve

1. Before starting the operation, use the air spray to remove the outside objects on the piping, and clean the inside of the piping with clean water.

2. Open the valve and check the angle indicator disc to avoid twisting beyond the opening width and closing position.

3. The operation of the switch is completely based on the indicator. If other hand tools are applied, the angle indicator plate and the switch will be damaged.

4. When the piping pressure test is to be carried out, the valve should be opened.

5. After the piping, it will be in the state of full closure for a long time. It should be done 1~2 times per month to avoid the fixation.


Above is about how to install centerline butterfly valve, believe that you have received this part of the knowledge, but we still don't recommend that you install the centerline personally butterfly valve, because it need professional knowledge, if you choose our goods, we will provide you with a series of after-sales service, welcome to come to Ningde Hangna, you admire in the heart of choose and buy centerline butterfly valve.

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