How To Install A Butterfly Valve?

Butterfly valves must be carefully installed and regularly maintained to work at their best. This part drives into excessive depth about installing a butterfly valve. View more of the most important things you should consider to avoid future problems. 

Pre-Installation Instructions for Butterfly Valve

  • To ensure the butterfly valve is installed and works properly, it is important to carefully plan and prepare before installing it.
  • Ensure the temperature and pressure during operation are within the range the installed butterfly valve recommends.
  • Ensure that the material used to make the butterfly valve is chemically suitable for the medium used.
  • Check the valve’s flange ends and the pipeline’s matching flanges to make sure they are clean and damage-free. Also, make sure that the tubing is lined up correctly.
  • Measure the distance between the pipe ends to ensure enough room for the valve to be installed.
  • Ensure you can easily access the lifting tools you need to place bigger valves.
  • Make sure that there are no blockages and that the sizes of the lines that are already there match the sizes of the valve’s ports. When bigger valves are used, their weight can stress the pipes so that they may need extra support.
  • For best performance, install butterfly valves at least four pipe diameters away from downstream components and six pipe diameters away from upstream components. This helps stabilize flow and lower turbulence, ensuring the valve works well by reducing flow problems.

How To Install a Butterfly Valve?

View the step-by-step instructions for fitting a butterfly valve to do it right the first time quickly and easily. 

Step 1: 

First, set in the handwheel or handle for a gear-controlled valve if the valve is worked by hand. Turn the handwheel or button clockwise to ensure the valve is shut. The disc must be straight across from the ends.

Step 2: 

If the disc isn’t straight across from the ends, loosen the top plate by taking off two bolts. Then, turn the lever counterclockwise until the disc is in the middle and straight across from the ends, and then tighten the top plate. For gear-operated valves, check the hex nuts on the side of the shaft. Open and close the disc many times to make sure it works right. If re-alignment is important, do this process again. 

Step 3: 

Connect the valve to the pipes. It is important to remember that lug-style butterfly valves are install between the flanges and have small cap screws on the bottom and top of the valve. On the other hand, the wafer-style valves are placed between the flanges and held in place by fully threaded pins.

Step 4: 

Disperse the flanges so they are 3/16′′ bigger than the valve’s face-to-face size. This will keep the sealing face of the seat from getting grimaced or damaged. Ensure that the pipe flange sides are free of any scale, dirt, welding slag, or metal bits not part of the pipe. 

Step 5: 

Install the disc back together and carefully place it between the edges. Make sure it is lined up and in the middle. It is important to remember that the upstream and downstream pipe ends must be perfectly centered for the valves to work properly. Make sure the valve is centered on the flanges and tighten the flange bolts by hand while slowly pulling the flange spreader away.

Step 6: 

Slowly open the valve until it is completely open. This will ensure that the disc can move easily and that there is no link between the pipes or flanges. Putting valves in pipes that have smaller-than-usual inside sizes, like thick wall pipe, plastic-lined pipe, decreasing flanges, or as-cast flanges, can cause the discs to not work properly.

If you connect straight to a swing check or quiet check, it could also cause problems. Correct actions must be taken to eliminate these blockages, such as drilling the tube to a smaller diameter or adding a gap or spool piece.

Step 7: 

After ensuring everything works right, the flange nuts must be tightened to the stated pressure values. A star or criss-cross pattern ensures the nuts are packed properly.

Step 8:

 Pump up the pipes that lead to the valve and look for leaks. When tightening nuts, use a cross-over design and slowly increase the torque if you see leaks. The worker has to ensure the bolts are strong enough for the job. Bolts must be neat, clean, and free of grease.

Final Thoughts:

At first glance, installing a butterfly valve might look hard, but anyone can do it with just a few easy steps! If you carefully follow this guide and ensure accurate measurements before buying any parts, you should be able to quickly and easily get everything put properly. 

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