A Complete Guide To Wafer Type Butterfly Valve Installation

Home A Complete Guide To Wafer Type Butterfly Valve Installation
15/11/2022
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A triple offset butterfly valve
Source: Dombor 

One of the most prevalent valve types in commercial pipelines is the wafer butterfly valve. The wafer butterfly valve is a relatively compact device. The butterfly valve merely needs to be installed in the center of the pipeline’s flanges at each end, and stud bolts may then be used to attach it. The clip-on butterfly valve will be closed to regulate the liquid medium. 

The primary difference between lug vs wafer butterfly valve is that wafer style butterfly valves are not compatible to be utilized as tube ends or end-of-line service. Wafer butterfly valves are particularly well suited to locations with limited space or close proximity to pipelines. 

The only impediment to the medium flowing through the valve body when the butterfly valve is completely open is the thickness of the butterfly plate. As a result, the valve produces a significant pressure decrease. A reliable valve manufacturer in china produces the best quality wafer style and lug style butterfly valves. 

What Are Wafer Butterfly Valves 

Wafer Butterfly Valve 2
Source: Dombor 

Two pipe flanges hold a wafer-shaped butterfly valve in place, and the flange bolts encircle the valve body. It is one of the most cost-effective butterfly valves for several applications in different industries. Both the valve body and the flanges are covered by lengthy bolts. A wafer butterfly valve offers sealing against the fluid flow’s bi-directional pressure differential.

The purpose of a wafer butterfly valve is to maintain a seal to guard against dual-directional pressure differential in liquid flow. In order to prevent any backflow in systems that were made for unidirectional flow, the wafer form of butterfly valves was developed to maintain a tight seal and protect against bi-directional pressure differential.

It is done by combining a flat valve face on the downstream and upstream sections of the valve with a tightly fitting seal. A tight seal and a two-way pressure difference are things that the wafer type butterfly valve is intended to guard against. The primary wafer butterfly valve parts are seat, valve body, disc, o-ring, etc. 

Guide To Brief Wafer Type Butterfly Valve Installation 

Wafer Butterfly Valve 1
Source: Dombor 

Pre-installation Precautions

  • Before installation, take precautions by making sure the wafer butterfly valve’s specs and construction materials are in accordance with the design. Acquire the valves from reliable butterfly valve manufacturers
  • Before installation, remove any internal dirt, foreign objects, and residue to prevent leakage or malfunction.
  • To prevent unnecessary stress on the valve after installation, the essential piping needs to be correctly suspended and fastened in accordance with standards before installation.
  • The pipe’s two flange faces should be concentric, parallel, and aligned.
  • During installation, there is no need to place any additional gaskets between the butterfly valve and the flange.
  • The expansion joint is utilized between the two industrial butterfly valves, check valves, or pumps to allow the valve disc to move freely when shutting down.

Wafer Butterfly Valve Installation Instructions 

  • Before installation, rotate the valve disc by 10 degrees.
  • To change the distance between the two flanges, place the auxiliary screws in adequate positions.
  • Place the remaining bolts, making sure to avoid making contact with the butterfly valve’s two flange ridges.
  • The bolts should be constantly latched in a crosswise progressive manner until the flange gets in touch with the end face of the valve body. This is done after verifying that the butterfly valve and the flange are concentric models and that the valve disc switch situation, the inner diameter of the flange, or the adjacent components are blocked.
  • The full opening and closure should be verified once more after installation.
  • Before beginning the procedure, let air into the piping to extract any foreign items and wash the interior with clean water.
  • To prevent turning past the opening width and closure position, open the valve to check the angle indicator.
  • The indication has unconditional control over how the switch operates. If different hand instruments are utilized to lay force, the angle indicator and the button will be harmed.
  • The valve ought to be opened during the pipe pressure test.
  • The metal butterfly valve is in a totally closed condition after piping for a long moment, thus, switching it on and off must be done once every two weeks to prevent fixation.

Precautions To Follow During Wafer Type Butterfly Valve Installation 

Butterfly Valve2
Source: Dombor 

Here are the common wafer type butterfly valve installation precautions. 

  • Cleaning the inner cavity and the sealing surface, making sure the connection bolts are compressed uniformly and making sure the packing is pushed tightly are all important before installing the valve.
  • Gigantic valves and pneumatic control valves should be mounted vertically to prevent leakage from occurring since the valve core’s heavy self-weight will tilt them to one side.
  • Installation of the valve must follow the permitted working position, but awareness needs to be on the comfort of supervision and operation.
  • To prevent crushing the sealing surface of the valve top, the high-performance butterfly valve must be in a partly open condition when the compression screw is tightened.
  • The opening and closing test should be performed as closely as feasible in a cold state prior to inserting the low-temperature valve, and it must be flexible without jamming.
  • To stop the liquid from leaking out along the valve stem and, more importantly, to prevent leakage, the liquid valve must be set up with the valve stem inclined at an angle of 10 degrees to the horizontal.
  • Pre-tighten the connection valve flange after the huge air separation tower has been exposed to the cold to stop leaks at room temperature and leaks at low temperatures.
  • Climbing the valve stem while it is being installed is strictly prohibited.
  • After every valve has been installed, it should be opened and closed again to ensure that it is flexible and not jammed.
  • Non-metallic valves come in a variety of strengths, some of which are hard and brittle. When in use, the force used for opening and shutting must not be excessive, especially not aggressive. Be aware to prevent object collisions as well.
  • When using and putting in the water style butterfly valve, keep in mind to be free of collision and scraping mishaps.
  • In order to prevent leaks and excessive pressure on the valve stem, which can hasten wear and tear and make it challenging to open and close, when using a fresh valve, the packing must not be squeezed too firmly.
  • It is vital to validate that the valve complies with the design specifications and applicable standards before the valve is fitted.
  • At room temperature, the high-temperature valve is placed. Bolts need to be tightened again after use because as temperature increases, the bolts heat up and extend, and the gap widens. Awareness must be given to this issue because leakage might easily happen.
  • When installing the valve, it is important to make sure that the handwheel’s position, installation form, and medium flow direction all adhere to the rules.

Bottom Line 

The applications of wafer body butterfly valves are pretty extensive. They are used in the water treatment plants, sugar industry, waste effluent treatment plants, paper industry, breweries, drilling rigs, chemical industry, heating and air conditioning, gas plant

cooling water circulation, pneumatic conveyors, cement plants, and so on.

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