Everything of Wafer and Lug Style Butterfly Valves: Selection, Installation, Maintenance, and Future Developments


A type of valve called a butterfly valve is used to regulate the flow of different fluids. Lug and wafer are the two main varieties to consider when choosing a butterfly valve. Both operate similarly, but depending on your application, you should choose one over the other.

Understanding the Design and Functionality of Wafer and Lug-Style Butterfly Valves

The specifications of your project will determine which butterfly valve is best. Wafer and Lug style butterfly valves are built of plastic and can be operated pneumatically or electrically, in contrast to lug style butterfly valves, which are often made of metal. Lugged butterfly valves typically have threaded lugs on their flanges for bolt connections and are made of ductile iron or steel. In contrast, wafer butterfly valves are less heavy and expensive than their lug equivalents. 

These valves, which are positioned between pipe flanges, use either a rubber or an EPDM seat to provide an exceptionally robust seal. Butterfly valves with lugs have threaded inserts (lugs) on the outside that are connected to piping flanges by bolts. There are no attachment lugs on wafer butterfly valves. These can be fitted to most flange standards and used in a variety of applications, however, they must be clamped between two pipeline flanges either with rubber or EPDM valve seats.

Advantages and Disadvantages of Wafer and Lug-Style Butterfly Valves in Industrial Applications

Compared to gate valves, globe valves, or other valves, the lug style butterfly valve compact design occupies a great deal less room. A lightweight It is quick acting and opens or closes more quickly than a quarter-turn valve. There are large sizes of the Butterfly Valve, ranging from NPS 112 (DN 40) to above NPS 200. (DN 5000). Both low-pressure drop and high-pressure recovery are present. Provide service that is airtight. Low differential pressure is the only service available for butterfly valve throttling. Turbulence in the flow guides and influences the butterfly valve’s disc movement.

Wafer butterfly valves have a wide range of applications and are very adaptable. Wafer butterfly valves provide an extremely tight seal, making them perfect for applications where the leakage is intolerable. wafer butterfly valves are incredibly simple to install and keep in working order.

Wafer butterfly valves are incredibly affordable, making them a great option for buyers on a tight budget. The flow characteristics of wafer butterfly valves are good. They offer linear flow control and a small pressure drop. Meanwhile, the drawbacks are that Wafer butterfly valves only have a small flow control range. The pressure drop across wafer butterfly valves may be greater. Wafer butterfly valves are prone to clogging due to their design.

Criteria for Choosing Between Wafer and Lug-Style Butterfly Valves

The construction of the lug style butterfly valves should be taken into account first. Stainless steel, aluminum, and polymers like PVC and PP are just a few of the materials that are used to make butterfly valves. The temperature range the valve can take is an additional important consideration. Others can manage fluids that are at high temperatures, while certain materials are only appropriate for low-temperature applications.

The wafer butterfly valve pressure rating should be taken into account as the third element. The sort of connection to the valve has to be taken into account as the fourth factor. Flanged connections are used on some butterfly valves whereas threaded connections are used on others. How the valve will be activated should be the final consideration. Others are pneumatically or electrically actuated, while other butterfly valves are manipulated manually.

Best Practices for Installation, Maintenance, and Troubleshooting of Wafer and Lug-Style Butterfly Valves.

The seal quality of the butterfly valve, whether it is leak-proof or not, and its safety when used in working situations will all depend on how it is installed. The method of installation must be understood by the user.

  • Place the pre-installed flanges between the valve and them. Be mindful of where the bolt holes are.
  • To increase the flange’s surface smoothness, insert four bolts, nuts, and bolts into the flange’s hole; after that, make sure the nuts are just barely tightened.
  • To attach the flange to the pipe, spot welding is employed.
  • Disconnect the valve.
  • The flange needs to be securely fastened and completely linked to the pipe.
  • After the weld connection has had a chance to cool, install the valve. Also, make sure a suitable-sized valve is installed.
  • Check to see that the valve is positioned properly. Ensure the four bolts are in the valve.
  • Open the valve to make sure that you can freely open and close it. Afterward, gradually permit the valve plate to open.
  • Be sure to uniformly tighten all nuts.
  • Verify that the valve opens and closes easily

Butterfly valves with threaded lugs on their flanges for bolt connections are often made of ductile iron or steel. Because of their layout, they are ideal for end-of-line service applications Compared to their lug equivalents, wafer butterfly valves are cheaper and lighter. These valves, which are installed in between pipe flanges, use either a rubber or an EPDM seat to provide an extraordinarily robust seal.

Butterfly valves, which can be quarter-turned, limit the flow of solid, liquid, or gaseous materials. They are utilized in a variety of processes, including food processing, pharmaceuticals, handling chemicals, and petroleum. Metal lug style butterfly valves with lugs are made of ductile iron or steel and have threaded lugs on their flanges for bolt connections.

Future Developments and Troubleshooting

The bulk of problems with butterfly valves or swing check valves are due to improper installation rather than the valve itself. For this reason, it is important for any butterfly valve manufacturer to ensure proper installation of lug style butterfly valves throughout the commissioning process in order to reduce maintenance concerns. The seal’s composition, which must be elastomer, must be checked during installation, as it tends to travel in a specific direction and then gets compressed as the valve is installed. For wafer butterfly valves, butterfly valve manufacturers must take care to avoid hiding sealing material when fitting the valve. By following these guidelines, butterfly valve manufacturers can help ensure proper functioning of their valves and minimize maintenance issues for end-users.

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