Lug Type Butterfly Valves

There are threads inserted at the two sides of the body of the lug-style butterfly valve. There is a set of two bolts used here. Each flange uses a separate set of bolts. Thanks to the threads, there is no need of using nuts, and the purpose is accomplished with the help of two sets of bolts. In this way, if one side of the piping system gets disconnected, the other side is not disturbed.

For dead-end services, the lug style butterfly valves usually have a lower pressure rating. Think of it like this: a lug style butterfly valve mounted between two flanges is at a pressure rating of 1000 kPa. But if we mount the same valve on one flange (dead-end service), then the pressure rating is at 520 kPa. This shows a significant reduction in pressure rating from two flanges to single flange mounting.

A notable characteristic of lug-style butterfly valves is their resistance to chemicals and other solvents. They can cope with temperatures of up to 200 degrees. This makes lug-style butterfly valves a very versatile solution.

  • MOQ: 1 PCS (Buy more save more)
  • Available in standard valves and custom valves.

Best Lug Type Butterfly Valves for Sale

What Is Lug Type Butterfly Valve

Lug type butterfly valves are made up of metals such as steel or ductile iron. These valves usually consist of threaded tapped lugs placed on the flanges of the valve for bolt connections.

Lug type butterfly valves are favorable for end-of-line service, and for this purpose, a blind flange is usually recommended. If there is a need to clean the lug-type butterfly valve, you don’t need to shut down the entire system. Similarly, there is no need to shut down the system if you want to inspect, replace, or repair a lug-type butterfly valve.

Difference Between Wafer and lug-type Butterfly Valve

Wafer-type butterfly valves are specially designed for holding the two flanges in the pipework. For wafer-type butterfly valves, if there is a need for maintenance or repairing, you have to shut down the entire system.

Lug Type Butterfly Valve Application

There are several applications in which lug-type of valves are used. Lug-type butterfly valves are widely used in industrial sectors, including the chemical industry, oil industry, food processing, Pharmaceutical, water industry, and wastewater management.

Lug Type Butterfly Valve Advantages

There are many advantages of this type of butterfly valve, such as:

  • They are used in bidirectional sealing.
  • Light in weight
  • Small size butterfly valves
  • Replaceable body seat and low-pressure drop
  • It is effortless to install and maintain lug-type butterfly valves.
  • It is convenient to install the lug-type butterfly valve in any vertical, diagonal, or horizontal position.

Lug Type Butterfly Valve Materials

Body Materials

Cast Steel, copper alloys, stainless steel, all type of ductile cast Steel

Disc Materials

Copper alloy, cast iron, cast steel, stainless steel, all types of ductile cast iron

Lug-type Butterfly Valve Installation

1.The installation of these types of valves is straightforward. After the installation of the valve and the pipe, there is installation of two sides flanges. They are properly installed so that there is no squeezing of the valve body’s sealing surfaces by the bolts. This thing is perfect for the sealing life of the valve.

2.It is very easy to install the lug-type butterfly valve in the discharge position.

3.These bolts are smaller in size. Their small size is beneficial in avoiding defects because large size valve bolts are easy to leak.

You Can easily calculate the Bolt length where the whole of the bolt is attached with the thread. Then you can easily install the lug-type butterfly valve.

First of all, one of the nuts of the bolt is removed and twisted. And then, in the end, the nut is tightened. On the lug-type butterfly valve, two holes are present.

The bolt will pass through if it is a through-hole. So we can say that it is effortless to install the bolt with these holes. Then it is convenient to tighten the valve by bolting the two flanges to give rise to clamping force.