What Is Fully Lugged Butterfly Valve

What is Fully Lugged Butterfly Valve

Definition of “Fully Lugged”

A “fully lugged” butterfly valve is a type of butterfly valve design. The “lugs” are projections or ears on the side of the valve body.In a fully lugged butterfly valve,these lugs are present on both sides of the valve body around the circumference.The main purpose of the lugs is to provide a means for easy and secure bolting of the valve to the pipeline flanges.

A butterfly valve is a type of flow control valve commonly used in various industrial applications to regulate or isolate the flow of fluids (such as liquids, gases, or slurries) through a pipe. It gets its name from the "butterfly" shape of its disc, which rotates within the valve body to control fluid flow.

Key Features of a Butterfly Valve:

Disc: The key component that controls flow, which is mounted on a rod. The disc rotates to allow, restrict, or stop the flow of fluid. When fully open, the disc is parallel to the flow of fluid, and when fully closed, it is perpendicular, blocking the flow.

Body: The main structure of the valve, typically placed between two pipe flanges. Butterfly valves can be wafer-style (clamped between two pipe flanges) or lug-style (bolted to the flanges using lugs).

Actuator: The mechanism used to open, close, or adjust the valve. It can be manual (with a handle or gear) or automated (using electric, pneumatic, or hydraulic actuators).

Simplicity: Compared to other types of valves (such as gate or ball valves), butterfly valves are lightweight and compact, making them easy to install and operate.

How It Works:

Open Position: When the disc is turned parallel to the flow, the valve is fully open, allowing fluid to flow through with minimal obstruction.

Closed Position: When the disc is rotated 90 degrees to be perpendicular to the flow, it blocks the fluid, effectively closing the valve.

Partial Opening: By rotating the disc at angles between fully open and fully closed, the flow rate can be controlled.

As for the term "fully lugged," it typically refers to a specific design feature of butterfly valves. A fully lugged butterfly valve has lugs or projections on the disc that match corresponding recesses in the valve body. A fully lugged butterfly valve has threaded inserts, or lugs, around the outer edges of the valve body. This design provides a more secure and positive sealing action by preventing the disc from rotating out of alignment. It also helps to distribute the pressure more evenly across the sealing surface, enhancing the valve's performance and durability.A fully lugged butterfly valve is designed for secure installation and allows for partial system isolation, making it ideal for systems that require frequent maintenance or isolation of one side of the piping.

Butterfly valves are widely used in industries like:

Water treatment

HVAC systems

Chemical and petrochemical industries

Food and beverage processing

Pharmaceuticals

In summary, the choice of material for butterfly valves depends on the operating conditions and the required properties such as corrosion resistance, temperature resistance, and mechanical strength. A fully lugged butterfly valve features a specific design that enhances sealing and pressure distribution.

WKT is a leading manufacturer of industrial valves, providing reliable and high-performance valve solutions to industries worldwide. With decades of experience, we are committed to excellence, innovation, and customer satisfaction. Our wide range of products includes ball valves, gate valves, butterfly valves, and custom-engineered solutions designed to meet the demands of complex industrial applications.

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