Butterfly Valve Introduction Guide

Jun. 22, 2021

Butterfly Valve Introduction Guide

The invention of the butterfly valve has improved the processes and applications of various industries.

What is a butterfly valve?

The butterfly valve is a mechanism that regulates the flow of materials in a large pipe diameter through a quarter-turn rotation of the disc.

A rod passes through the center of the disc, and this rod is connected to a drive that controls the movement of the disc. The position of the disc is parallel or perpendicular to the flow of the medium. The butterfly valve is different from other valves because the butterfly plate is always in the fluid, resulting in pressure changes at any position of the valve.

Why is it called a butterfly valve?

Some valves are named after their shapes, such as ball valves, globe valves, needle valves, etc. Other valves are named after their movement and function: gate valve, plug valve, pinch valve, life valve, slide valve, etc. The butterfly control valve is also named for its movement.

The butterfly valve gets its name because its movement is similar to that of wings in flight. The rod is similar to the body of a butterfly, and the disc moves like a butterfly's wings. The movement of a butterfly valve is similar to that when a butterfly descends, its wings move up and down in a 90-degree motion.

What is the purpose of the butterfly valve?

The butterfly valve regulates the flow by starting, decelerating, or stopping the medium. The disc opens and closes with a low torque of 90 degrees, which is suitable for any compatible application. Because of their low cost and lightweight, butterfly valves are generally more popular than other types of valves.

Butterfly valve

Butterfly valve

For some processes, extreme temperatures and corrosion are factors that can easily damage the valve seal. Butterfly valves can withstand extreme cold or extreme heat. This means that the integrity of the sealing device is critical for high-risk applications such as energy production and oil processing (because a leak may threaten public safety or the environment).

Where is the butterfly valve located?

There are some standard guidelines for the positioning of butterfly valve components. The butterfly valve needs to have a certain distance from other parts, such as pumps, elbows, and another valves-6 pipe diameter separation is ideal.

Generally, the valve stem of a butterfly valve is installed vertically with the actuator directly above it, but in some cases, the valve stem is installed horizontally. When connected to a pump or check valve, the disc must have a gap to avoid interference with other nearby components.

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