A butterfly valve is a type of rotary valve known for its compact structure, lightweight design, and fast opening and closing performance. It is widely used in industries such as water treatment, chemical processing, oil and gas, and power generation to shut off or regulate fluid flow.

What Is a Butterfly Valve?

A butterfly valve is a type of valve that uses a circular disc (also known as a "butterfly") which rotates 90 degrees around its own axis to open or close the flow path. Due to its simple structure, compact size, and flexible operation, it is particularly suitable for large-diameter, low-pressure piping systems.

A typical butterfly valve consists of a valve body, stem, disc, sealing ring, and actuator. Common actuation methods include manual, worm gear, pneumatic, and electric.

How to Identify a Butterfly Valve

Distinctive Appearance

A butterfly valve is easily recognizable by its central circular disc (butterfly) mounted on a central shaft, which rotates to open or close the valve. The overall shape is typically flat and round, making it visually distinct from ball valves or gate valves.

Short Rotation Angle

The disc generally rotates only 90 degrees to fully open or close the valve. This quick open-close mechanism is a key identifying feature.

Various Mounting Styles

Butterfly valves are commonly installed in wafer, flanged, or lug styles. These connection types are easy to distinguish and often conform to standard flange dimensions.

Wide Range of Applications

Butterfly valves are widely used in systems transporting water, air, gas, steam, or slurry. They are especially common in low to medium pressure and large-diameter pipelines.

Common Types of Butterfly Valves

Soft-Seated Butterfly Valve

Offers excellent sealing performance; suitable for low-pressure and room-temperature media.

Metal-Seated Butterfly Valve

Resistant to high temperature and pressure; ideal for industrial applications.

Triple Offset Butterfly Valve

Provides superior sealing capabilities; designed for high-pressure and high-temperature environments.

Conclusion

For engineers, procurement officers, or project managers, quickly identifying a butterfly valve and understanding its structure and function can lead to more efficient and safer decision-making during valve selection.

Thanks to their compact design, ease of maintenance, and cost-effectiveness, butterfly valves play a crucial role in many industrial applications.