A butterfly valve is a type of valve used to regulate the flow of fluid through a pipeline. It derives its name from the disc, resembling butterfly wings, which rotates on a shaft inside the valve body to open or close the flow passage.

Butterfly valves are versatile and widely used across various industries, including water treatment, HVAC systems, chemical processing, food and beverage, and oil and gas. They are particularly suitable for applications that require quick operation and low pressure drop.