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A butterfly valve is a compact, lightweight, and efficient flow control device widely used in industrial pipeline systems for regulating and isolating media. It operates through a 90-degree rotation of the disc, enabling quick opening and closing with low flow resistance and cost efficiency. Based on structure and sealing design, butterfly valves are classified into concentric, eccentric, and triple-offset types, suitable for low-pressure, high-cycle, and high-temperature high-pressure applications respectively. With excellent sealing performance and strong compatibility with automation systems, butterfly valves are widely used in chemical, power, metallurgy, environmental protection, and food industries, and are continuously evolving toward smarter and higher-performance solutions.