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A butterfly valve is a type of quarter-turn valve that is widely used in various fluid control systems. The following presents a detailed account:

Structure

• Disc: It is the core component of the butterfly valve, which is usually disc-shaped and can rotate around the axis in the center of the valve body. The disc is the part that actually controls the flow of the medium. When the disc rotates to different angles, it can block or allow the passage of the fluid to different extents.
• Seat Ring: The seat ring is installed on the inner wall of the valve body and cooperates with the disc to achieve the sealing function. When the butterfly valve is closed, the disc fits closely with the seat ring to prevent fluid leakage.
• Valve Body: The valve body is the shell of the butterfly valve, which provides support and connection for other components. It is usually connected to the pipeline through flanges, threads or welding and other methods.

Working Principle

• A butterfly valve operates by rotating the disc within the valve body. When the disc is rotated to a position perpendicular to the direction of fluid flow, the valve is in the closed state, completely blocking the passage of the fluid. As the disc rotates and gradually aligns with the direction of fluid flow, the valve opens, and the fluid can pass through the valve. The opening degree of the valve can be adjusted by controlling the rotation angle of the disc, thereby precisely controlling the flow rate of the fluid.

Characteristics

• Simple Structure: Butterfly valves have a relatively simple structure with few components, which makes them easy to install, maintain and repair.
• Small Pressure Drop: When the butterfly valve is fully open, the disc has little resistance to the fluid, resulting in a relatively small pressure drop in the pipeline and low energy consumption.
• Quick Opening and Closing: It only needs to rotate 90 degrees to complete the opening and closing operation, so the opening and closing speed is fast, which can meet the needs of occasions that require quick response.
• Good Sealing Performance: With the continuous improvement of manufacturing technology, the sealing performance of butterfly valves has been continuously improved. Many butterfly valves can achieve zero leakage under certain pressure and medium conditions.

Application Scenarios

• Water Supply and Drainage Systems: They are used in urban water supply and drainage pipelines, sewage treatment plants and other projects to control the flow of water.
• HVAC Systems: In heating, ventilation and air conditioning systems, butterfly valves are used to adjust the flow of air and water to achieve the control of temperature and air volume.
• Chemical Industry: In chemical production processes, butterfly valves are used to control the flow of various corrosive media, such as acids, alkalis and salts.
• Power Plants: They are widely used in power plant pipelines to control the flow of steam, water and other media.

In conclusion, the butterfly valve, with its unique structure, simple operation, and multiple advantages, has become an indispensable part of numerous industries. Its ability to control fluid flow effectively and efficiently makes it a preferred choice for a wide variety of applications, from everyday water management to complex industrial processes.