Flanged Butterfly Valves

Flanged butterfly valves are a type of industrial valve commonly used to control the flow of fluids (liquids or gases) within a pipeline. They belong to the category of quarter-turn valves and are particularly well-suited for applications where a fast shut-off or throttling control is required. The "flanged" aspect refers to the valve's end connections, which are designed with flanges that can be bolted to pipe flanges, ensuring a secure and leak-tight connection.

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Here are some key features and characteristics of flanged butterfly valves:
Quarter-Turn Operation: Flanged butterfly valves operate on a quarter-turn principle, meaning they only need a 90-degree rotation of the disc (the butterfly) to go from fully closed to fully open or vice versa. This design allows for quick and efficient flow control.
Disc and Seat Design: The valve's disc is a flat, circular plate that is positioned in the center of the pipe. When the disc is turned perpendicular to the flow direction, it creates a full closure. When it's turned parallel to the flow direction, it allows fluid to pass through. The disc seals against a soft seat or a metal seat to prevent leakage.
Flanged End Connections: Flanged butterfly valves have flanged ends that enable them to be easily bolted to the flanges of the adjoining pipes. This connection method simplifies installation and maintenance, and it's also commonly used in larger-sized pipelines.
Sizes and Applications: Flanged butterfly valves come in a range of sizes, from small to very large diameters, making them suitable for various industrial applications, including water treatment, HVAC systems, power generation, chemical processing, oil and gas, and more.
Flow Control: While flanged butterfly valves are excellent for quick shut-off, they are also used for throttling control when the flow needs to be adjusted gradually. However, they may not provide as precise control as some other types of control valves.
Cost-Effective: Flanged butterfly valves are generally more cost-effective compared to other valve types, making them a popular choice for many industries.
Low Pressure Drop: The streamlined design of the disc and the relatively short travel required for operation result in a lower pressure drop across the valve compared to some other valve designs.
Lining and Materials: Depending on the application and the type of fluid being handled, flanged butterfly valves can be constructed from various materials, including metals and plastics. They can also be equipped with various lining materials to enhance their resistance to corrosion and wear.
Manual and Actuated Operation: Flanged butterfly valves can be operated manually using a lever or a handwheel, or they can be automated using various types of actuators (electric, pneumatic, or hydraulic) for remote control and monitoring.

Overall, flanged butterfly valves offer a good balance of performance, cost-effectiveness, and ease of maintenance, making them a popular choice for a wide range of industrial applications where reliable flow control is essential.

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