A butterfly valve is a quarter-turn rotary device used to control fluid flow in a piping system. It operates with a rotating disc positioned within the flow path. The disc is controlled by an external actuator connected through a stem. When the disc aligns with the flow direction, it fully blocks the flow. Conversely, when the disc is perpendicular to the flow, it allows the fluid to pass through. Opening or closing the valve requires a 90° rotation of the disc.Butterfly valves are quarter-turn valves likeball valvesand plug valves. They have a fairly simple construction and operation mechanism, and they have a compact size designed to fit two pipe flanges. They can be operated manually or by an automatic actuating mechanism that is integrated into the process control system of the pipeline. They are ideal for on-and-off applications, but their applications to flow throttling are limited.Butterfly valves come in various types and designs, each rated for different temperatures, pressures, and flow rates. These valves are tailored to meet the specific requirements of pipeline systems that handle both liquids and gases.

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