Butterfly valves are installed in pipelines and operate by rotating a disc-shaped closure element around an axis within the cylindrical body of the valve. The disc rotates between 0° and 90°, with the valve fully open when the disc is rotated to 90°. These valves have a simple design, compact size, and lightweight construction, typically consisting of only a few components. They can be opened or closed quickly with just a 90° rotation, making them easy to operate. Additionally, butterfly valves offer excellent flow control characteristics.
When fully open, the disc's thickness is the only obstruction to the fluid passing through the valve, resulting in minimal pressure drop across the valve. This makes them highly efficient for flow regulation. Butterfly valves come in two main types: soft-seated and metal-seated. Soft-seated valves use flexible materials, such as rubber or PTFE, which can be embedded in the body or attached around the disc. Metal-seated valves, on the other hand, are more durable and suitable for high-temperature applications, but they may not seal as tightly as their soft-seated counterparts.
If a butterfly valve is intended for flow control, it’s essential to select the correct size and type based on the application requirements. The design of a butterfly valve makes it particularly well-suited for large diameter installations. These valves are widely used in various industries, including oil, gas, chemicals, and water treatment, as well as in cooling water systems of thermal power plants.
Common types of butterfly valves include wafer-type and flanged-type. A wafer-style butterfly valve is installed between two pipe flanges using double-headed bolts, while a flanged butterfly valve has its own flange that connects to the pipeline flanges via bolts on both sides. This versatility allows them to be easily integrated into different piping systems.
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