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The disc of a metal hard-seal butterfly valve is positioned along the diameter of the pipe. Within the cylindrical passage of the valve body, the disc rotates around its axis, with a rotation angle ranging from 0° to 90°. When fully opened at 90°, the valve allows maximum flow through the pipeline.
Metal hard-seal butterfly valves are now widely used in various industries such as oil and gas, chemical processing, metallurgy, and hydropower. They serve as essential components for controlling the on-off function and regulating the flow within pipeline systems.
In traditional butterfly valve designs, sealing is typically achieved using materials like rubber or PTFE (polytetrafluoroethylene). However, due to structural limitations, these types of valves are not ideal for applications requiring high temperature resistance, high pressure tolerance, corrosion resistance, or wear resistance.
A more advanced design is the three-eccentric metal hard-seal butterfly valve. This type features a valve body and seat that are connected as separate components. The sealing surface of the seat is often made by welding a high-temperature and corrosion-resistant alloy. Additionally, a multi-layer soft-seal ring is fixed onto the disc. Compared to conventional butterfly valves, this design offers superior performance, including high-temperature resistance, smooth operation, and minimal friction during opening and closing. Moreover, the sealing force is enhanced as the torque increases when the valve is closed, resulting in improved sealing performance and a longer service life.
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Structure and problems of new metal hard seal butterfly valves