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The soft-seal telescopic butterfly valve combines the functions of a flanged butterfly valve and a pipe expansion joint; it can serve both to regulate flow rate and to eliminate the internal forces generated by temperature differences, thus performing an expansion/contraction function. As a component used to control the on/off status and flow rate of pipeline systems, it has been widely applied in many fields such as petroleum, chemicals, metallurgy, and hydropower. Structural features of soft-seal telescopic butterfly valves: 1. They are compact and lightweight, easy to disassemble, assemble, and maintain, and can be installed in any position. 2. It features a simple and compact structure, low operating torque, and rapid 90-degree rotation for opening. 3. The flow characteristic is linear, resulting in good regulation performance. 4. The connection between the butterfly plate and the valve stem uses a pinless design, eliminating potential points of internal leakage. 5. The seal can be replaced, and it provides reliable sealing with bidirectional sealing capability. 6. The butterfly valve can be coated with a layer as per the user’s requirements, such as nylon or PTFE. 7. This valve can be designed with flange connection and clamp connection. 8. The drive method can be manual, electric, or pneumatic. Precautions for installing soft-sealed telescopic butterfly valves: 1. They must be placed flat before installation; avoid any accidental impacts, and the brackets must not be removed during operation ； 2. The telescopic butterfly valve comes out of the factory with its structure at the minimum length; during installation, it is extended to the installation length (i.e., the design length) ； 3. Before installation, it is necessary to loosen the gasket cover at the telescopic section; once the soft-sealed telescopic butterfly valve has reached the desired length relative to the pipeline, then the telescopic seal cover should be tightened ； 4. When the distance between pipes exceeds the installation length of the expansion valve, adjust the spacing between the pipes; do not force the expansion butterfly valve, as this may damage it ； 5. It can be installed in any location; when used for temperature compensation, brackets must be installed at both ends along the axis of the pipeline after the pipeline has been installed, to prevent the expansion/contraction tube of the expansion valve from being pulled out.