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The centerline soft-sealed butterfly valve is the conventional butterfly valve of choice for pipelines, featuring a simple structure, a low flow resistance coefficient, linear flow characteristics, and no retention of debris. It also has the advantages of being lightweight, easy to install, and requiring less driving torque. This type of valve can be used both to shut off the medium and to regulate its flow rate. The drive mechanism can be manual, electric, pneumatic, or of another type as required by the user. By using components made of different materials along with seals made of various materials, it is possible to adapt to different media and operating conditions, thereby achieving an optimal balance between cost and performance. Soft-sealed butterfly valves are suitable for use in industries such as water supply and drainage, sewage treatment, food processing, heating systems, gas handling, shipbuilding, hydropower, metallurgy, and energy sectors, where the temperature is ≤120°C or ≤150°C and the nominal pressure is ≤1.6 MPa. They are particularly appropriate for applications requiring two-way sealing and in situations where the valve body is prone to rusting, serving to regulate flow rates and prevent the passage of fluids. The main features of the centerline soft-seal butterfly valve are: 1. It is 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° 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 outer surface of the butterfly plate is designed in a spherical shape, which improves the sealing performance and extends the service life of the valve; it can remain leak-free even after being opened and closed under pressure more than 50,000 times. 6. The seal can be replaced, and it provides reliable sealing with bidirectional sealing capability. 7. The butterfly valve can be coated with a layer as per the user’s requirements, such as nylon or PTFE. 8. This valve can be designed with flange connection and clamp connection. 9. The drive mode can be manual, electric, or pneumatic.