The structure and application of the center line butterfly valve have the following points: 1. Adopt two-section valve stem without pin connection, simple and compact structure, extremely convenient for maintenance and disassembly (on-site disassembly);
The structure and application of the center line butterfly valve have the following points: 1. Adopt two-section valve stem without pin connection, simple and compact structure, extremely convenient for maintenance and disassembly (on-site disassembly); 2. Butterfly plate with automatic centering function (up and down, left and right), to achieve the butterfly plate and valve seat small interference fit. 2. The center line butterfly valve adopts the tongue-and-groove valve seat, which can ensure the accurate connection between the valve body, the valve seat and the butterfly plate and facilitate the replacement of the valve seat. 3, the center line butterfly valve USES the world's advanced spherical sealing pair, sealing more reliable. Due to the spherical seal, the valve is smooth when open and close, so reduce friction, reduce torque, can choose a small power drive device, thus reducing the cost of users. It also improves the service life of the seat (3-4 times of the normal center line butterfly valve). 4. The sealing surface of valve seat flange adopts the structure of large wide side and large arc, so that the valve can completely adapt to the requirements of sleeve type or welded type flange connection, suitable for connection with any standard flange. 5, the center line butterfly valve stem axial positioning device, using two gaskets plus a pair of open ring and spring clip structure. This also effectively prevents the stem from being unintentionally removed, and at the same time can bear a certain amount of axial force, to prevent the weight of the stem transferred to the disc. 6, the valve stem seal ring has a two-way sealing effect, that is, to prevent the invasion of foreign substances, at the same time to prevent the outflow of media. 7. The shaft sleeve can not only support the stem, but also reduce the opening and closing torque. At present, there are two kinds of bushing available for users to choose, namely: lubrication bronze, polytetrafluoroethylene.8, because the center line butterfly valve body itself replaces the backrest of the common seat, increased the overall strength of the valve, so that it can achieve the common line butterfly valve cannot achieve 20 kg of nominal pressure.