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The main characteristics of the gearbox flange butterfly valve are excellent bi-directional sealing performance, low torque value, and superior part processing performance. The flow characteristics tend to be linear, and the regulation performance is good. The flange connection is easy to install, and can be installed in both vertical and horizontal positions. The valve can be used as a vent valve at the pipe end, with reliable performance. The valve seat sealing ring is organically combined with the valve body to provide a longer service life for the valve. Strong anti erosion performance, suitable for harsh working conditions. Can be used for medium truncation and regulation.