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Valve can be used for most of the media flow systems. Has been developed to meet the petrochemical, electric power, metallurgy, urban construction, chemical and other departments for various uses of the various forms of cut-off valve. The use of cut-off valve is very common, but a larger opening and closing moments, the structure length is longer, usually nominal 250mm diameter are limited to the following, but also to 400mm, but special attention when used import and export Fang Xiang. The following general 15Omm Most medium closing valve below the inflow from the disc, but 2O0mm valve above most medium flows from the top of the valve flap. This is because the torque caused by the closure of the valve. In order to reduce the torque on or off, the general 2O0mm more bypass valves are located inside or outside the bypass valve. The most obvious advantage of cut-off valve is: (L) in the opening and closing process, because the valve flap and valve sealing surface friction forces between the gate is small, and therefore wear. (2) generally only open seat height channel diameter l / 4, so much smaller than the gate. (3) in the valve body and disc are usually only one sealing surface, and thus comparison of manufacturing processes, and easy maintenance. However, the cut-off valve defects can not be ignored. The disadvantages are relatively large flow resistance coefficient, the resulting pressure loss, especially in the hydraulic device, this pressure loss is particularly evident.