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Drainage gate valve overview: Fast discharge gate valve opening and closing principle is the use of gear to 90 ℃ driven stem lift to achieve the purpose of opening and closing. Rapid discharge valve is not only simple structure, good sealing, and small size, light weight, less material consumption, small installation size, especially the driving torque is small, easy to operate, easy to achieve quick opening and closing. Sewage gate structure of the valve principle: Rapid discharge gate valve is directly dependent on the media pressure generated force to help act on the valve flap on the mechanical seal, the role of the mechanical load on the valve flap is mainly from the compression spring, this is almost fixed Mechanical load. Although, for compression springs, a loaded blowdown valve can achieve a good seal by adjusting the spring force, the seal differential pressure must be strong enough to ensure sufficient sealing force to seal the valve during normal operation. Seal differential pressure should be less than the opening and closing pressure to ensure open flexible.