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Gate valve is a gate with opening and closing parts. The movement direction of the gate is perpendicular to the flow direction. The gate valve can only be fully opened and fully closed, and can not be adjusted and throttled. The gate valve is sealed by the contact between the valve seat and the gate. Usually, the sealing surface is overlaid with metal materials to increase the wear resistance, such as surfacing 1Cr13, stl6, stainless steel, etc. The gate has rigid gate and elastic gate. According to the different gate, gate valve is divided into rigid gate valve and elastic gate valve.
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