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mud gate valves are primarily applied to mud circulating system devices in oil wells, which controls the circulation of mud. The connection type is trapezoidal threaded, which leads to quick and easy installation, strong rigidity as well as safe and reliable property. Parallel elastic seal is used for valve seat and gate, which makes sealing effect perfect and open easily. Both ends of valve are connected to pipeline hermetically, with spherical movable contact adopted. The movable connector, which is connected to “O”-rubber seal ring, doesn’t have a high demand on the straightness of pipe ends during installation and sealing property is still good.