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The mud gate valve is used mainly for the drilling mud circulation system equipment and to control flowing and closing of mud. The connection mode of the valve is acme thread connection, which is characterized by quick and convenient installation, strong rigidity, safety and reliability. The valve seat and the gate segment use parallel elastic seals of good sealing effect, so that the valve is opened easily. The connection of the two ends of the valve with a pipeline is sealed and the spherical active contact mode is adopted. The flexible joint connected with “O”-rubber seal rings has low requirements for the linearity of the two ends of the pipeline during installation and good sealing property.