Mud gate valves are mainly used in oil drilling mud circulation system equipment to control mud circulation and closure. The connection method of mud gate valve is trapezoidal thread or flange type. Quick and convenient installation, strong rigidity, reliable performance, good sealing performance between valve seat and gate, and convenient opening and closing. The valve is connected to the pipeline on both sides for sealing, and a movable joint that matches the spherical moving contact and 0-type rubber sealing ring is selected.