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Plug the opening and closing member is a perforated cylinder, cylinder and stem around the axis of rotation perpendicular to the channel, so as to achieve the purpose of opening and closing channels. Mainly for the opening and closing of pipelines and equipment media. Plug the main advantages are as follows: For regular operation, opening and closing fast, lightweight. Small fluid resistance. Simple structure, relative size, light weight, easy maintenance. Sealing performance, regardless of the direction of installation restrictions, the flow of media can be arbitrary. No vibration, low noise.