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The gate body rotates around the Trunnion Pin installed horizontally, and its upper and lower parts are opened and closed. The circular skin plate is attached to the upstream face centered on the trunnion pin with the the main and auxiliary templates installed on the tip of the girder radially placed on the trunnion hub. As it supports the hydraulic load at one point, it has a relatively small opening/closing load caused by the hydraulic load and thus has a functional beauty made of a girder spread in a radial shape and a circular skin plate