Patent ID: 8800956

Claim:
A non-sliding gate valve including: a valve plate stored in a valve box having an opening; a valve seal mounted on the valve plate; a valve shaft coupled to the valve plate; an air cylinder having a drive rod coupled to the valve shaft, the gate valve being configured to move from a fully-open position where the valve plate does not oppose the opening through an opposed position where the valve plate opposes the opening to a closed position where the valve plate closes the opening by pressing the valve seal to a valve seat surface around the opening by moving the valve shaft by the air cylinder, comprising: a coupling mechanism configured to couple the drive rod and the valve shaft so as to be displaceable with respect to each other; a parallel movement mechanism configured to move the valve plate and the valve shaft from the fully-open position to the opposed position in parallel to the valve seat surface; and a vertical movement mechanism configured to move the valve plate and the valve shaft from the opposed position to the closed position vertically with respect to the valve seat surface, wherein the coupling mechanism includes: a rod arm fixed to the drive rod; a lever member fixed to the valve shaft; and a compression spring interposed between the lever member and the rod arm, wherein the parallel movement mechanism includes: a pair of left and right cam frames fixed to the rod arm so as to face a left side surface and a right side surface of the lever member respectively; guide grooves formed so as to be parallel to the valve seat surface on the cam frames respectively; and guide rollers mounted on a pair of left and right roller frames fixed to a bonnet on which the valve box is mounted and configured to fit the guide grooves, wherein the vertical movement mechanism includes: cam grooves formed respectively on the pair of cam frames in the direction inclined with respect to the valve seat surface; and cam rollers mounted respectively on the left side surface and the right side surface of the lever member and configured to fit the cam grooves.