Valve body drive device, gate valve

Abstract

The objective of this invention is to prevent the generation of particulate matter in a sealing member during torsion. The solution is a valve body drive device 10, comprising: a first moving member 11, which is movable in a parallel direction between a starting point A1 and an ending point A3 set on a virtual first straight line extending along a first direction; a second moving member 12 disposed on the first moving member 11 and movable together with the first moving member 11 between a starting point A1 and a stopping point A2; and a third moving member 13 disposed on the second moving member 12 and movable together with the first moving member 11. The first moving member 11 and the second moving member 12 move together between the starting point A1 and the stopping point A2, and at the same time, corresponding to the movement of the first moving member 11 between the stopping point A2 and the ending point A3, they can move in a parallel direction between the initial point B1 and the protruding point B2, which are set on a virtual second straight line extending along a second direction that is approximately perpendicular to the first direction; and the valve body 14, which is fixedly mounted on the third moving member 13, can open and close any opening.

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