GATE VALVE

摘要

To provide a gate valve such that two connected surfaces perpendicular to each other of a valve plate housing frame can be connected to two side walls perpendicular to each other of a chamber in such a manner that the connected surfaces are in contact with the side surfaces. When screwing a fixation screw perpendicularly into a screw hole formed in one chamber wall of a chamber through a screw insertion hole formed in one frame wall of a valve plate housing frame of a gate valve, and tightening the fixation screw to press and fix the frame wall against and to the first chamber wall, a thrust force in a direction perpendicular to the axis of the fixation screw is generated in the valve plate housing frame by a cam mechanism formed on the fixation screw and in the screw insertion hole, and the other frame wall of the valve plate housing frame is pressed against and fixed to the other chamber wall of the chamber by the thrust force.

主权项

1. A gate valve that is attached so as to straddle a first chamber wall and a second chamber wall connected perpendicularly to each other of a chamber and that opens and closes an opening formed in the first chamber wall with a valve plate,
the gate valve comprising: a valve plate housing frame having a first frame wall that is pressed against the first chamber wall and a second frame wall that is pressed against the second chamber wall; a communication opening that is formed in the first frame wall so as to communicate with the opening; the valve plate that is displaced in the valve plate housing frame and thereby opens and closes the communication opening; an operation mechanism portion that operates the opening and closing of the valve plate; and a fixing device for fixing the valve plate housing frame to the first chamber wall or the second chamber wall, wherein the fixing device includes a fixation screw that is screwed into a screw hole formed perpendicularly in one of the first chamber wall and the second chamber wall, and a screw insertion hole that is formed perpendicularly in one of the first frame wall and the second frame wall of the valve plate housing frame corresponding to the one chamber wall and through which the fixation screw is passed, a cam mechanism that generates a thrust force in a direction perpendicular to the axis of the fixation screw in the valve plate housing frame when tightening the fixation screw to press and fix the one frame wall against and to the one chamber wall is formed on the fixation screw and in the screw insertion hole, and the other frame wall of the valve plate housing frame is pressed against the other chamber wall of the chamber by the thrust force.