Patent ID: 8448917
Filing Date: 2013-05-28
Classification: F16K,H01L,Y10T

Abstract:
1. A vacuum gate valve, comprising a main body that has an exhaust passage barrel provided with an exhaust port at the end thereof, a gating-member retreat accommodation that has a gating-member retreat room, a gating-member that moves from said gating-member retreat room to said exhaust passage barrel so as to shut said exhaust port and so as to be accommodated in said gating-member retreat room, a gating-member driver for moving said gating-member, a shutter provided movably along said exhaust passage barrel in a shuttering movement room, and a shutter driver that moves said shutter, wherein said main body has an entrance aperture of said gating-member retreat room that communicates with said exhaust port thereon formed facing the lateral side of said exhaust passage barrel; said shutter shuts said entrance aperture of said gating member retreat room at the time when said gating-member shuts said exhaust port and when said gating-member moves into said gating-member retreat room for retreat; said shutter has a shutter-ring having a shutter sealing that is touchable with a stationary seal provided on a fitting seat formed on said exhaust port, and is accommodated in a shutter accommodation room located on the lateral side of said exhaust passage barrel, and is formed in a cylindrical shape that permits its lengthwise movement, and is installed so as to confront said stationary seal; said gating-member is made movable in said shuttering movement room located between said gating-member retreat room and said exhaust passage barrel; a first gate seal is formed on one side of said gating-member confronting said stationary seal; and a second gate seal is formed on the opposite side of said first gate seal confronting said shutter sealing; wherein said shutter is moved lengthwise said exhaust passage barrel; said gating-member is accommodated in said gating-member retreat room; said shutter sealing is made to contact with said stationary seal being caused by said shutter-ring being moved; and thereby said shutter establishes, on said exhaust passage barrel side of said shutter-ring, the shutting of said entrance aperture of said gating-member retreat room; further wherein said gating member is moved from said gating-member retreat room to said exhaust passage barrel; said first gate seal is made to contact with said stationary seal to shut said exhaust port; said shutter-ring is moved; said shutter sealing is made to contact with said second gate seal; and thereby said shutter establishes shutting said entrance aperture of said gating-member retreat room; said shutter accommodation room has a cylindrical cover on the inner periphery thereof; a shutter driving piston of said shutter driver is provided on a lateral side of said shutter accommodation room; said shutter driving piston is connected to said shutter ring; said shutter is movable along said exhaust passage barrel in a non-contact state with said shutter accommodation room by said shutter driving piston that operates along said exhaust passage barrel.