Patent ID: 6719272
Filing Date: 2004-04-13
Classification: F16K

Abstract:
A vacuum gate valve comprising:a valve main body having an opening and forming a space into which a gas is allowed to flow via the opening or other gas supplying opening, an inside of which is evacuated; a first valve member, provided in the valve main body, for opening/closing the opening; and a drive mechanism, provided outside the valve main body, for moving the first valve member between a close position where the opening is closed and an open position where the opening is opened, wherein the drive mechanism has a rod to be reciprocated, an end of the rod extends into the valve main body through a through hole formed in the valve main body to be connected to the first valve member, the first valve member is moved between the close position and the open position as the rod is reciprocated, and said vacuum gate valve further comprising: a sealing mechanism, which communicates into the valve main body via the through hole, for isolating the drive mechanism side air-tightly from the valve main body; and a second valve member, provided on the rod to move together with the rod as it is reciprocated, which closes the through hole when the first valve member is situated at the open or close position so as to prevent the gas within the valve main body from contacting the sealing mechanism while maintaining the degree of vacuum within the valve main body.