Patent ID: 7100892

Claim:
A non-rubbing gate valve for a semiconductor fabrication apparatus, said gate valve comprising: a valve main body having a gate valve body attached to a valve rod; a movement operation mechanism that moves the valve rod in a direction along an axis of the rod up to a first position where the gate valve body stops up a flow passage port used for carrying in and out objects; a rotating motion mechanism for rotating the valve rod, which has been moved to the first position, by a predetermined angle; a horizontal drive gear for moving the gate valve body in a direction orthogonal to the direction of movement of the valve rod to seal the flow passage port, wherein the movement operation mechanism includes a cylinder disposed in the valve main body for enabling the valve rod to be movable, wherein the rotating motion mechanism comprises a screw of a lead angle of about 45 degrees provided at the valve rod and a change nut for enabling the valve rod to be rotatable after being moved to the first position, and wherein the horizontal drive gear mechanism comprises an eccentric cam provided at an upper end of the valve rod located in the gate valve body and capable of rotating to move the gate valve body in the direction orthogonal to the direction of movement of the valve rod.