Patent ID: 9482350
Filing Date: 2016-11-01
CPC Classification: F16K

Claim Text:
1. A radical-resistant gate valve comprising: a gate opening provided in a partition wall in order to connect to a process chamber; a valve plate coming into and out of contact with the gate opening in order to open and close the gate opening; and a valve seat formed around the gate opening in the partition wall, the valve plate including a valve plate body having a seal groove at a position corresponding to the valve seat and a seal member attached in the seal groove, wherein the seal groove is formed by a first groove portion that opens on a seal surface of the valve plate body opposed to the gate opening and that has a groove width that is uniform in a depth direction, and a dovetail groove-like second groove portion that opens substantially in a center of a bottom wall of the first groove portion and that has an opening width smaller than the groove width of the first groove portion, wherein the seal member has a width larger than the opening width of the second groove portion and a thickness larger than a depth of the second groove portion, and is attached in the second groove portion in a state that a part of the seal member protrudes into the first groove portion, wherein the valve seat is protruded from an inner surface of the partition wall toward a direction of the valve plate, has at a distal end thereof a valve seat surface with which the seal member is brought into and out of contact, and has a width smaller than an opening width of the seal groove, and wherein when the valve plate is at a hermetically closing position of the gate opening, a distal end part of the valve seat is inserted in the seal groove, and the valve seat surface hermetically abuts against the seal member in the seal groove.