| 摘要 |
Provided is a gate valve wherein the deterioration of a seal member due to radicals can be suppressed, and the seal member can be prevented from coming off a dovetail groove. A seal groove for attaching a seal member is formed by a first groove portion that has a rectangular cross-section and a second groove portion that is provided in the bottom wall of the first groove portion and that has a dovetail groove-like cross-section. The seal member is held in the second groove portion with part thereof protruding to the first groove portion. A valve seat inserted into and pulled out of the seal groove to be brought into and out of contact with the seal member protrudes from the inner surface of a partition wall in which a gate opening is provided. |
