| 摘要 |
<p>A device (3) inserted through a tubular wall (1) by means of a cylindrical flange (11) surrounding a through-bore (6) which is used to insert a tool for flaving the annular region (15) defined by the flange around the bore on the inside of said wall (1), so that the device may be mechanically secured thereto. The bore (6) is then plugged with a disc (17) and the whole assembly is sealed by brazing.</p> |
