| 主权项 |
1. An expansion joint for interconnecting two ducts, comprising a cylindrical inner sleeve, and an annular stainless steel dynamic flange that is of a two-step shape, wherein said dynamic flange is located adjacent and perpendicular to an outside surface of said cylindrical inner sleeve, said dynamic flange comprising a first annular bent step and a second annular bent step, wherein said first annular bent step is welded on one end to a first end of said second annular bent step, and said second annular bent step is welded on a second end to said outer surface of said inner sleeve, such that said first and said second annular bent steps each has a wall that is parallel to said cylindrical inner sleeve and a second wall that is perpendicular to said cylindrical inner sleeve, wherein the ratio of the length of said parallel wall of said first or second annular bent step to the length of said perpendicular wall of said first or second bent annular step is about 1.5:1 to 1:2. |
