| 摘要 |
The arrangement is fitted coaxially with and within the assembly flange, and has an outer limiting surface (20) congruent with the inner limiting surface of the flange. It is so adjusted that, in the assembled position, the distance between the limiting surfaces is less than the thickness of the mat (2). The part supporting the strainer (15) is at such a height that the strainer is located at the height of or somewhat below the uppermost edge of the assembly flange and the connecting mat. |
