| 摘要 |
Bi-directional pig for a liquid-distribution piping, comprising a long body (4, 4') and two abrasive segments (2, 3) fore and aft of a central depressed portion having a concave external surface. The long body (4, 4') is made up of two complementary pieces (5, 6; 5', 6') joined together by a nut (7, 7') attached to one of the pieces and a screw (8, 8') engaged in the other of the pieces, the abrasive segments (2, 3) being removably fitted about a central portion (4B) of this body, axially between two end portions. …<IMAGE>… |
