| 摘要 |
A pig for conveying a working medium inside a feed line comprises a pig b ody (12) which can be driven inside the feed line by a pushing medium and wh ich has on one front side (18) a projection (34) with a free front surface ( 36). The pig also contains at least one first and one second circumferential sealing element (38, 44) arranged on the pig body (12) which are made of el astomeric material and which are at a distance from each other in the direct ion of the longitudinal axis (14) of the pig body (12) and which run coaxial to the longitudinal axis (14) of the pig body (12). The sealing elements (3 8, 44) can be pressed against the inner wall of the feed line, in that the w orking medium or the pushing medium bears against a contact surface (22, 32, 30; 24, 42, 72) of the respective sealing element (38, 44). The contact sur face (22, 32, 30) of the sealing element (38) neighboring the front side (18 ) with the projection (34) is smaller than the contact surface (24, 42, 72) of the other sealing element (44). |
