CLEANING PISTON WITH IMPROVED EFFECT OF PACKING Russian patent published in 2011 - IPC F16L55/38 B08B9/55 

FIELD: machine building.

SUBSTANCE: invention refers to cleaning piston for transfer of working medium inside of supplying pipeline with case (12) of cleaning piston (5). The piston is actuated into motion inside the supplying pipeline with moving medium. On end side (18) it has lug (34) with free end surface (36). Additionally, the cleaning piston has at least one first and one second elements located on case (12) of the cleaning piston enveloped with packing elements. Elements (38, 44) of elastomer material are positioned in the direction of lengthwise axis (14) of case (12) of the cleaning piston at a distance from each other and they pass coaxially to lengthwise axis (14) of case (12) of the cleaning piston. Packing elements (38, 44) are pressed to an internal wall of the supplying pipeline because working medium 15 or moving medium applies force to working surface (22, 32, 30, 24, 42, 72) of corresponding packing element (38, 44). Working surface (22, 32, 30) of packing element (38) adjacent with end surface (18) with lug (34) is less, than working surface (24, 42, 72) of another packing element (44).

EFFECT: upgraded quality of pipeline cleaning.

18 cl, 3 dwg