Reinforced seal unit for pumpdown pistons or well swabs
US4227573A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1978 |
| Grant date | Oct 14, 1980 |
| Priority date | — |
| Expiry date | Nov 16, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/3284
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A piston for use as a TFL locomotive or well swab having a seal unit forming a fluid seal between the piston and the inner wall of a flow conductor or tubing string. The seal unit comprising at least one annular fin or lip extending radially from the piston. The annular fin or lip having an exterior portion formed from elastomeric material which is deformable to seal with the flow conductor and an interior portion formed from elastomeric material molded on wire mesh. The interior portion providing increased wear resistance and strength for the annular lip. In one version, the piston carries several individual seal units each having an annular lip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.