Hydraulic pig advance system comprising a control volume chamber containing hydraulic fluid and a force transmitting member
US7003838B2 · kind B2 · utility
2Cited by
12References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 2003 |
| Grant date | Feb 28, 2006 |
| Priority date | — |
| Expiry date | May 9, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B11/13
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
This invention relates to a hydraulic pig advance system comprising a control volume chamber containing hydraulic fluid and a force transmitting member. The system further comprises two directional control valves which can be selectively repositioned to cause hydraulic fluid to cycle the force transmitting member back and force such that in each cycle, a metered amount of hydraulic is transmitted into a pig housing where it causes a pig to move a predetermined distance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.