Pressure relief valve for roller bit
US4865136A · kind A · utility
19Cited by
13References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 5, 1987 |
| Grant date | Sep 12, 1989 |
| Priority date | — |
| Expiry date | Oct 5, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7938
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A one-way pressure relief valve assembly is provided for venting the lubricant reservoir of a roller-type well drilling bit. The valve assembly is mounted in the cap of the lubricant reservoir, to open outwardly, and is adapted to provide hydrostatic loading of the valve element to its closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.