Hydraulic safety stop-valve
US3999574A · kind A · utility
3Cited by
7References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 25, 1974 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | Nov 25, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86936
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hydraulic safety stop-valve fitted with hermetic sealing means. The equalization passage between pressures above and below the stop-valve comprises two means of sealing, one provided by contact between two truncated conical bearing surfaces on the outer casing and inner tube, and the other consisting of valves, held by springs against the equalization passage inlet apertures, bored in the lower tubular element of the outer casing, and the opening of which is controlled by a truncated conical surface on the inner tube. This device ensures a high level of safety in stop-valves used in large production tubings for wells at sea.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.