Well pilot valve assembly
US4150687A · kind A · utility
3Cited by
6References
13Claims
0Family size
Inventor
Key dates
| Filing date | May 12, 1977 |
| Grant date | Apr 24, 1979 |
| Priority date | — |
| Expiry date | May 12, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86582
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Disclosed is a pilot valve assembly for preferred use in conjunction with pneumatically operated safety valves of a well head assembly, the pilot valve apparatus including an automatic trip assembly composed of a pair of bourdon tubes adapted to engage respective thumbwheels on a translatable stem; a seal carrier assembly responsively translated between first and second blocking and non-blocking positions between entrance and exit ports; a reset valve assembly for placing the pilot apparatus in its initial "untripped" position; and a manually operated trip valve assembly for independently translating the seal carrier assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.