Subsea gate valve actuator with external manual override and drift adjustment
US4650151A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 1985 |
| Grant date | Mar 17, 1987 |
| Priority date | — |
| Expiry date | Jun 18, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/402
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hydraulically operated actuator for a sliding gate valve designed for use in a subsea environment. The actuator includes a manual override system that functions independently of the actuator's hydraulic piston and return spring, an externally accessible valve gate drift adjustment, an externally adjustable upstop for the actuator stem, a stem thread assembly that can be manufactured from a material different from the actuator stem to prevent or reduce the possibility of thread galling, a hydraulic control pressure porting system integral with the hydraulic cylinder to minimize space requirements, and a facility for accommodating an optional external electrical stem position indicator package.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.