Pressure-compensated, subsea chemical injection valve
US7520291B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 2006 |
| Grant date | Apr 21, 2009 |
| Priority date | — |
| Expiry date | Aug 16, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7792
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A backpressure-protected valve suitable for subsea well treatment chemical injection applications includes an improved gate valve, a check valve and a pressure compensator responsive to ambient hydrostatic pressure. The check valve may comprise a poppet valve in a detachable outlet body. The pressure compensator comprises a free piston in a cylinder. The portion of the cylinder on one side of the piston is exposed to seawater whereas the portion of the cylinder on the opposing side of the piston is filled with a selected hydraulic fluid. In this way the valve actuator is not exposed to the corrosive and/or contaminating effects of seawater.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.