Multiple piston pressure intensifier for a safety valve
US9383029B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 25, 2013 |
| Grant date | Jul 5, 2016 |
| Priority date | — |
| Expiry date | Nov 6, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K17/18
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Disclosed are subsurface safety valves having multiple pistons used to increase the opening force. One safety valve includes a housing having a piston bore defined therein and configured to receive hydraulic fluid pressure, the piston bore providing an upper bore having a first diameter and a lower bore having a second diameter smaller than the first diameter, a piston assembly movably arranged within the piston bore and comprising an upper piston arranged in and configured to sealingly engage the upper bore and a lower piston arranged in and configured to sealingly engage the lower bore, and a connecting rod coupling the upper and lower pistons, wherein a cavity is defined between the upper and lower pistons within the piston bore and the piston rod extends within the cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.