Multiple piston assembly for safety valve
US9631456B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2013 |
| Grant date | Apr 25, 2017 |
| Priority date | — |
| Expiry date | Aug 20, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A safety valve includes a housing defining first and secondary piston bores in fluid communication with each other via a port. A first piston is movably arranged within the first piston bore and has a first piston rod extending longitudinally from the first piston and coupled to a flow tube. A second piston is movably arranged within the secondary piston bore and has a secondary piston rod extending longitudinally from the second piston and axially engageable with the flow tube. Hydraulic fluid pressure acts on the first piston until the first piston axially moves and exposes the port, whereby the hydraulic fluid pressure is then able to enter the secondary piston bore and also act on the second piston.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.