Self-boosting, non-elastomeric resilient seal for check valve
US8763706B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 15, 2011 |
| Grant date | Jul 1, 2014 |
| Priority date | — |
| Expiry date | Jul 14, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7837
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A check valve for gas lift applications can be attached externally to a side pocket mandrel or can be a gas lift valve used in the mandrel. The valve has a seat with a non-elastomeric element and a metal element. A biasing element resiliently biases the non-elastomeric element to provide resiliency to the seal produced. A metal dart moves in the bore relative to the seat and allows or prevents flow through the valve body. When exposed to a first differential pressure, the dart engages the non-elastomeric element resiliently biased by the biasing element. When exposed to a greater differential pressure, the dart engages the metal element, which can be part of the valve in the bore. In one arrangement, the non-elastomeric element can be a thermoplastic component with a metal spring energized seal as the biasing element. Alternatively, the non-elastomeric element can be the jacket of metal spring energized seal with a coil spring as the biasing element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.