Check valve
US6651693B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jul 9, 2002 |
| Grant date | Nov 25, 2003 |
| Priority date | — |
| Expiry date | Jul 9, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7867
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The check valve (12, 14) of the present invention is a ball-type valve that incorporates multiple annular valve seats (34, 38) of progressively smaller diameters for the specific purpose of providing a series of effective annular valve seats as the larger annular valve seats progressively deteriorate, and as the ball valve elements (24) wear away (decrease in diameter) from use, for example, as abrasive slurry is pumped through the check valves and through the fluid pump. Each of the annular valve seats (34, 38) comprises a flexible or otherwise deformable annular lip defined by a cylindrical section having an annular groove (36, 40) formed therein slightly outboard of the cylindrical section, such that the cylindrical section may deform slightly outwardly into the annular groove, thereby effecting an improved functional sealing engagement with the ball valve element (24) as the tip of the cylindrical section deforms outwardly into the annular groove.As abrasive slurry material is pumped through the fluid pump and through the check valve, the first annular valve seat (34) defined by the cylindrical section and first surrounding annular groove (36) deteriorates and the ball valve el…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.