Check valve assembly for corrosive fluids
US4945945A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1989 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Nov 30, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7912
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A high pressure check valve assembly includes a ceramic cage loosely fitted into the bore of a body so as to leave at least a partial clearance between the cage and the body. A passage through the cage includes a retaining section adjacent a fluid inlet end for loosely containing a ball and an irregular cross-section adjacent the retaining section so as to obstruct the ball without hindering fluid flow forwardly through the passage. The cage further has a lateral bleed hole between the passage and the clearance to equalize fluid pressure. An outlet-end sealing member is press fitted into the bore against the outlet end of the cage. An oversized resilient washer-shaped inlet-end sealing member is press fitted into the bore against the inlet end of the cage to seal and retain the assembly. This member has a central aperture with a washer shaped seat member fitted therein, the seat member functioning with the ball as the check valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.