Dual stage filter element bypass valve
US6818122B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 2002 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | Aug 23, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7976
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A replaceable cartridge type dual stage bypass valve is used in dual filter multi-media filtration assemblies. The cartridge may be selected and easily replaced to meet the various combinations and requirements of the dual filter elements (primary and secondary). The individual bypass valves that form the dual stage bypass valve may each be responsive to a predetermined increase of pressure due to a clogged filter condition. The individual bypass valves may use replaceable coil springs. The spring force of the coil spring is determined by the pressure differential to be resisted, i.e., the resistance to be offered by the spring action of the spring, and the flow capacity at a given pressure differential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.