Air-injection cleaning system for liquid filters
US4219423A · kind A · utility
18Cited by
10References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1978 |
| Grant date | Aug 26, 1980 |
| Priority date | — |
| Expiry date | Sep 27, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S261/75
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A pump and filter assembly suitable for circulating and filtering swimming-pool water is provided with a normally closed air-injection valve to aerate water flowing into a filtration element in the filter. When the exterior surfaces of the element become covered with dirt or filter cake, the air-injection valve and an auxiliary filter outlet are opened. Air aspirated through the valve into the filter inlet water stream causes a churning cleaning action which dislodges the dirt, and the debris-laden water is discharged through the auxiliary outlet without passing through the element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.