Filter screen with backflush
US5579790A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1995 |
| Grant date | Dec 3, 1996 |
| Priority date | — |
| Expiry date | Apr 12, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D29/668
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter screen assembly is provided which includes a housing, a filter screen, and two valve or check balls. The housing has two interior walls, each having openings therein which divide an interior space of the housing into top, center, and bottom chambers. A first inlet and a first outlet open into the top chamber and a second inlet and a second outlet open into the bottom chamber. The filter screen is horizontally disposed within the center chamber. One check ball is located in the top chamber and is biased to close the first inlet by a bottom inclined surface of the top chamber. The check ball is forced to substantially close the first outlet when fluid flows in the first inlet. The other check ball is located in the bottom chamber and is biased to close the second inlet by a bottom inclined surface of the bottom chamber. The check ball is forced to substantially close the second outlet when fluid flows in the second inlet. The filter screen thereby filters fluid entering the first inlet and exiting the second outlet and is automatically cleaned or backflushed by fluid entering the second inlet and exiting the first outlet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.