Water purification system
US4909934A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 1988 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | May 18, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D61/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
"A water purification system has a reverse osmosis filtration unit which receives feed water from a feed water valve and separates it into product water and waste water. A reservoir has a movable separator dividing it into a product water chamber for receiving the product water and a control water chamber. The product water is delivered to an outlet connection from the product water chamber or directly from the filtration unit. A regulator is connected to the waste water outlet port of the filtration unit, the control water port of the reservoir, and a drain line. The regulator has a first valve for providing waste water from the filtration unit to the control water port of the reservoir for urging the separator toward the product water chamber. The regulator has a second valve that can rapidly drain water from the control water chamber of the reservoir and rapidly reduce pressure in the control water chamber, thus facilitating the refilling of the product water chamber. A relief valve downstream of the second valve maintains a low pressure in the system to avoid undesirable cycling of the system between high pressure and low pressure."
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.