Urea depollution circuit comprising a double-seat valve selectively ensuring the degassing or the recirculation of the aqueous urea solution
US10415449B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2017 |
| Grant date | Sep 17, 2019 |
| Priority date | — |
| Expiry date | Nov 13, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention concerns a circuit intended to transfer, by means of a pump, first fluid, such as an aqueous urea solution, from a reservoir to an injector, said circuit also containing a second fluid, such as air, and said circuit comprising, downstream of the pump and of the reservoir, a downstream circuit portion which includes, on the one hand, a main branch which leads to the injector and, on the other hand, bypass branch which returns to the reservoir and which is provided with a double-seat valve designed to selectively and automatically adopt: purge configuration allowing to purge the second fluid through the valve out of the main branch, a pressurized supply configuration allowing to direct the first fluid to the injector under a predetermined working pressure, and a recirculation configuration allowing a recirculation through the bypass branch, and to the reservoir, of the first fluid coming from said reservoir.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.