Multiport valve system through which sample gas continuously flows in selected and non selected ports
US6067864A · kind A · utility
Inventor
Key dates
| Filing date | Nov 25, 1997 |
| Grant date | May 30, 2000 |
| Priority date | — |
| Expiry date | Nov 25, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86558
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A multiport valve system is disclosed in which sample gas continuously flows through all ports. More specifically, gas flowing to a specific port is selected for analysis, and gas continuously flows through the valve at this port during the analysis. In addition, non selected gas samples, which are defined as gas samples not currently being analyzed, continuously flow through non selected ports thereby always providing fresh samples at these ports when they subsequently become selected ports for analysis. Non selected gas is purged from the valve as waste. A positive pressure is maintain between portions of the valve containing selected gas and portions of the valve containing non selected gas to prevent contamination of the selected gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.