These illustrations show basic sample injection techniques using Valco two position valves. With rare exceptions, there is no difference between switching valves and external volume sampling valves, so the same valve can be used for either function.
The unique advantage of 8 and 10 port valves is that they reduce extra column volume by combining sampling and switching functions in a single valve. This minimizes expense, maintenance, service, and risk of leaks as compared to multiple 6 port valve systems.
Format descriptions
- Static: side-by-side view of valve in each position, much like in our print catalog
- JavaScript: one position is shown at a time, with the position changed by a mouse click
- YouTube: animated version delivered by YouTube
See applications sorted by number of ports in the valve.
Applications, listed alphabetically
| Title | Valve | Format |
|---|---|---|
| Alternate column regeneration | 10 port | Static | JavaScript | YouTube |
| Backflush of precolumn to vent | 6 port | Static | JavaScript | YouTube |
| Detector selection from two columns, or one column and auxiliary carrier | 4 port | Static | JavaScript | YouTube |
| Dual microvolume sample injection | 6 port | Static | JavaScript | YouTube |
| Heart cut trapped in a loop and injected onto a second column | 10 port | Static | JavaScript | YouTube |
| Loop sampling with backflush of precolumn to vent | 10 port | Static | JavaScript | YouTube |
| Loop sampling with backflush to detector | 8 port | Static | JavaScript | YouTube |
| Loop sampling with two column sequence reversal | 10 port | Static | JavaScript | YouTube |
| Microvolume sample injection | 4 port | Static | JavaScript | YouTube |
| Same sample to different loops | 8 port | Static | JavaScript | YouTube |
| Sample enrichment (cleanup) using dual precolumns | 10 port | Static | JavaScript | YouTube |
| Sample injection | 6 port | Static | JavaScript | YouTube |
| Sample injection and heart cut to detector | 10 port | Static | JavaScript | YouTube |
| Simultaneous injection of the same sample onto two separate columns | 10 port | Static | JavaScript | YouTube |
| Simultaneous injection of the same sample onto three separate columns | 14 port | Static | JavaScript | YouTube |
| Two column selection | 6 port | Static | JavaScript | YouTube |
| Two different samples to same column | 10 port | Static | JavaScript | YouTube |
| Two different samples to two columns | 12 port | Static | JavaScript |
