Valve Applications – Valco Two Position Injectors and Valves

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 | YouTube

Applications, listed by number of ports