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 functins in a single valve. This minimizes expense, maintenance, service, and risk of leaks as compared to multiple 6 port valve systems.

See applications sorted by number of ports in the valve.

Applications, listed alphabetically

Title Valve
Alternate column regeneration 10 port
Backflush of precolumn to vent 6 port
Detector selection from two columns, or one column and auxiliary carrier 4 port
Dual microvolume sample injection 6 port
Heart cut trapped in a loop and injected onto a second column 10 port
Loop sampling with backflush of precolumn to vent 10 port
Loop sampling with backflush to detector 8 port
Loop sampling with two column sequence reversal 10 port
Microvolume sample injection (Valco and Cheminert valves) 4 port
Same sample to different loops 8 port
Sample enrichment (cleanup) using dual precolumns 10 port
Sample injection 6 port
Sample injection and heart cut to detector 10 port
Sample injection, end and heart cut to column 2, front cut to detector 10 port
Simultaneous injection of the same sample onto two separate columns 10 port
Simultaneous injection of the same sample onto three separate columns 14 port
Two column selection 6 port
Two different samples to same column 10 port
Two different samples to two columns 12 port

Applications, listed by number of ports

4 ports
Detector selection from two columns, or one column and auxiliary carrier
Microvolume sample injection (Valco and Cheminert valves)
6 ports
Backflush of precolumn to vent
Dual microvolume sample injection
Sample injection
Two column selection
8 ports
Loop sampling with backflush to detector
Same sample to different loops
10 ports
Alternate column regeneration
Heart cut trapped in a loop and injected onto a second column
Loop sampling with backflush of precolumn to vent
Loop sampling with two column sequence reversal
Sample enrichment (cleanup) using dual precolumns
Sample injection and heart cut to detector
Sample injection, end and heart cut to column 2, front cut to detector
Simultaneous injection of the same sample onto two separate columns
Two different samples to same column
12 and 14 port
Two different samples to two columns (12 ports)
Simultaneous injection of the same sample onto three separate columns (14 ports)
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