Sample enrichment (cleanup) using dual precolumns

Two position valve application – 10 port valve
(Non-Java)

Sample is injected by a separate injector onto one of two precolumns (stripper). Early eluting components vent at port 6 while components of interest are retained on the stripper. When the valve is switched, a new injection is made onto the second stripper while components retained on the first stripper are backflushed onto the analytical column at port 9. This method requires an auxiliary pump at port 4.

Further reference

More applications with two position valves
Valco injectors and valves
Cheminert injectors and valves