Sample injection with a 6 port valve

Two position valve application
(Non-Java)

With the valve in Position A, sample flows through the external loop while the carrier flows directly through to the chromatographic column. When the valve is switched to Position B, the sample contained in the sample loop and valve flow passage is injected onto the column.

Further reference

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