Select up to six columns for different analytical methods on the same instrument

The valve has a spring-loaded detent mechanism which allows continuous rotation in either direction and ensures that the shaft “falls into” each position at the precise 60° spacing.

The common port of this valve connects to the injector. Turning the valve handle directs the flow into one of up to six columns connected to the six peripheral ports. A second valve is placed at the column outlets to select the operating column effluent and direct it to the detector. The valves accepting ¹/₁₆" fittings have internal passages of 0.4mm I.D., with a total internal volume less than 2µL. This has a significant effect on resolution. This valve can be used for mobile phase selection by connecting the common port to a pump inlet.