SD valves select one of 4 to 16 dead-ended streams. The selected stream flows from the valve
outlet to a sample valve, pressure sensor, detector, column, etc. The same configuration may
also be used to direct one stream to a number of outlets for applications such as fraction
collection. This example illustrates automated sampling of non-pressurized containers.
(Move your mouse cursor from highlighted step to step - no need to click.)
Step 1:
A vacuum pump moves sample from the containers to a 6 port sampling valve.
Step 2:
The 3 port valve blocks the vacuum flow through the sampling
valve to allow the sample within the loop to equilibrate at atmospheric pressure.
Step 3:
The 6 port valve is switched, injecting the sample.
