I have an 8890 GC designed for refinery gas (gas samples through valves, no liquids, no auto sampler), using OpenLab CDS. I do not have a gas sampling valve but would like to set up a virtual valve so the injection will trigger in a sequence. I did this many years ago with a 6890 and B.04 ChemStation, but cannot remember how. I want to say you configured the virtual valve as either valve 6 or valve 10. Any help would be much appreciated.