When two different columns are required at frequent intervals at similar oven temperatures, a 6 port valve can provide rapid selection of the one to be used. The column not in use is protected by a blanket of inert mobile phase, and may be rapidly brought to equilibrium when required. (An 8 or 10 port valve is required if flow must be maintained to the non-selected column.)
Click below to change the valve position. (Currently shown in Position A)
A: Column 1 selected
B: Column 2 selected
