Whenthis valvewas turnedONthe sample streamwas halted and reagent solution (R1) flowed through valve V3 towards coil B3 and while it was switched OFF the sample stream flowed again.
This ON/OFF event named as sampling cycle could be repeated several times to fill the reaction coil with a string comprising slugs of sample in tandem with slugs of reagent. When this valve was maintained OFF the sample stream flowed continuously, thus displacing the mixing of sample and reagent solution towards the detectors (Det1, Det2) where the analytical signal was generate.