Set the tip aside to dry before attempting to use it again. The tips dry very quickly. Please don't place on a heated surface to dry. You know, like the top of the kiln. Don't do that.
If you want to continue using the same kind of ink you just finished working with, there is no need to clean out the valve or the pen. Just put the cap back on the pen and store in an upright condition.
HINT: I keep my pens in a mug and put the tips in the mug with the pens so I don't lose them because I am very scatterbrained and I lose things.