Crankcase breather question

So weird question. I have a vacuum brake bleeder pump. If i were to hook the pump to the pcv valve, put my finger over the bottom hole of the pcv valve and pull a vacuum on the pcv valve, i could take my finger off then slowly release the pressure a little at a time while watching the gauge and see at what minimum value the pcv valve holds the vacuum to get the point at which the orfice is fully closed and partially open. Would that work?