Hi Gerardjoe,
I'm not sure that I completely understand what you're trying to do. In the DSC modules, the valves (2D and 3D) are simply boolean indicators.
One thing you could do, to see some sort of a percentage change, would be to have an indicator such as a vertical fill slide. Here, you would put a number between 0-100.
Then, you could have a comparison, such that if this value was over, say, 60, then the boolean value would be true and the valve would turn on. Else, the value would be false and the valve would stay false.
I hope that this answers your question; if I did not understand correctly, please do respond and clarify.
-Sam F, DAQ Marketing Manager