As i did take some months off modding i did not follow the last updates, yet as soon as i sort some stuff in my lib (which i'm already working on since last week) i'll update my mods and publish some more as in the meantime i had some ideas i want to implement.
Anyways, this can be done two ways:
1 - A set of valves for each pipe tier
2 - Have the valves to mimic flow capacity based on the pipe feeding the valve
I'll see what solution works better (most likely the first)