Description
Add valves, which can point in any of the 6 directions, and force essentia to flow in one direction only. Giving a valve a redstone signal disables flow through it.

Add merger-splitters, which take two inputs on north-south or east-west and two outputs on the other horizontal axis. They merge the flow from the inputs and then split it 50-50 (or perhaps have a variable split) to the outputs.

Pistons now work properly with conduits, which makes valves largely unnecessary. I am not planning to implement them at this time.