If you understand your kitchen faucet then you understand a mixing valve. If you have a combo tub shower valve then you understand a mixing valve with a diverter feature.
Theoretecly you can add as many valves as you want. The closer you can get the pressure and GPM from each line going into the manifold to be the same, the more accurate/consistant your valve settings and mix will be coming out of the manifold.
Some chemicals don’t play well together and to pump them together through the same pump/ lines/guns would not be a good choice in my opinion. So now your back to flushing out the system every time you use a different chem.
If your working with only one pump and your tryinCg to control things from the suction side, then that’s even more valves and headaches… Of course then you could really go crazy and buy chemical injection pumps and tie them into the sysyem up stream.
More parts equals more money, more things to break, more things to go wrong and a steeper Learning curve.
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