Water pressure will not turn on a valve, only an electric signal will trigger a valve. Up north where you have to winterize your sprinkler system, I had to turn off the water so I can turn on 1 zone at a time to blow it out, no pressure or the lack of pressure did not have any impact to valve turning on.
If I was going to run a system in manual mode, then you need a wifi smart controller so you can do this from inside your house or anywhere in the world
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