While the ban is on, you would like the irrigation to use the pump and when lifted, city?
I am not sure which valve you looked at. I believe they can be hooked up either:
- One in and one of two out
- One of two in and one out
I do not know for sure, but it seems like the city would likely require a backflow preventor between such a three-way valve to keep either pump water or sprinkler water from going into the city pipe.