actualy The pressure remains at 110 until a faucet is opened or I loosen the guage, I never left it on for an extended period of time to see if the guage settled back down. pressure before sprinkler comes on is 75psi and then with sprinklers running drops to around 40psi in the house. don't have a prv now and I do have an expansion tank on water heater , also the city has a backflow preventer at the meter at the curb, so no water can expand back that way either.
Put a Regulator on the line to house after the sprinkler Drop the pressure down to 50-60 psi.
I have seen solenoid valves slam shut and cause a spike. You say spike. do you mean that you have a gauge and when the sprinkler shuts off the needle jumps to 110 for a moment like a bounce and then settles to a lower pressure. or does the pressure remain at 110? Do you have a prv now. what is the pressure before the sprinkler come on? Could be the exiting PRV is not working properly or the spike is caused by the solenoid is slamming shut.
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