I have a problem with sprinkles system, when activated, you hear a noise like the sound of hammer arrest, and check all the pipes are fastened correctly, but the noise continues, but it does when it starts, these valves are connected in the back of the house, others are front and there is no problem, someone could help me to find the problem, thanks

I've just bought an irrigation business and only have about 2 months worth of knowledge on the subject. Have you tried adjusting the water pressure leading to the back going out side? Often, I've seen this happen if the valves not turned all the way on or it could even be a worn out seat washer. It's a very hard question to answer otherwise. I'm not sure how many zone boxes you have, but if that wasn't the problem, you may want to go and look at the individual valves in each zone.

Tubes are new, only two, the cold water line that supplies this valve is the line that passes first through the water heater, then follows the T one is for sprinkles and the other goes to the laundry, the truth is very strange . Try to check the valves again, thanks Quinn

I have two valves for sprinkles