SPRINKLER TALK FORUM - You Got Questions, We've Got Answers

I have 4 stations on an electronic timer. In the past several months of operation, I have had valves explode and crack 4 different times. These are real explosions. Twice I've found big pieces of plastic on the other side of the box that blew from the valve. Details:



--1 inch rainbird in-line sprinkler valves. All fairly new, not older than a year or two

--My yard is a slope. The valves are at the highest point of the hill--one of the stations goes downhill and waters yard 50 feet lower

--When they aren't exploding, when they shut off there is a clanking noise about 10 or 12 times that sounds like someone taking a sledge hammer to the side of the house.

--There are 4 valves total in a manifold all with threaded/collared couplers on sprinkler side and main side of the valves.



Let me know if any other information would help solve the mystery