I secured the pipes inside and they don't bang around as much but they are still very loud, I was afraid that the jartops might be part of the problem, I don't use them anymore. There is banging both on valve opening and closing, i don't understand why it makes noise on opening, maybe someone has some insight into that phenomenon. The banging on opening only occurs sometimes, but they always bang on closing. Thanks for the help, John Jesse
I am having problems with bad water hammer when using the rain bird JTV 1 inch valves. I have these valves at 2 specific installs that are giving me the most trouble. The one that I have the info for has 4 1 inch JTV valves on a 1 inch PVC manifold fed by 3/4 inch copper straight from the meter, the valves feed 3/4 inch poly pipe. I have tried reducing the low by renozzling so the largest zone has 3 RB 5000's with 2 GPH nozzles. Water pressure is about 75 PSI. Before I replaced the manafolds and...
