I have a brass back flow valve on my system now it is 1 1/4 Wilkins #35 and it makes a very loud moaning or groaning noise. The systems doesn't work I am not getting any water to any of sprinklers just before the moaning problem happened when then system was switching zones it would back a loud banging noise then go to the next zone was all this contributed to the back flow valve not working properly?? Can us all the help I can get. i need to fix this we are in a drought and am losing my grass.
