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chris2879
06-24-2012, 05:30 PM
I recently added a 8th zone for drip irrigation to my sprinkler system. The drip system has 3/4" pipe with a 30 psi pressure regulator and about 25 emitters taped into the 3/4" pipe. Some of the 3/4" pipe goes uphill.

The problem that i noticed is when i turn on the drip zone, the back flow preventor seems to be hammering or vibrating. The flow to the emitters is very low but that is intended to do a longer slow soaking for the flowers and roses. I read someplace that the back-flow preventor could be getting messed up because there is not enough flow.

Anyone have any idea what the issue is and how i can fix it?

Mikegyver
06-24-2012, 06:40 PM
PVB, DCVA, or RP?

chris2879
06-24-2012, 06:46 PM
Pressure Vacuum Breaker (PBV).

Wet_Boots
06-24-2012, 07:28 PM
What make and model of zone valve?

chris2879
06-24-2012, 07:44 PM
It's an Irritrol 2400T 1" (w/o flow control)

Wet_Boots
06-24-2012, 08:03 PM
try a flow-control valve

chris2879
06-24-2012, 08:26 PM
I tried limiting the flow by closing the output of the PVB and it had no affect, which would be similar to the behavior of a flow control valve right? Could it be something with the PVB?

Wet_Boots
06-24-2012, 08:37 PM
just change the damn zone valve and stop wasting our time - if you're handy, you can swap the internals of the 2400TF with your valve