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  #1  
Old 06-24-2012, 05:30 PM
chris2879 chris2879 is offline
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Febco Backflow vibration/hammer

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?
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Old 06-24-2012, 06:40 PM
Mikegyver Mikegyver is offline
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PVB, DCVA, or RP?
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  #3  
Old 06-24-2012, 06:46 PM
chris2879 chris2879 is offline
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Pressure Vacuum Breaker (PBV).
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Old 06-24-2012, 07:28 PM
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Wet_Boots Wet_Boots is online now
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What make and model of zone valve?
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  #5  
Old 06-24-2012, 07:44 PM
chris2879 chris2879 is offline
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It's an Irritrol 2400T 1" (w/o flow control)
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Old 06-24-2012, 08:03 PM
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try a flow-control valve
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Old 06-24-2012, 08:26 PM
chris2879 chris2879 is offline
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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?
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Old 06-24-2012, 08:37 PM
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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
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