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Sunday, November 22nd 2015, 7:37am

Downstream pipe vibration


I installed a sprinkler system a few years ago, and there is pipe vibration after the tee to the valve box. In arizona. The vibration occurs in a masonry wall, and I don't believe it can be fastened to help prevent vibration.

So, from the water meter: a tee to valve box, a back flow preventer, 6 valves with in-line pressure reducers.

I have observed that the BPD is about 12" above most orifices, but one raised planter zone is about equal in height. The vibration occurs with numerous valves, so I'm inclined to believe the vibration is caused for reasons other than the height of the BPD.

Thank you for your help,



Supreme Member

Posts: 5,288

Location: Metro NYC


Sunday, November 22nd 2015, 11:04am

Is this drip irrigation? It would be very useful to know what is the flow on each zone, because low flow can create problems for the valves.


Advanced Member

Posts: 111

Location: Omaha, Nebraska, USA


Monday, November 23rd 2015, 3:44pm

Is your backflow a PVB? If so, you might check the check valve(below the spring) and see if it is ok. If it is broken, sometimes that rubber disk will flutter and cause vibration.


Starting Member


Saturday, November 28th 2015, 9:22pm


Yes, after the valves it is drip irrigation on some zones. They have a 25 psi reducer each valve. Some valves go to bubblers and a few drip nozzles.

What is PVB?

The vibration is in the wall not at the back flow preventer. I'll try and take some pictures tomorrow.

Thank you!


Supreme Member

Posts: 5,288

Location: Metro NYC


Sunday, November 29th 2015, 7:24am

You could open the end of one of the drip lines, and see if the vibration persists.

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