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Starting Member


Tuesday, September 21st 2010, 11:33am

Rainbird valve makes repeating thumping

The Rainbird jartop valve that is connected to my dripper line creates a repeating thumping noise. Sometimes it only starts after you turn on a fixture in the house, sometimes it starts as soon as it turns on.

This is different from a water hammer that happens once at opening or closing, this will keep going thump-thump-thump indefinitely until the valve is closed.

I have installed a water-hammer arrestor next to the manifold, but the problem occurs with or without it.



Supreme Member

Posts: 5,269

Location: Metro NYC


Tuesday, September 21st 2010, 2:38pm

Throttle down the flow control on the thumping zone valve.




Friday, September 24th 2010, 1:45pm

Your diapharm is starting to "wear" out. Just take it apart and get a new and replace it.

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