Question
Good morning.  I have a garden drip system with a Hardie 700 series valve, filter, pressure reducer setup.  When this zone comes on, I get a fluttering, vibrating noise all the way back to the copper pipes in the house - fairly loud.  Remainds the entire time the zone is running. Holding the copper I can feel the internal vibration, but it is not the pipe knocking against anything.  All other zones are silent, including another drip zone.  Valve not opening all the way?  Partial clog in the valve?  Thanks in advance.

Answer
Thanks for your question.
I sounds like you may not be flowing enough water through the valve. Try opening one of the ends of the drip tube and see if it will open and close correctly.
If this cures the problem. You will need to add more emitters to the drip pipe in order to increase the flow.

Matt