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New Member


Friday, April 30th 2010, 6:39pm

knocing noise

When turning on sprinkler from timer box you hear water go on then a bang in the pipe. It then goes on each zone ok and shuts off ok just starting up. Also if the water pressure is to high entering a system can it also cause a banging noise in the pipe .

This post has been edited 1 times, last edit by "Istorch" (May 9th 2010, 5:44pm)

Old Guy

New Member


Tuesday, May 11th 2010, 9:43am

taken from anoter thread;

Also, note that there is banging when the zone is first opened, and that is not water hammer. It is something of an oscillation you can sometimes see when a system is first opened in the spring, where there is no water in the zone for the supply to 'push' against. When it happens on a recurring basis, you look to make changes. Installing check valves in the heads is one obvious choice nowadays, to keep a zone full of water, so there's something to 'push' against. Throttling down a zone valve flow control is another option. Changing zone valves is another.

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