Hydronic system pipe noise


Old 12-13-18, 09:02 PM
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Hydronic system pipe noise

I have an older hydronic system and had to recently replace the circulator pump (B&G series100) with a newer B&G NFR33. We bled the loops when the pump was replaced but continue to get a lot of pipe banging whenever the zone valves close. Each zone (3 total) has a different noise level. I don't think the noise is caused by air in the lines but rather due to the increase of flow volume with the new pump. I have ball valves installed in each return so I was able to throttle down the flow a bit and it seems to have significantly decreased the banging pipe noise. I am looking for some advice on what could be done to eliminate this annoying problem.
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Old 12-14-18, 08:45 AM
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Sounds like you reversed the direction of flow when you replaced the circ.
Old 12-14-18, 09:10 AM
Join Date: Jan 2014
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Do you have Honeywell zone valves? There is a known problem with them banging when closing. You can reduce the noise (or maybe even eliminate it) by detaching one of the springs in the motor head. Google "Honeywell valve banging" to find more info. I think there is a Youtube video that shows which spring to detach.
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