I installed a recirculating line for a customer the other day. Only a 20' run of copper, installed a swing check on the horizontal before the final drop to the water heater. This is a gravity system. Got a call from the customer today and said that there is a banging sound coming whenever she turns the hot water on. Go to the house and track the noise down to the check valve. Installed a shock arrestor on the line and it helped alot, but it still bangs enough to hear it on the 1st floor. I would appreciate some input as far as installing a spring loaded check or is there something else that would eliminate the rest of the noise. This is the first time this has ever happened. By the way I took the check apart and it was clean.
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