slow closing valve

billygoat22

I have a customer that system has developed slamming noise/ waterhammer. when more than one zone is calling and one closes, gets a banging.

if I slow the rate of closing on zone valves by easing on shut, (honeywell 8043) do not get slamming. If one zone running, no noise when closes, since pump shuts off as it closes.

waould like to know if I can retrofit a slow closing valve motor in place of the existing motor to stop the waterhammer? thanks.

Paul48

Zone valve backwards?

hot_rod

Often that hammer is caused by too much pump. Or the valve is in backwards

If it's possible. Delta P circ is a nice fix, and it reduces power consumption

billygoat22

valves in right, 1st thing I checked. only one pump for system. has 4- 3/4" lines, one of which is domestic hot water. other three are series loop basebd circuits for each floor.

TomS

Simple fix. Remove the cover on the zone valve and you will see two springs. Unhook one end of the spring that is easily assessable with fine needle nose pliers. This will allow the valve to close slowly.

Dave H_2

If it just "developed", what changed? Was it always there?
What type of circulator is installed?

More often than not, it could be just the application and choosing the correct circ for the project. Variable speed circs can and will help, but without knowing what changed, you just dont want to throw money at it and hope that is fixes it.
I always want to know exactly whats wrong/changed/ so that it fixes it the first time.

Dave