Water Hammer returns!

Mayo Exile

Hi all. In a ground floor apartment (new build) with a combination cylinder water system. Was getting water hammer (fairly high pitched banging noise).

Plumber (contractor for the estate) came and put on this junction. (see picture 1). It cured it for a week or so, but now its back. Actually a deeper noise now, with more noticeable shaking of the cold water pipe (half inch pipe).

I stuck some pieces of cardboard in between the pipe and the wall. (see picture 2). This seems to have mostly stopped it. But is it a long term solution to the problem? What needs to be actually done to stop it properly?

Also what does this white box do? (picture 3) Attached to one of the hot water pipes. Gets quite warm when heating is on. Should it be like this? Heating powered by natural gas.

Thanks in advance.

pipers

I would suggest to replace the ballcock with an equilibrium type. I have posted before about this, see my earlier threads.

The white box is a motorised valve.

Mayo Exile

Cheers pipers! Will probably call plumber back to do this to fix hammer problem.

Is it normal for the motorised valve to be warm during operation?

10-10-20

Yes, they get warm, but not hot.

Mayo Exile

Yes, they get warm, but not hot.

Thanks 10-10-20! I would say the housing (plastic) gets pretty warm. You can still touch it though.

311

You could try getting a pressure reducing valve installed on the mains ,it would do the trick.
Or get the piece of pipe(Extension he put on) made bigger it might help.