Cold Water tap Slamming.

[aircraftspotter]

I have just replaced my Bathroom sink and my new sink has a monoblock tap. All is fine except when you turn the cold water off the tap slams/bangs and makes the whole house pipework bang. If you turn the tap on slowly at a certain position the water pulsates (cavitates?). I've tried turning on all the cold water outlets to clear a possibe airlock but to no avail.

 

[ChrisR]

Your pipes are not clamped firmly enough, you may have a craapy tap which has loose bits inside which can jump about. You may still have a bit of air trapped which is acting like a spring - it will dissolve into the water eventually. The jumper on the mains stop cock could be causing the pipe hammer, try turning it a bit. You may have extremely high water pressure. Sometimes everything fails and you need a shock absorber.

 

[aircraftspotter]

Thanks for the advice. But, what is the jumper on the stop cock?

 

[redulike]

I have the same problem with banging when the cold taps are closed quickly. I haven't heard of shock absorbers in plumbing. Is this a wind-up or is it true?

Another side-effect of ceramic taps with high water pressure is that the taps are incredibly noisy when turned on to a trickle (like for teeth cleaning). It probably doesn't help that there is an isolator fitted underneath too.

Red

 

[AlanE]

And there was me believing all this hype that our trade was childs play!!

Yes they do actually exist. And the jumper is the loose part the washer fit onto.

Alan