Hello,

Whenever we turned on our cold water taps, the pipes made a knocking
noise, so I fitted a PRV and reduced the mains from 4 bar down to 3
bar and this has cured the knocking.

However, whilst it has solved one problem it has created another: our
toilets have torbeck valves in them and now when the cistern fills up,
there is a bang as the valve switches off.

Is there a way to cure this hammer, so our pipes can be peaceful at
last?

Thanks,
Stephen.

Stephen wrote:

However, whilst it has solved one problem it has created another: our
toilets have torbeck valves in them and now when the cistern fills up,
there is a bang as the valve switches off.

Do you have individual isolation valves on the feed pipes to the toilet
cisterns? If so have you tried partly closing these - it can sometimes
help?

David

In article ,
Stephen wrote:
Hello,

Whenever we turned on our cold water taps, the pipes made a knocking
noise, so I fitted a PRV and reduced the mains from 4 bar down to 3
bar and this has cured the knocking.

However, whilst it has solved one problem it has created another: our
toilets have torbeck valves in them and now when the cistern fills up,
there is a bang as the valve switches off.

Is there a way to cure this hammer, so our pipes can be peaceful at
last?

Had exactly the same problem, and largely cured it by shutting the valves on
the loo down. Problem was it took ages to refill then.

When we had the boiler replaced the plumber noticed the problem and fixed it
while he had things drained down without me asking (apparantly he used the loo
and realised it took forever to fill )

We now have something very similar to

http://www.toolstation.com/shop/Plum.../sd2696/p93058

fitted to the incoming mains. Completely cured the problem.

YMMV,

Darren

Stephen wrote:
Hello,

Whenever we turned on our cold water taps, the pipes made a knocking
noise, so I fitted a PRV and reduced the mains from 4 bar down to 3
bar and this has cured the knocking.

However, whilst it has solved one problem it has created another: our
toilets have torbeck valves in them and now when the cistern fills up,
there is a bang as the valve switches off.

Is there a way to cure this hammer, so our pipes can be peaceful at
last?

Thanks,
Stephen.

I found this publication, which you might be interested in:

http://www.heatweb.com/pdf/RWC/Fault...0april02 .pdf

"Dave Osborne" wrote in message
...
Stephen wrote:
Hello,

Whenever we turned on our cold water taps, the pipes made a knocking
noise, so I fitted a PRV and reduced the mains from 4 bar down to 3
bar and this has cured the knocking.

However, whilst it has solved one problem it has created another: our
toilets have torbeck valves in them and now when the cistern fills up,
there is a bang as the valve switches off.

Is there a way to cure this hammer, so our pipes can be peaceful at
last?

Thanks,
Stephen.

I found this publication, which you might be interested in:

http://www.heatweb.com/pdf/RWC/Fault...0april02 .pdf

Poor quality washing machine hoses can cause the problem if their walls have
become elastic. Turning off a tap causes a pressure wave to make it swell
and it then recoils.

Good article - I especially like the fact it explains that a partly closed
service valve is not a pressure reducing device.

dmc wrote:
In article ,
Stephen wrote:
Hello,

Whenever we turned on our cold water taps, the pipes made a knocking
noise, so I fitted a PRV and reduced the mains from 4 bar down to 3
bar and this has cured the knocking.

However, whilst it has solved one problem it has created another: our
toilets have torbeck valves in them and now when the cistern fills up,
there is a bang as the valve switches off.

Is there a way to cure this hammer, so our pipes can be peaceful at
last?

Had exactly the same problem, and largely cured it by shutting the valves on
the loo down. Problem was it took ages to refill then.

When we had the boiler replaced the plumber noticed the problem and fixed it
while he had things drained down without me asking (apparantly he used the loo
and realised it took forever to fill )

We now have something very similar to

http://www.toolstation.com/shop/Plum.../sd2696/p93058

fitted to the incoming mains. Completely cured the problem.

YMMV,

Darren

A simpler option is an upward pointing leg of pipework just a few
inches long. It gradually fills with air from the water, then acting
to absorb shocks to some degree

http://www.wiki.diyfaq.org.uk/index....le=Noisy_Pipes


NT

"Stephen" wrote in message
...
Hello,

Whenever we turned on our cold water taps, the pipes made a knocking
noise, so I fitted a PRV and reduced the mains from 4 bar down to 3
bar and this has cured the knocking.

However, whilst it has solved one problem it has created another: our
toilets have torbeck valves in them and now when the cistern fills up,
there is a bang as the valve switches off.

Is there a way to cure this hammer, so our pipes can be peaceful at
last?

Thanks,
Stephen.
I once changed the incoming mains water from copper pipe to plastic (Hep2O)
and that cured the water hammer as a side effect.


__________ Information from ESET NOD32 Antivirus, version of virus signature database 4127 (20090603) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com

On Mon, 1 Jun 2009 17:55:36 +0100, "John"
wrote:

Poor quality washing machine hoses can cause the problem if their walls have
become elastic. Turning off a tap causes a pressure wave to make it swell
and it then recoils.

It isn't the washing machine because even with that disconnected, I
still get the noise. The noise only occur when the toilet torbeck
valve closes; opening and closing taps does not make any noise.