Hi I have a problem with noisy TRVs.

I Have a Baxi combi boiler supplying 6 radiators with Caleffi thermostatic 
valves and a towel rail with plain locksheild vales (fully open flow and 
return).
When any of the radiators reach the point where the are satisfied for heat 
the valves make a loud noisy that changes in pitch till it stops this can 
take 10 minuets. It sounds like a hammer drill and is loud enough for my 
neighbours to ask about it. Not good in a morning as you have to get up when 
the heating comes on or get up to a cold house.

Some one told me I need to have a Differential Bypass Valve fitted; what 
does this do and why don't these need to be fitted to all heating systems?

Cheers Norman

On Thu, 13 Oct 2005 19:56:53 GMT, "Norman"
 wrote:


>Hi I have a problem with noisy TRVs.
>
>I Have a Baxi combi boiler supplying 6 radiators with Caleffi thermostatic 
>valves and a towel rail with plain locksheild vales (fully open flow and 
>return).
>When any of the radiators reach the point where the are satisfied for heat 
>the valves make a loud noisy that changes in pitch till it stops this can 
>take 10 minuets. It sounds like a hammer drill and is loud enough for my 
>neighbours to ask about it. Not good in a morning as you have to get up when 
>the heating comes on or get up to a cold house.
>
>Some one told me I need to have a Differential Bypass Valve fitted; what 
>does this do and why don't these need to be fitted to all heating systems?
>
>Cheers Norman 
>

Sounds like your flow and return is going the wrong way.

No checked that !!
Flow is hotter than return, valves fitted on flow side but according to 
Caleffi's web site valves are suitable to be fitted on both.


"EricP"  wrote in message 
news:k8ftk154g32lmlp6hh7neolupciv3pbuen@4ax.com...

> On Thu, 13 Oct 2005 19:56:53 GMT, "Norman"
>  wrote:
>
>>Hi I have a problem with noisy TRVs.
>>
>>I Have a Baxi combi boiler supplying 6 radiators with Caleffi thermostatic
>>valves and a towel rail with plain locksheild vales (fully open flow and
>>return).
>>When any of the radiators reach the point where the are satisfied for heat
>>the valves make a loud noisy that changes in pitch till it stops this can
>>take 10 minuets. It sounds like a hammer drill and is loud enough for my
>>neighbours to ask about it. Not good in a morning as you have to get up 
>>when
>>the heating comes on or get up to a cold house.
>>
>>Some one told me I need to have a Differential Bypass Valve fitted; what
>>does this do and why don't these need to be fitted to all heating systems?
>>
>>Cheers Norman
>>
> Sounds like your flow and return is going the wrong way. 

Never heard of a 'differential' bypass valve, but you've done the right 
thing by having one radiator that's not got a trv. Only thing I can think of 
is turning down the pump speed.
"Norman"  wrote in message 
news:9_y3f.850$xO2.734@newsfe6-win.ntli.net...

> Hi I have a problem with noisy TRVs.
>
> I Have a Baxi combi boiler supplying 6 radiators with Caleffi thermostatic 
> valves and a towel rail with plain locksheild vales (fully open flow and 
> return).
> When any of the radiators reach the point where the are satisfied for heat 
> the valves make a loud noisy that changes in pitch till it stops this can 
> take 10 minuets. It sounds like a hammer drill and is loud enough for my 
> neighbours to ask about it. Not good in a morning as you have to get up 
> when the heating comes on or get up to a cold house.
>
> Some one told me I need to have a Differential Bypass Valve fitted; what 
> does this do and why don't these need to be fitted to all heating systems?
>
> Cheers Norman
> 

"Norman"  wrote in message 
news:9_y3f.850$xO2.734@newsfe6-win.ntli.net...

> Hi I have a problem with noisy TRVs.
>
> I Have a Baxi combi boiler supplying 6 radiators with Caleffi thermostatic 
> valves and a towel rail with plain locksheild vales (fully open flow and 
> return).
> When any of the radiators reach the point where the are satisfied for heat 
> the valves make a loud noisy that changes in pitch till it stops this can 
> take 10 minuets. It sounds like a hammer drill and is loud enough for my 
> neighbours to ask about it. Not good in a morning as you have to get up 
> when the heating comes on or get up to a cold house.
>
> Some one told me I need to have a Differential Bypass Valve fitted; what 
> does this do and why don't these need to be fitted to all heating systems?
>
> Cheers Norman
>


Had the same problem a few months ago.

You'll probably find it's only 1 or 2 that's actually noisy. the problem 
with my TRV's were they were on their last legs, once i had replaced them no 
more noise.

-=Scozia=-

Fitted back to front!  Look for the flow arrow..

AE


"-=Scozia=-"  wrote in message 
news:434ed5f1$1_2@mk-nntp-2.news.uk.tiscali.com...

>
> "Norman"  wrote in message 
> news:9_y3f.850$xO2.734@newsfe6-win.ntli.net...
>> Hi I have a problem with noisy TRVs.
>>
>> I Have a Baxi combi boiler supplying 6 radiators with Caleffi 
>> thermostatic valves and a towel rail with plain locksheild vales (fully 
>> open flow and return).
>> When any of the radiators reach the point where the are satisfied for 
>> heat the valves make a loud noisy that changes in pitch till it stops 
>> this can take 10 minuets. It sounds like a hammer drill and is loud 
>> enough for my neighbours to ask about it. Not good in a morning as you 
>> have to get up when the heating comes on or get up to a cold house.
>>
>> Some one told me I need to have a Differential Bypass Valve fitted; what 
>> does this do and why don't these need to be fitted to all heating 
>> systems?
>>
>> Cheers Norman
>>
>
> Had the same problem a few months ago.
>
> You'll probably find it's only 1 or 2 that's actually noisy. the problem 
> with my TRV's were they were on their last legs, once i had replaced them 
> no more noise.
>
> -=Scozia=-
>