here`s a good un

[doitall]

thanx i am now beginning to understand what you mean...do I need a professional to adjust the pressure if this is the case?

If removing the heacd has stopped the problem, then you could try a few things first,

If the boiler will allow it ( read the instruction ) try turning the pump speed down a notch, and try it with the head back on.

Again if the boiler will allow it you could change the pump to an grundfos Alpha pump, (but I don't think you can)

Trace the towel rail back and identify which pipes its connected too, fully open both valves.

Finally you will need an Auto by-pass valve fitted into the pipework.

 

[yorkyuk]

thanxdoitall
I cant help being daft but I will try your suggestions

thanx for your time

 

[Balenza]

Diyitall wrote

As the valves close the pressure in the system increases beyond the manufactureres limits for the valve so the pin bounces, and causes the noise.

Only if their is reverse flow taking place and the valve is not designed for reverse flow.
What happens is the increased velocity on the upper side of the seal pushes the jumper against the valve seat and the spring then counteracts pulling it back. If its fitted correctly this won't happen.
Fitting an auto by-pass may not necessarily cure the problem and in any case their may already be an ABV fitted.

 

[D_Hailsham]

yes trv on all rads they are all set fully open to (hopefully) enenly distribute the heat

If you have all TRVs set fully open you might as well not have them!

The whole point of a TRV is that it automatically opens and closes to maintain the room at a constant temperature, say 20C. Provided the radiators in each room are properly sized for the room volume and heat loss through the walls the heat will be properly distributed.

Do you really mean that you have the wall thermostat set to 30deg? (page 2, first post) Where did you live previously, Abu Dhabi? What's (note correct use of apostrophe!) your gas bill??

 

[yorkyuk]

balancing the radiators is such a fiddle its just easier to bang the heat out on them all.
Wife is always cold so stat to full for her

I pay by dd on my gas bill @15£pm and am in credit for the last quarter,spose it will go debit now winter is here.

 

[doitall]

Diyitall wrote

As the valves close the pressure in the system increases beyond the manufactureres limits for the valve so the pin bounces, and causes the noise.

Only if their is reverse flow taking place and the valve is not designed for reverse flow.
What happens is the increased velocity on the upper side of the seal pushes the jumper against the valve seat and the spring then counteracts pulling it back. If its fitted correctly this won't happen.
Fitting an auto by-pass may not necessarily cure the problem and in any case their may already be an ABV fitted.

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Mod9
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May I suggest before you post on the subject you consult with the manufacturers, they will tell you different.

 

[namsag]

DOITALL please explain why every other trv on this system is not chattering as it trys to shut

 

[doitall]

DOITALL please explain why every other trv on this system is not chattering as it trys to shut

Quite simply they may do just that if you turned the one off that is causing the problem

The pump head is forcing the valve to open, if you shut that valve down it can move to the next one.

If the OP posts the make of the valve I should be able to tell you the maximum head/pressure

http://www.rwc.co.uk/public/training/qasept02.pdf

http://www.onlineplumbingsupplies.co.uk/acatalog/DU145.pdf

http://danfoss-randall.co.uk/PCMPDF/VD55K712_AVDO.pdf

 

[Blasphemous]

Lots of greengrocers' apostrophes there! Plurals like ABVs do not have apostrophes. The apostrophe signifies a missing letter, as in it's as a short version of it is, or they're for they are. It's also used to form the possessive, as in John's ball (the ball of or belonging to John). This is because the old form of the possessive was Johnes but the e has been substituted by an apostrophe.

sorry for laughing Chris. You might not believe this but I used to be a Trainer for Trinity Mirror (or perhaps you will).

In my defence I did say I was 'having one of those lives'. I had one or two glasses (or is that glass's ) of Chateau Neuf du Pape last night (I like it... a LOT). Normally my 'granma' is very good

I must not abuse apostrophes.
I must not abuse apostrophes.
I must not abuse apostrophes.
I must stop drinking red wine late at night!

 

[namsag]

doitall.. The guy has already said he has ONE noisy valve and to cure it he turns it down in effect OFF no other valve gets noisy untill an hour ish later when the same one gets noisy again.
Do you honestly think that no other room in the house is getting up to temp and supporting your theory with noisy valves in those rooms whilst the offending one is off

 

[chrishutt]

I must not abuse apostrophes.

Blasphemous by name.......You're not the only one by any means. TRV's and BTU's seems to be the most common on on this forum. People seem to think that a plural form of TLAs (three letter acronyms) must have an apostrophe! I'm sure if anyone went to the trouble of checking through my five thousand odd posts they'd find a few. I tend to write lot's for lots and it's for its (possessive).

 

[doitall]

doitall.. The guy has already said he has ONE noisy valve and to cure it he turns it down in effect OFF no other valve gets noisy untill an hour ish later when the same one gets noisy again.
Do you honestly think that no other room in the house is getting up to temp and supporting your theory with noisy valves in those rooms whilst the offending one is off

I don't need to think anything

It's easy to prove by taking the head off the valve, either the noice stops or it does'nt

 

[ChrisR]

DO you mean "doesn't"?
It's that double capital I keep letting in.

Ia'm with nam'sag on thi's. SHow me a TRV spec which say its working pres'sure is less than 6 metre's (which, yorkuk, is the highest your pump is likely to be). IE an ABV wouldn't help.

Yorkuk look for little arrow(s) on the trv body. See which end of the rad warms up first. If there's an arrow indicating direction and the valve's backwards it can make funny noises. If there's an L with an arrow each end, that shouldn't be the problem, but can still be on knackered valves.

Some TRV's DO have maximum FLOW specs though - if the lockshield is too far open the valve can rattle because the flow's too high. So shut the lockshield down, to say just half a turn open. Only BIG radiators a long way from the pump are likely to need much more than that.

If you don't balance the system at all, it won't work properly. The lockshields on the rads near the pump need turning down or the furthest rads may never heat up in cold weather.

 

[doitall]

If the op posts the make and model of the valves, the maximum differential pressure will be in their data sheet

 

[yorkyuk]

hi folks

last night i turned the offending trv completely off and this has stopped the noise(or at least last night and this am) so does this make me lean towards a defective trv??