TRV's

[telstar]

Long story but the crux of the matter is, due to misinformation , I've ended up with all my TRV's on the return side of the rads How vital is it to correct this as it does seem to work ok, all except for one TRV which hammers if turned anything less than fully open?

 

[muggles]

It depends on what make of TRV you have, if they're bi-directional it should be fine, if they're only single direction ones you might get problems. The one that's noisy probably needs moving

 

[telstar]

Thanks muggles, hopefully then I will find a flow direction arrow stamped on the TRV if they are one directional?

 

[GavThePlumber]

Drayton valves that i fit have a selector under the head (which you need to remove to adjust)

Not a big deal if done properly.

 

[D_Hailsham]

Drayton valves that i fit have a selector under the head (which you need to remove to adjust).

Do you mean Danfoss?

 

[ianmcd]

Its not a problem to have TRVs on the return if they are installed correctly, do you know what make and model of TRV you have ? if not post a pic most of us will recognise the common ones

 

[GavThePlumber]

Drayton valves that i fit have a selector under the head (which you need to remove to adjust).

Do you mean Danfoss?

Yes RAS-C² is the ones i am on about

 

[telstar]

Thank you guy's for your interest and help. Going to try now and post a pic of one of the TRV's.

Untitled

• telstar
• 8 Mar 2014
• 1

I hope someone can give further guidance given the picture.
Many thanks

 

[muggles]

Those are bi-directional ones so they should be OK on the return, but you might need to move the one that's noisy if its bothering you

 

[ianmcd]

As Muggles correctly advises the TRV`s that you have are bi-directional so shouldnt really matter which end they are on , however we all know that this is not always the case regardless of what the manufacturer says, forget about moving the ones that are OK and remove the sensor head from the one that causes problems , if this sorts it out then you dont have to move it to the other side of the radiator just turn the valve from vertical to horizontal and that will sort it

 

[D_Hailsham]

Untitled

• telstar
• 8 Mar 2014
• 1

The double-headed arrow means they are bi-directional, i.e can go on either flow or return.

(Aside) I do wish posters would make sure that pics were posted the right way up; I initially thought the TRV was under the rad.

A noisy TRV is caused by too high a pressure differential across the TRV. This is normally caused by the system not balanced correctly.

Try the Quick Balance Procedure

 

[telstar]

Thanks for all your help and guidance guys.
Sorry the picture is on it's side, first time I've posted a picture on this forum.
It's a great relief to learn they are bi-directional , I had visions of doing an awkward x-over below the boiler. My only issue now is the noisy one which I will deal with armed with your advice.
Thank you one and all