TRV's on 'Return' side of rad. Are they are bi-directional from pic attached

[samsg30]

Hi,


I have got 14 radiators in total and three of them have got TRVs installed on the return side.


2 of them are downstairs which are not heating up too much as compared to all other radiators.


I went through balancing myself (have to do it again little better this time).


Could anyone please tell me from the pictures if these TRVs bi-directional and if not, then what issues would I expect?


Pictures are of save TRV from top, front and back to show arrows and markings. I have put 'R' sign myself so I know which ones are on 'Return'

 

[snowhead]

If they're Bi directional they usually have a double arrow on;

https://www.columnrads.co.uk/gold-f...gclid=COen75bfkM0CFVIYGwodeiEIZA#.V1QH876SPIU

 

[Best]

With the valve fitted vertically, as in photo, it looks like it should be fitted on return. Arrow is pointing down, so it must be correct
Try turning most of other rads off to see if the two rads will work better. If they do improve then if system not dirty you might still have a balancing problem or TRVs are faulty, or perhaps circulating pump not working well enough. If you have a hot cylinder then it might need balanced.

 

[samsg30]

With the valve fitted vertically, as in photo, it looks like it should be fitted on return. Arrow is pointing down, so it must be correct
Try turning most of other rads off to see if the two rads will work better. If they do improve then if system not dirty you might still have a balancing problem or TRVs are faulty, or perhaps circulating pump not working well enough. If you have a hot cylinder then it might need balanced.

Well I have got same TRVs installed on all radiators..but 3 in return and other in flow.

Also I had another look around radiators and TRVs and found that LSV has also got arrows ... some pointing upwards and some pointing downwards.. and to make issue worse... it has been installed in all combinations possible... e.g.

One radiator has got both TRV and LSV arrow downwards
One has got TRV arrow down but installed in flow and LSV arrow up but installed in Return
Another one got opposite of above.

So before I start getting worried and spend huge money getting 10 radiators corrected, can I know what implications, having incorrect return flow trv and Lsv could have on heating.

Although all these radiators I am mentioning are getting hot except downstairs one. Do I need to take any special care for balancing?

 

[GrahamM]

Reduced flow/efficiency, valves could be become noisy, possible balancing issues.
I would change any valves that are on the return.
Personally I would replace with new TRV's if going to bother.

 

[Howsie]

Reduced flow/efficiency, valves could be become noisy, possible balancing issues.
I would change any valves that are on the return.
Personally I would replace with new TRV's if going to bother.

Like what he says!