Directional TRV

[mike42]

Hello All

Bit confused. I'm resigned to draining down again as what I've done must be wrong.

So fitted this (link below) and one of the Q&A was "Can this be fitted on flow or return?". Answer from manufacturer was "No, its directional so must be fitted on the flow". Well luckily mine is fitted on the flow side of the rad but the valve body has an arrow pointing the opposite way. But isn't the correct answer "Yes it can be fitted on flow or return side of the rad but the arrow must point in the direction of the flow" ?

I should say even though the flow of water is against the arrow, it seems to work fine but I'm obviously not comfortable with it. If I left it would it suddenly decide to start clicking loudly in the night or something?

Drayton RT212 White Straight Thermostatic TRV 15mm x 1/2" - Screwfix

Order online at Screwfix.com. Provides low cost control of individual room temperatures. Fast-acting liquid sensor and chrome valve. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

 

[cross thread]

It can go on flow or return as long as the direction arrow is same as flow of water

 

[ianmcd]

if fitted against the flow of water, it might start getting noisey, nothing dangerous just annoying , some tick some thud, when closing, if it starts getting noisey simple take the sensor head off until you can get time to turn it the correct way round

 

[mike42]

2 incredibly useful replies - thanks very much !

 

[Johntheo5]

I've allways installed mine horizontally, on the return, as I think they get a more accurate room temperature this way, also, when only unidirectional TRVs were available the flow was/is correct installing them this way. I still feel that even the bi directional ones work best where the flow comes from under the valve seat which means installing them vertically on the inlet or horizontally on the return.

 

[ianmcd]

I've allways installed mine horizontally, on the return, as I think they get a more accurate room temperature this way, also, when only unidirectional TRVs were available the flow was/is correct installing them this way. I still feel that even the bi directional ones work best where the flow comes from under the valve seat which means installing them vertically on the inlet or horizontally on the return.

It is a straight through TRV for probably a towel rail