drayton thermostatic valve fitting direction

[dukeinlondon]

we've had 2 new radiators fitted with thermostatic valves and in both cases, the plumber has put the valve on the return side rather than on the flow side. Am I right in thinking this is wrong and that it should refit the valve on the flow side as all our other radiators are done ?

Thanks in advance

 

[Bahco]

They may be bi directional so it wouldn't matter.
You will hear them chattering if they was on the wrong end

 

[PEDANTICVINDICTIVEMAN]

They hiss less when fitted on the return, as long as the arrow faces direction of flow or they are bi sexual, you know, go both ways

 

[dukeinlondon]

Thanks for the answers. They go both ways. The problem is that one of the radiators is a towel rail and the valve, being on the return, only shuts when the radiator is full. By that time the thing is too hot to touch.

 

[PEDANTICVINDICTIVEMAN]

T/valves are to control room temperature, not the temperature of the water going into the radiator.