Noisy TRV

[craigy]

I have a noisy TRV on one rad only which is the only TRV to be changed in the bungalow. New combi fitted to old 2 pipe system. Most of the TRVs are fitted to the returns as they were when first installed, the kitchen is the only rad to have the TRV fitted to the flow. The noise is coming from a living room rad which has been replaced with the TRV on return. Have bled and balance the system, the TRV is bi-directional. Only bangs when cooling or on setting 2-3. Changed TRV no difference.

Any ideas?

Thanks

 

[scotty plumber]

Is the arrow on the bi-directional valve facing the right way? This would be pointing away from the rad if it is on the return.

 

[SimonJohns]

Is the arrow on the bi-directional valve facing the right way? This would be pointing away from the rad if it is on the return.

It's BI directional!!!

Was that a serious question?

 

[scotty plumber]

Yes it was as on a bi-directional valve you need to adjust the arrow on the valve so that the arrow is running with the flow

 

[SimonJohns]

Yes it was as on a bi-directional valve you need to adjust the arrow on the valve so that the arrow is running with the flow

Bi directional valves can go either way. Hence the name bi

Older valves could only go one way.

Have a look at a bi directional valve and you will see an arrow pointing both ways

 

[scotty plumber]

yes i know how a bi-directional works but you still need to ensure that the adjustable arrow is going the right way this is my point ( danfoss )

 

[Billy Bob Bob]

yes i know how a bi-directional works but you still need to ensure that the adjustable arrow is going the right way this is my point ( danfoss )

scotty is right the danfos brand have a arrow that needs to be pointed the right way,however most bi valves can be fitted either way with no adjustment to the OP if the trv has been replaced try opening the locksheild valve slightly see if this helps if not try swapping to a different make trv

 

[SimonJohns]

scotty is right the danfos brand have a arrow that needs to be pointed the right way,however most bi valves can be fitted either way with no adjustment to the OP if the trv has been replaced try opening the locksheild valve slightly see if this helps if not try swapping to a different make trv

What's the point in it being bi directional if you have to fit it in the right direction?

 

[Billy Bob Bob]

What's the point in it being bi directional if you have to fit it in the right direction?

theres a arrow on the head of the danfos you just turn by hand when fitted it supposedly eliminates this problem,even though all bi valves should do what they say on the box every now and then you will get some that dont

 

[WaterTight]

You can have it in any colour as long as it's black.