Vibrating pipes / Radiator valves

[louisehs]

We have a Worcester Bosch combi boiler (24i RSF) with which we had no problems until we had thermostatic radiator valves fitted last December (Honeywell VT117E Bi-directional) to all radiators excluding the one in the bathroom. When the heating comes on in the morning, after approx 45 mins we get a terrible banging noise ( I think it's the pipes, my other half thinks it's the rad valves). This isn't always from the same radiator. This can be stopped by tweaking a rad valve, not always the same one, usually by increasing the flow through it. When it first started happening we tried bleeding all the radiators which didn't help.
Any help would be much appreciated as I need as much beauty sleep as I
can get.
We don't appear to get the same problem when the heating comes on in the evening - we are at work then but we don't hear anything at the weekend.

 

[ChrisR]

find out which is thr flow end (gets hot first) and see if the valves are at that end or not - does it correlate with the bang?

 

[kevplumb]

sounds like the valves chattering when they close

 

[louisehs]

find out which is thr flow end (gets hot first) and see if the valves are at that end or not - does it correlate with the bang?

After dashing round the house this evening I can now tell you the radiators we have a banging problem with have their valves at the opposite end of the radiator to where the hot water comes in

 

[louisehs]

sounds like the valves chattering when they close

Is there a solution to stopping the valves chattering?

 

[kevplumb]

change the valves to other ends