Two radiators making noise

[Michaelsf90]

Two radiators upstairs are quite loud when the heatings on. Only way i can describe the noise is it's as if you can hear the water rushing through the radiator. Like when you have a tap on and you can hear water rushing through the pipes in another room

All the radiators are new and the boiler is two and a half years old. I must admit I've only noticed it since we've had radiators changed. What is it that causing that noise?

 

[terryplumb]

Pity we can't hear it . We may be able to pass constructive opinion if we could. As a wild guess I would say the water passing through the rad needs to be restricted. If you close down TRV to mid position ,does it get quieter ?

 

[Michaelsf90]

In the one in the bathroom it's just a lock shield valve. If I close that the noise is even louder! In the bedroom if I close the lock shield the noise stops. Its the same in the kitchen. Any small radiators seem to have this noise of water flow coming from them. The large radiators downstairs dont. It's more the upstairs ones. Is the pump too powerful?