Today I have been fitting a Danfoss RAS-D2 Combi 8/10/15 TRV, when I installed a new radiator in a different position. The size of the pipe used in the installation is 8mm. This is the first time that I have come across this particular type of valve.
If any of you knowledgeable types out there are familiar with this valve, perhaps you can tell me if the collar which forms the 8 mm olive reducer, is supposed to be soldered on to the pipe. I found that if it was not soldered, even when the chrome compression nut was done up really tight the 8mm pipe could still be swivelled by hand. There is no way it would have held water. In the end I soldered the ring with the 8mm taper adapter, on to the pipe. Now the pipe can be done up tight, so that it will not swivel. There are no instructions with the valve to indicate the correct assembly of these different adapters. Any informed comments would be much appreciated.
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