I have some new radiators (they're Kudox) and some Honeywell TRVs, which come with a tail to screw into the radiator, and then the valve fastens to the tail with a nut and olive.
I understand that the olive, not the thread, makes the waterproof join, and many people say don't bother to wrap the olive with PTFE - it's a waste of time and certainly don't wrap the thread with it, as the thread just provides the compression, not the seal.
So how does the tail form a water tight seal in the radiator? There doesn't seem to be anything except the thread, and I can tighten to a certain point and then no more. I have wrapped these threads with PTFE, but I'm curious about how the seal is formed.
I understand that the olive, not the thread, makes the waterproof join, and many people say don't bother to wrap the olive with PTFE - it's a waste of time and certainly don't wrap the thread with it, as the thread just provides the compression, not the seal.
So how does the tail form a water tight seal in the radiator? There doesn't seem to be anything except the thread, and I can tighten to a certain point and then no more. I have wrapped these threads with PTFE, but I'm curious about how the seal is formed.