10mm copper tube and adapters to 15mm TRVs

[Lobster]

I need to do some work on the CH system shortly (adding/moving a radiator and swapping out a faulty TRV). Turns out that I already have a spare, boxed TRV at home (sized for 15 mm only) however the new ones I'm fitting are both going to be on 10mm tube.

Now, also in my Useful Box I find I have various little brass adapters for 15-10 mm tube; these were provided along other TRVs I've bought and fitted in the past (they'd have been sold as suitable for 15/10mm, but fitted on 15mm tube so the adapters were superfluous then.

Question, is, are these adapters entirely generic, or are they intended for use only with the specific TRV they were packaged with? They certainly *seem* to fit - why wouldn't they, as effectively they just take the place of standard 15mm olive when used with standard 10mm tube? However, if I'm wrong I'll only find out after I've refilled and recommissioned my CH system, with new inhibitor, so it's not worth my while getting it wrong.

Thanks David

[fred]

In article , Lobster writes

A generic solution would be a reducing set:

For a 10-15mm set, this would contain a 10mm olive to seal the pipe to the inner of the reducing set (the 2 parts of which pinch it up when tightened) and the outers of which seal against the face on the TRV where the outer of a 15mm olive would seal.

If what you have provides those functions I'd say generic, otherwise I'd say post a pic ;-).

[Graham.]

This is a job on my Round Tuit list.

Is this any help?

[harry]

There are various adaptors to go between tube sizes. If they fit, they are OK for anything. Put some PTFE tape on the olives/ working bits if you are worried about leaks, can't do any harm.

[John Stumbles]

Reducing sets are (IME) the spawn of the devil.

[newshound]

+1

[Roger Mills]

I would fit a short[1] length of 15mm pipe to the valves and then use 15 to 10 solder reducers at the other end of those.

[1] If the pipes run under floorboards, I'd go through the floor with 15mm, and fit the reducers under the floor. 15mm pipes are much more robust when they have arguments with vacuum cleaners, etc.