On 19/12/2012 23:30, Roger Mills wrote:
On 19/12/2012 22:10, John Rumm wrote:


It does depend on the valve though... some have a traditional cone joint
where the nut is retained on the rad tail and screws onto the valve.
More recently the tails seem to simply have a protruding length of
chromed 15mm Cu pipe, and the valve in effect has a normal compression
fitting that tightens onto the pipe stub. Needless to say they undo in
the other direction.


I'm not sure what you mean by that - the "other direction" from what?

Surely, whether it's a cone joint nut or a compression nut, they both
screw onto the valve from the rad side, and both have to be unscrewed
clockwise when looking from the valve to the rad.

Yes, come to think of it I might be talking spherical objects ;-)

They are the "other way round" in the sense that the valve notionally
fixes onto the tail, rather than the tail fixing to the valve - however
the rotation direction should be the same as you highlight. (and once
fitted the backnut is still captive on the rad due to the olive)...





--
Cheers,

John.

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