On 17/02/2013 08:02, Tim+ wrote:
Caecilius wrote:
On Sat, 16 Feb 2013 18:13:33 -0000, "Nick"
wrote:
Would there be any plastic/rubber components within? Heat might
damage these.

Yes, I suspect there may be heat sensitive stuff inside, so I'm
wary of using a blowtorch.

What about cleaning thoroughly with wire brush, and a few taps
around the periphery with a toffee hammer. Then a few drops of
Plus-Gas or similar at the joint, leave to soak and repeat as
seems fit. I can't imagine WD40 having much effect. A few drops
isn't going to greatly contaminate the system.

Then a well fitting ring spanner and give it a decent thump
whilst bracing adjoing pipework.

I wish I could use a proper spanner, but it's about 40mm (or one
and a half inches) across the flats, so I don't have a spanner that
would fit. And most spanners only seem to go up to about one inch
anyway. So I need to use an adjustable, which is not the best thing
for these circumstances.

If all else fails, and I hesitate to say
this.............................................. .............angle


grinder.

No, stilsons come before angle grinder surely.

Can you soak a rag in descaler (vinegar maybe) and drape it over the
valve? Maybe wrap it in cling film to stop it drying out.

Tim



Do acids dry out? IIRC the stronger ones at least get wetter when
exposed to the air