well you're going to have to drain down to fit the service valves. Might as well just drain down and paint your wall.
Alternatively while you have drained down change the tails to Hep then next time its easy to move the rad valve aside and stick on a temporary lockshield valve.
Well for a start you need to search for "valves" rather than "values" or "vales"... ;-)
Why, though? If you turn off the control and lockshield valves completely, you can just undo and remove the radiator for painting (subject to draining tha radiator of course).
Screwfix stock (or at least did) a replacement radiator tail incorporating a service valve - very neat and allegedly let you undo a radiator and remove it while still full of water. I bought a set once as a try-out, and they leaked! and I had to drain down again to replace the originals. So never again!
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