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Refitted a radiator after decorating but didn't get any heat to it. Realised it was the lockshield valve closing when I refitted the cap (it screws into the valve).
Cap looks like this:
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Is there a special way to tighten this cap without closing the valve?
try screwing the screw in while holding the valve head with some pliers without the plastic cap a few times to loosen off the threads so that the friction of the valve is greater than the friction of the screw threads. Maybe even a drop of oil. Then refit and gently screw the screw in with the cap in place.
Thanks, will give that a go tomorrow.
You squashed the outside when you turned it off didnt you.?
Have a look and you will see the hole is now oval.
Lightly work it back to round.
Done it myself 100's times, easy mistake.