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You're right - but I'm lazy and wanted to avoid draining down having just done so to fit a new cylinder! Anyway, I was given suggestion to gently tap side of valve with all other rads turned off and pump running and it worked!! However, there is new corrosion inhibitor in. Many thansk.

Can anyone suggest how to free a stuck (off) Drayton thermostatic rad valve? and/or does anyone know how they are put together? i.e. when you remove thermostatic capsule there is a round piece of brass held into the valve housing with a circlip. In the middle of this piece of brass is a small...