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Shaft is not splined. Shaft is completely smooth with no method of engaging any form of handle or key.

It's a sealed system.

Is it normal that valve spindle does not have any flats or square to allow it to be turned easily? I have never before seen such an arrangement. It is not possible to turn spindle with fingers and there is no method of using a typical valve key. I am reluctant to force spindle using some form...

That's what I thought I would do, but I was surprised to find that the spindle on the lockshield valve could not be rotated to close the valve. Normally I would expect the valve spindle to have a square end to take a key. The lack of any method to close valve is what has confused me. Is this a...

I have sent 4 pics.

Thanks for reply. I am trying to upload some pics but no success yet.

Towel rail plumbed into ch system is also fitted with electric heating element for summer heating. Need to replace element but cannot close valve to isolate radiator from ch system. Lockshield valve spindle has no square on end for key to engage. Just a round spindle! Valve is connected to...