On 16/03/2015 15:33, Andrew Gabriel wrote:
In article 2,
DerbyBorn writes:
I have never seen one with a slotted screw. Are you sure it isn't a broken
off shaft that lookes like a screw slot?

I don't think I've seen one on a radiator, but it looks the same
idea as a gas restrictor valve, commonly used to supply a gas fire
in a fireplace.

Most "lockshield" valves are ordinary valves but with a cap rather than a
knob.


I've seem something similar where the hexagonal nut locks the central
shaft - release the hexagonal nut half a turn or so to allow the screw
to turn and once adjusted tighten the nut again.

Is that lead pipe coming out of the floor?

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