identifying the lockshield valves

10 May 2006
Reaction score
United Kingdom
Recently acquired a property which has had an additional radiator installed.
System needs balancing - I am familiar with the technique to do this. However some of the other radiators' caps have been taken off. There are a few radiators where the valve at each end looks exactly the same !
How do I distinguish the difference between the 'lockshield valve' and the usual heat adjustment valve ?
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Turn the system on from cold and the pipe that heats up first will be the flow on/off, therefore other end will be lockshield.

As Harrogate says though it doesn't really matter ;)

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