Visiting my son over the weekend, and looking over his heating system, noticed that a newly fitted radiator did not have a lockshield valve, but what looked like a TRV valve without the head.The other end of the radiator had a TRV as normal. I can't see quite how this allows the system to be balanced, as surely the headless valve can only be fully open? Is this there a reason for this arrangement?
TRV instead of lockshield?
- Thread starter Northman
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Style probably (or whoever fitted had a surplus of chrome TRVs).
You can use the decorators' cap (which you've removed in pic 2) to control the valve- there's only a few mm travel on that pin from off to full so 3 or 4 turns will give an adjustment range. Do hope you counted how many turns the thing was on by before you removed it, you might have cocked up the balancing now!
Balancing is less important with a trv setup- if one rad is 'robbing' all the flow it should heat that space more quickly, trv will close, more flow available for other rads.
You can use the decorators' cap (which you've removed in pic 2) to control the valve- there's only a few mm travel on that pin from off to full so 3 or 4 turns will give an adjustment range. Do hope you counted how many turns the thing was on by before you removed it, you might have cocked up the balancing now!
Balancing is less important with a trv setup- if one rad is 'robbing' all the flow it should heat that space more quickly, trv will close, more flow available for other rads.
If the cap on the valve can be rotated, it can apply pressure on the pin to manage flow (similar to a decorators cap), just as a lockshield would.
..although removing the cap, you may now have completely upset his system balance
Ahh, beaten to it!
Thank you gents! I did suspect that the cap was possibly pressing down on the pin. An interesting case of 'observer effect' where you can't know the state without changing it. As it happens, he finds it doesn't get very warm at all, so I left it as loose as possible to encourage flow. Its an old house, and there seems to be at least three stages of evolution in the heating system, so I suspect the whole thing is sub-optimal.
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