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I was under the impression that each radiator had to have it's lock shield adjusted to reduce the flow and therfore hold the water in the radiator long enough for it to give its heat into the room. I read somewhere that the outlet water should be 10 deg C lower than the inlet. The system...

I have an open vented system with 17 radiators. I replaced some of the valves a couple of years ago with TRV's, replacing each main valve. Little did I know that when the house was built 10 of the radiators were installed with the lock shield valve on the feed side of the radiator. The TRV's I...