Replaced two Radiators, been told we now need to replace pipes feeding radiators…

Another question time (sorry) I was reading that the ideal temp difference between the in and out should be 12 degrees?

So if going in, it’s say 58, and coming out it’s 32, is that within normal range, or would I open or close the lockshield a bit to adjust?
 
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Closing the lockshield down sounds wrong to me. If the input is 58 and the output is 32 then surely there is too little water flow through the radiator as it is radiating away 26 degrees by the time it leaves. I would think opening the lockshield valve would allow the water to get from the input to the output quicker and thus radiate less of it's heat away by the time it leaves. If it's 58 on the input you should be aiming for 46 on the output.
 

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