which is which , flow and return?

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which is which , flow and return on a rad,I thought the lockshield on the right of a rad (the smaller one) is the flow?
ben
 
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Conventionally the adjustable valve goes on the flow but it doesn't matter.
Older TRV's had to go on the flow end.
 
cheers for the swift answer chris,so is the flow on the right?
whats easiest way to remember r for return on right etc
ben
 
Pipe that gets hot first is flow lockshield should be on return
 
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