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How to tell direction of flow for new radiator

Joined
22 Oct 2023
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I took off the radiator last year in my living room to decorate and have purchased a new one of a different size. It comes with a diverter spring and TRV and instructions say it needs to be on the flow side. The problem is I can't tell which the flow side is, as the pipes to the old radiator (that have been capped off) are both cold when I turn the heating on. I have pulled up a few floor boards and felt the pipes underneath but the pipes are still cold both sides. Is there another way to tell?
 
Not sure it will work but if you hold the tip of a screw driver to both pipes and hold your ear to the handle I would think the flow might have a louder rumble.
 
just a DIYer , but i have changed a few radiators at my home and for others , I get TRV valves that are bi-directional, from screwfix or toolstation in past (often comes with radiator)
whats the diverter spring for , is this a very high radiator ? - i think over 1000mm
my post - may not be helpful as just a DIYer
 
just a DIYer , but i have changed a few radiators at my home and for others , I get TRV valves that are bi-directional, from screwfix or toolstation in past (often comes with radiator)
whats the diverter spring for , is this a very high radiator ? - i think over 1000mm
my post - may not be helpful as just a DIYer

It's the rad that needs to have baffle on flow. Nothing to do with trv.
 

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