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Single Inlet Hot Water Radiator?
So I recently purchased a home with a hot water boiler system. Many of the radiators only have one inlet to the radiator. They do have a supply and return pipe just both go to the same valve that them goes into the radiator. None of the radiator configured like this seem to get hot which makes sense to me as I can’t see how the water would be able to flow since only one entry/exit point. Attached is a photo.
Is this some sort of specialized valve or do I just need to extend the return to the other end of the radiator to allow for a path for flow?