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Still getting to know the steam heat in my new (to me) old house.
Several of the radiators appear to at one point had 2 pipes going to them (there are telltale holes in the floor that were plugged/filled at one point)...and some still do.
None of them have valves on them, but they all have air vents.
I am wondering if what appear to be just 90 degree elbows are actually steam traps.
In the attached pictures, the first 3 are of a radiator with a capped return. The last 2 are of a radiator with the return still plumbed.
I keep finding crazy hacks on these...like the radiator in the kitchen that had a hot water bleeder valve installed...with a hole drilled in the side of it to make a really big "vent".