I have a two pipe system with a Hoffman #76 main vent. The radiators do not appear to have traps on the radiators, but there seems to be a trap at a connection between the supply lines and the return lines.
The vent doesn't seem to release the air very quickly, and a couple of radiators on the second floor do not heat very well. I was considering replacing the main vent with a Gorton #2 to see if it would help, but wasn't sure it was the right decision. Any insight would be appreciated.
I have attached pictures of one of the radiators below, as well as of the system vent.