I am renting this apartment, so i rather keep the Work as less invasive as possible.
I have several single pipe steam radiators (could as well be the cast iron type). One of the radiators heats up at the control Steam Valve pipe section that comes in, and at most will barely heat 1 or 2 sections of the total 9 radiator sections.
The radiator was standing flat with no angle to it, so i have added a couple shims to angle the radiator towards the pipe. No change observed.
If i remove the air valve (located on the opposite side of the steam valve, midheight of the radiator), the radiator heats up very slowly, but only about 4 sections get warm. I'm reluctant of keeping the air valvle off all the time.
In sat next to the radiator when it was heating, and did hear a bubbling sound similar to when water drains in the shower.
This makes think that there is water or sludge stock at the Steam Valve. As i mentioned before, i rather not unplug the pipe/radiator, and wondering if there are any simple maintenance steps that potentially can remedy a situation like this?