Radiator doesn't heat, steam gets to valve, and occasionally will heat top of 1st section. Have had valve replaced with Mepco orificing. Radiator is on 2nd floor run off riser, only one heated off it. System is running on 2-3 oz of pressure with vaporstat, but even when I had pressuretrol, still didn't heat. converted from oil to gas, and rad has always been under performer.
pipe opposite supply riser using stethascope, sounds like faraway toilet or gravel sand with occasional thump or sound like muffled thud, not metalic. Haven't removed tube yet, will do tomorrow, but had to get feedback on sounds in return.