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1 radiator banging time to replace?
1 pipe system with 6 steam radiators in 1920's era row house (Washington DC). System is quiet sans one large radiator. The upstairs radiator has a consistent bang when it comes online. 5 progressively louder bangs and then it stops. I made sure there is good tilt on the problem radiator to ensure drainage and it heats evenly with the rest of the house. Valve is all the way open. Seems to me given the length of the radiator (long as two windows) it could have a low spot in it. I've tried adding more tilt but that has not helped.
Curious if I'm missing anything in my troubleshooting? Could it be the valve?