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Did i ruin my radiator air vents?

About a month ago I spent a non-trivial sum replacing all of the air vents on my single pipe steam radiators. I went on vacation for two weeks, and while I was gone I turned my thermostat down to 55 to save on the gas bills. I got home yesterday and turned the heat back up to 65. The boiler cranked for a really long time and radiators around the house started hissing, not closing off, and just venting steam. I figured the boiler pressure was too high, so I cut the heat and things settled down. Unfortunately now some of them seem to be stuck open and continue to vent steam. Are they completely trashed? Was it because of too much pressure? I really don't want to spend $20 per vent to replace them again, but if that's what it comes to I'll chalk it up as a learning experience and figure out how to not let it happen again.

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