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Steam trap /vacuum system question
We operate a low pressure boiler on a vacuum system with perimeter radiation. I’m having a hard time understanding something. How is the steam able to pass through a radiator while the steam trap/vacuum side is in the closed position? With the steam trap closed is the radiator itself in a deep enough vacuum from start up to pull the hot steam through until it condenses, falls, hits the trap, and the trap opens? Any insight will be greatly appreciated.