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What is the purpose of a vacuum breaker valve in a steam heater control system?
A vacuum breaker valve is recommended on the steam inlet line near the Compabloc steam inlet. It helps avoid a sudden vacuum inside the unit, for example due an emergency shut down and a sudden closure of the steam inlet valve. If the steam inlet valve is closed suddenly, air will be admitted in the steam inlet line tol avoid vacuum inside the heat exchanger.
See the user manual Compabloc IOM Manual.pdf for more details.