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24/7 on no vacuum breaker

Postby shalenkur on Sun Jan 30, 2011 4:25 pm

could someone verify my understanding:

If a machine with no vacuum breaker is left on 24/7, the absence of a vacuum breaker is a non-issue because the boiler is always under pressure, right?
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Postby another_jim on Sun Jan 30, 2011 5:38 pm

That's right.

The vacuum breaker opens to the outside air when the boiler is cold, and closes as the water boils. Preventing a vacuum is not really its job; a boiler can easily stand up to vacuum. Instead, it allows the steam to push out the air and fill the boiler, so the boiler pressurizes with steam and heats correctly; rather than pressurizing with trapped air and not heating above boiling point.
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Postby shalenkur on Sun Jan 30, 2011 6:08 pm

Thanks Jim
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