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Time to breathe out

We don't like cold air in our boiler in the morning, lets see how we clear it
If you have ever worked a very old machine, you will have noticed that when you started the machine up the first thing in the morning, and then patiently awaited for it to reach operating temperature, that the first time you operated the steam valve, all you got was a gush of cold air, and then you had to wait around again for the machine to heat up. Trying to ignore the irate customers!
Having to vent the machine the first thing before service was caused by the boiler dropping in pressure over night and the remaining steam causing a vacuum. When you first then switched the machine on, this positive vacuum made the pressure switch think it was up to temperature.

Lucky for you, the manufactures solved this little problem.
They came up with a simple little device called the Anti Vacuum Valve, that vented the boiler during the night as the the machine cooled down, and then as the pressure built up in the boiler, the valve closed itself.

As with all things, they do come in various shapes and sizes, some very high end machines might use an electrical valve to vent the machine.
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