- Vacuum breaker
A vacuum breaker is an attachment commonly placed on a
bibcockvalve or toilet or urinalflush valve, that prevents water from being sucked backward into the public water system. This prevents contamination should the public water system's pressure drop.
A vacuum breaker typically contains a plastic disc that is pressed forward by water supply pressure, and covers small vent holes. Should the supply pressure drop, the disc springs back opening the vent holes (which let in outside air), and preventing backflow of water.
A more complex valve that accomplishes much the same purpose is the backflow preventer.
relief valves are sometimes known as vacuum breakers.
* [http://www.spiraxsarco.com/resources/steam-engineering-tutorials/pipeline-ancillaries/gauges-sight-glasses-vacuum-breakers.asp#head25 Vacuum Breakers Tutorial] Vacuum breakers protect plant and process equipment against vacuum conditions, typically associated with cooling.
Atmospheric vacuum breaker
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