Vacuum Breaker

A vacuum breaker is an attachment commonly placed on a bibcock valve or toilet or urinal flush valve, that prevents water from being siphoned backward into the public drinking water system. This prevents contamination should the public drinking 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.

Vacuum relief valves are sometimes known as vacuum breakers.

Other articles related to "vacuum breaker, vacuum breakers":

breaker" class="article_title_2">Pressure Vacuum Breaker
... A pressure vacuum breaker (PVB) is a type of backflow prevention device, used to keep non-potable (or contaminated) water from entering the water supply ... A PVB is similar to an atmospheric vacuum breaker (AVB), except that the PVB contains a spring-loaded poppet ... Pressure vacuum breakers must be protected from freezing when installed outdoors ...

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