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A vacuum breaker is a device that prevents water from being siphoned backward in a direction it is not desired to go. They are commonly placed on a bibcock valve or toilet or urinal flush valve , in which application they can prevent hose or drainage water from back-siphoning into the public drinking water system.
Inside this elbow is a poppet valve that is held "up" by the water pressure found in the system, closing the air entrance to the device. If the pressure in the "upstream side" is reduced to atmospheric pressure or below, the poppet valve drops and allows air to enter the system, breaking the siphon. [1]
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. This makes it acceptable for applications that are high hazard or where valves are ...
Vacuum valve may refer to: Trickle valve, a type of airlock; Vacuum breaker, an anti-siphon valve; Vacuum delay valve, an automobile component; Vacuum tube, an electron tube or thermionic valve; Vacuum interrupter, an electrical device acting similar to a circuit breaker, used in higher voltage applications
Thermal shut off valve or Thermally released shut off valve, protects against excessive temperature, mandatory in the gas installation of some countries; Trap primer: sometimes include other types of valves, or are valves themselves; Vacuum breaker valve: prevents the back-siphonage of contaminated water into pressurized drinkable water supplies
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