What Is a Vacuum Breaker?
A Vacuum Breaker is a backflow prevention device that stops contaminated water from being pulled into a clean water supply. The device admits air when water pressure drops or flow reverses. Vacuum breakers commonly protect hose connections, irrigation lines, boilers, and other outlets where backsiphonage could affect drinking water.
Quick Facts About Vacuum Breaker
Category
Backflow prevention device
Used for
Stopping backsiphonage
Common confusion
Not every backflow preventer is a vacuum breaker
Also called
Atmospheric Vacuum Breaker, Backsiphonage preventer
Often discussed with
Backflow Testing
Key Takeaways About Vacuum Breaker
- It responds to a drop in water pressure.
- It protects against backsiphonage at connected outlets.
- It is not the same as every backflow preventer.
How Vacuum Breaker Works
Vacuum breaker operation begins when water pressure falls or flow reverses. A spring-loaded check member moves away from its seat, and an air opening lets air enter the passage. The added air breaks the suction that could draw water backward.
Related glossary terms: Backflow Preventer, Pressure Reducing Valve, Air Gap.
Many vacuum breakers sit on hose bibbs, irrigation piping, or equipment connections. A hose bibb vacuum breaker protects the supply when a hose rests in a bucket, sink, or other water source. A vacuum breaker doesn't stop every type of backflow, so the device must match the connection and hazard.
Expert Note
When we check a vacuum breaker during backflow testing, we inspect its body, air inlet, and shutoff action. We also look for debris, corrosion, leaks, or a connection that could defeat the device. Our team records how the assembly responds during the test.
Vacuum Breaker in Practice: A Real-World Example
A garden hose fills a bucket that contains cleaning water. If supply pressure drops, the vacuum breaker admits air and helps keep that water from being drawn into the home's supply line.
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