What type of device is an atmospheric vacuum breaker?

An atmospheric vacuum breaker is a specific type of backflow prevention device designed to protect potable water supplies from contamination due to backflow. It operates by preventing negative pressure that can create a siphon effect, which could draw potentially contaminated water back into a clean water supply. When pressurized water flows through the device, the internal mechanism allows air to enter if a drop in pressure occurs, thus breaking any vacuum that could otherwise cause backflow.

Understanding its function is crucial for maintaining water quality and safety in irrigation systems and plumbing. The atmospheric vacuum breaker is specifically engineered for use in specific applications where backflow could pose a risk, making it an essential component in irrigation practices that comply with health regulations.