What is the primary function of an atmospheric vacuum breaker?

The primary function of an atmospheric vacuum breaker is to prevent back-siphonage. This device is designed to maintain a physical air gap in the water supply system, which is crucial for stopping contaminated water from being siphoned back into the clean water supply. When a drop in pressure occurs in the supply line, an atmospheric vacuum breaker automatically allows air to enter the system, breaking any potential siphon and preventing backflow.

This is particularly important in irrigation systems where there is a risk of chemicals or fertilizers in the irrigation water being drawn back into the potable water supply. The device achieves its purpose without relying on mechanical or moving parts, making it a simple yet effective solution for ensuring safe drinking water.

While regulating water flow, filtering contaminants, and monitoring water pressure are important aspects of irrigation systems, they do not address the specific critical function of back-siphonage prevention that the atmospheric vacuum breaker is designed for.