What is the function of a backflow preventer in plumbing systems?

The function of a backflow preventer in plumbing systems is to prevent contamination of potable water. This device is crucial in maintaining water quality and ensuring that safe drinking water is not polluted by water from non-potable sources.

Backflow can occur when there is a change in water pressure, which may cause water to flow backward into the drinking water supply, bringing with it harmful contaminants, chemicals, or pathogens from other systems. A backflow preventer is designed to automatically stop this reverse flow, thus protecting the integrity of the potable water system.

By ensuring that water flows only in the intended direction, backflow preventers are essential for public health and safety. They are commonly found in irrigation systems, medical facilities, and industrial settings where there is a risk of cross-connection between potable and non-potable water sources.