What is the primary function of a backflow preventer?

The primary function of a backflow preventer is to prevent the reverse flow of contaminated water into the clean water supply. It is a crucial device in plumbing systems designed to maintain the integrity of potable water sources. Backflow can occur due to changes in water pressure, which can potentially allow dirty or contaminated water from industrial systems, irrigation systems, or other non-potable sources to flow back into the clean supply, posing health risks to the public.

The construction of backflow preventers often includes mechanisms such as check valves and air gaps that ensure that water only flows in one direction, thereby securing the safe and clean water delivery to homes and businesses. The effectiveness and reliability of backflow preventers are vital in preventing waterborne diseases and ensuring compliance with health and safety regulations regarding drinking water standards.