The device that prevents backflow into the public water supply is called what?

The device that prevents backflow into the public water supply is called what?

• A. Back flow preventer
• B. Check valve
• C. Pressure reducing valve
• D. Air gap

Answer: (A)

Backflow prevention protects the public water supply from contamination by stopping any reverse flow in the piping. The device designed for this purpose is called a backflow preventer. It serves as a barrier against water flowing backward into the distribution system, which can happen when pressure conditions change or a cross-connection exists. The term backflow preventer is broad and covers various mechanisms that achieve this protection, such as check valves, air gaps, or pressure-based assemblies, depending on the situation. A check valve is a common component used to block reverse flow, but it’s just one type of backflow prevention device and may not cover all scenarios. A pressure reducing valve lowers downstream pressure but does not prevent backflow. An air gap provides backflow protection at a fixture by physically separating the supply from the outlet, but it’s not the standard device installed on the main supply line. Therefore, the general device whose job is to prevent backflow into the public water supply is the backflow preventer.

Backflow prevention protects the public water supply from contamination by stopping any reverse flow in the piping. The device designed for this purpose is called a backflow preventer. It serves as a barrier against water flowing backward into the distribution system, which can happen when pressure conditions change or a cross-connection exists. The term backflow preventer is broad and covers various mechanisms that achieve this protection, such as check valves, air gaps, or pressure-based assemblies, depending on the situation.

A check valve is a common component used to block reverse flow, but it’s just one type of backflow prevention device and may not cover all scenarios. A pressure reducing valve lowers downstream pressure but does not prevent backflow. An air gap provides backflow protection at a fixture by physically separating the supply from the outlet, but it’s not the standard device installed on the main supply line. Therefore, the general device whose job is to prevent backflow into the public water supply is the backflow preventer.