Backflow Prevention Practice Exam

Which of the following is a common type of backflow prevention device?

1. Pressure tank

2. Check valve

3. Flow meter

4. Water softener

The correct answer is: Check valve

A check valve is a common type of backflow prevention device because it is specifically designed to prevent the reverse flow of water in a plumbing system. By allowing water to flow in only one direction, check valves protect the clean water supply from contamination due to backflow, which can occur when there is a sudden drop in pressure or a change in flow direction. This function is crucial in protecting public health and maintaining the integrity of the potable water supply. Pressure tanks, flow meters, and water softeners serve different purposes. Pressure tanks manage water pressure and flow within a system, flow meters measure the quantity of water passing through a pipe, and water softeners are used to remove minerals that cause water hardness. While these devices are important in water treatment and distribution, they do not serve the specific function of backflow prevention like check valves do.