What is backflow preventer symbol?

The backflow preventer symbol is a graphic representation used in engineering and construction drawings to indicate the location of a backflow preventer device in a plumbing system. The symbol is usually a simple circle with a vertical line through the center, and an arrow pointing in the direction of the flow.

The backflow preventer is a mechanical device that prevents the flow of contaminated water from flowing back into a clean water supply. The symbol is used to identify the location of these devices so that maintenance and inspection personnel can quickly identify them and perform necessary tests and repairs.

Backflow preventer symbols may be color-coded to represent different types of backflow preventers, such as reduced pressure zone (RPZ) valves or double check valves. The symbol may also include additional information, such as the size and type of the device, the manufacturer, and any other relevant details.

Overall, the backflow preventer symbol is an important part of creating accurate and comprehensive plumbing system drawings, providing critical information for the safe and efficient use of water in homes, businesses, and public facilities.