What is a backflow preventer?

What is a backflow preventer?

• A. A device used to filter water.
• B. A valve that vents gas.
• C. Device designed to keep the backward flow of fire system water into the potable water system.
• D. A gauge to measure pressure.

Answer: (C)

Backflow prevention keeps fire system water from flowing back into the potable water supply. A backflow preventer is installed at cross-connections to stop any reverse flow that could bring contaminated or dirty water into the drinking water system, especially during pressure drops or backpressure situations. It often uses check valves and may include a relief mechanism to ensure water can only move in the intended direction, protecting public health and meeting fire protection code requirements. Other options don’t fit because filtering water is about removing particulates, venting gas is not related to water supply protection, and a gauge simply measures pressure.

Backflow prevention keeps fire system water from flowing back into the potable water supply. A backflow preventer is installed at cross-connections to stop any reverse flow that could bring contaminated or dirty water into the drinking water system, especially during pressure drops or backpressure situations. It often uses check valves and may include a relief mechanism to ensure water can only move in the intended direction, protecting public health and meeting fire protection code requirements.

Other options don’t fit because filtering water is about removing particulates, venting gas is not related to water supply protection, and a gauge simply measures pressure.