Which statement about backflow devices is true?

Which statement about backflow devices is true?

• A. Backflow devices increase water flow.
• B. Backflow devices create additional pressure head.
• C. Backflow devices reduce noise.
• D. Prevent reverse flow in systems.

Answer: (D)

Backflow devices are placed to stop water from flowing backward into the potable water supply when pressure changes or cross-connections exist. Their main job is to create a barrier that prevents reverse flow, which protects drinking water from contamination coming from the sprinkler system or other non-potable connections. They don’t purposefully increase flow or add useful pressure head; in fact, they can cause some pressure loss as water passes through the device. Noise reduction isn’t their function either. In low-rise residential sprinkler systems, ensuring no reverse flow is essential to keep the public water supply safe.

Backflow devices are placed to stop water from flowing backward into the potable water supply when pressure changes or cross-connections exist. Their main job is to create a barrier that prevents reverse flow, which protects drinking water from contamination coming from the sprinkler system or other non-potable connections. They don’t purposefully increase flow or add useful pressure head; in fact, they can cause some pressure loss as water passes through the device. Noise reduction isn’t their function either. In low-rise residential sprinkler systems, ensuring no reverse flow is essential to keep the public water supply safe.