The Clapper Valve:

The Clapper Valve:

• A. Prevents water from entering the system.
• B. Prevents water from reentering the Public Water Supply.
• C. Prevents water from entering noninvolved areas.
• D. Protects the system from water surges.

Answer: (B)

The Clapper Valve is a backflow prevention device. It acts as a one-way valve on a fire service line, allowing water to flow toward the building but closing to stop water from flowing back into the public water supply. When pressures try to reverse or drop on the supply side, the clapper seats and blocks that backflow, protecting the municipal system from contamination. That makes the correct description: it prevents water from reentering the Public Water Supply. The other options don’t describe the valve’s main purpose—backflow prevention into the public system isn’t about keeping water out of the system itself, shielding noninvolved areas, or specifically guarding against surges.

The Clapper Valve is a backflow prevention device. It acts as a one-way valve on a fire service line, allowing water to flow toward the building but closing to stop water from flowing back into the public water supply. When pressures try to reverse or drop on the supply side, the clapper seats and blocks that backflow, protecting the municipal system from contamination. That makes the correct description: it prevents water from reentering the Public Water Supply. The other options don’t describe the valve’s main purpose—backflow prevention into the public system isn’t about keeping water out of the system itself, shielding noninvolved areas, or specifically guarding against surges.