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What is a common indication of a faulty check valve in a backflow prevention assembly?

  1. Increased water pressure

  2. Continuous flow in reverse direction

  3. Air stagnation in pipes

  4. Rust formation in fittings

The correct answer is: Continuous flow in reverse direction

A common indication of a faulty check valve in a backflow prevention assembly is continuous flow in the reverse direction. Check valves are designed to allow water to flow in one direction and prevent it from flowing back. If the check valve fails, it won't close properly, allowing water to flow backward through the system. This situation can lead to potential contamination of the potable water supply, as non-potable water or contaminants can enter the system from areas that should be isolated. Identifying continuous reverse flow is crucial because it highlights the check valve’s failure to perform its primary function, ensuring that water moves only in the intended direction. Monitoring for this condition is essential for maintaining the integrity of a backflow prevention system and protecting public health.