Define backflow prevention in the context of flame effects gas lines.

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Backflow prevention in flame effects gas lines means stopping gas or flame from moving backward toward the fuel supply or other parts of the system when conditions change, such as a flame going out or pressure shifts. A device like a check valve or an interlock is used because it only allows forward flow toward the burners and automatically blocks any reverse movement. This protects the fuel source, control equipment, and the rest of the system from unwanted ignition or gas buildup by preventing backward travel. The other descriptions don’t provide reliable reverse-flow protection: letting gas flow in any direction lacks a safeguard against backflow; trapping gas toward the supply doesn’t prevent reverse movement through the system; and a manual valve that’s always open cannot stop gas from moving backward in fault conditions.