A backflow preventer** is a critical plu MP3音声抽出 (320kbps) - TokVibe - Download TikTok Video No Watermark & MP3

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A backflow preventer** is a critical plumbing safety valve that stops contaminated water from reversing flow and polluting the clean municipal water supply. ### Key Takeaways * **Primary Purpose:** Protects potable drinking water from hazardous cross-contamination caused by backpressure or backsiphonage. * **Common Mechanical Types:** * *Reduced Pressure Zone (RPZ):* Best for high-hazard applications; includes a relief valve. * *Double Check Valve Assembly (DCVA):* Used for moderate hazards like irrigation or fire sprinklers. * *Atmospheric Vacuum Breaker (AVB):* Used for non-continuous pressure applications to prevent backsiphonage. * **Maintenance:** Requires mandatory annual testing by a certified professional to inspect springs, seals, and internal check valves for wear.

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