Backflow prevention device

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A backflow prevention device is used to protect water supplies from contamination. Many types of backflow devices also have ports so that they can be tested or examined to ensure that they are functioning properly.

In this situation, dirty water from the hillside pool will back siphon or back flow down the hosepipe and into the clean water tank. To prevent this from happening, the house's external tap should be fitted with a backflow prevention device.

[edit] Partial list of some backflow prevention devices

• Air gap
• Atmospheric vacuum breaker (AVB)
• Chemigation valve (primarily used in agriculture)
• Double check valve, or double check assembly (DCA)
• Pressure vacuum breaker (PVB)
• Reduced Pressure Zone Device (RPZD), or reduced pressure principle device

[edit] External links

• IAPMO
• Drinking Water & Backflow Prevention magazine
• ICC
• ASSE
• United States Patent 7,033,163 - Backflow prevention device
• The American Backflow Prevention Association

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