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Backflow Preventers. Cross Connection. Direct arrangement of piping which allows the potable water supply to be connected to a line which contains a contamination. Can create a health risk. Types of Backflow. Backpressure Back-siphon age. Backpressure.

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Backflow Preventers


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    Presentation Transcript
    1. Backflow Preventers

    2. Cross Connection • Direct arrangement of piping which allows the potable water supply to be connected to a line which contains a contamination. • Can create a health risk

    3. Types of Backflow • Backpressure • Back-siphon age

    4. Backpressure • The reversal of normal flow in a system due to an increase in downstream pressure that is above the supply pressure

    5. Backpressure • Normal flow in a system.

    6. Backpressure • Increase in downstream pressure changes flow.

    7. Backpressure • Customers complained of bitter taste in the soft drinks. • Over 300 people were served during this period.

    8. Back-siphon age • The reversal of normal flow in a system caused by a negative pressure or vacuum in the supply piping.

    9. Back-siphon age • Normal flow in a system.

    10. Back-siphon age • reversal of normal flow in a system caused by a negative pressure

    11. Back-siphon age • Exterminator left hose in dilution during service. • Water department repairing a water line.

    12. Types of Backflow Preventer • Air Gap • Double Check Backflow Preventers • Double Check Detector Preventers • Reduced Pressure Backflow Preventers • Silent Check Valves • Hose Bib Vacuum Breakers • Anti-siphon Vacuum Breakers

    13. Air Gap • Industrial processing applications • Rarely used in plumbing systems

    14. Double Check Backflow Prevention Assemblies • FDC Series • Used as a protection of all direct connections through which foreign material might enter the potable system in concentration which would not constitute a health hazard. • 1/2” – 10” Devices

    15. 1/2” – 2” FDCDouble Check Backflow Prevention Assemblies • Bronze Bodies • Will also offer Low Lead for California Market.

    16. 1/2” – 2” FDCCheck Valve Assembly

    17. 1/2” – 2” FDCCheck Valve Assembly

    18. 1/2” – 2” FDCCheck Valve Assembly

    19. 2 1/2” – 10” FDCDouble Check Backflow Prevention Assemblies • Ductile iron bodies with epoxy coating

    20. 2 1/2” – 10” FDCCheck Valve Assembly

    21. Double Check Detector Assemblies • DCDA Series • Incorporates a meter to detect and measure leaks and unregulated usage • 2 1/2” – 10” sizes

    22. Reduced Pressure Backflow Prevention Assemblies • FRP Series • Used on all direct connections where there is the possibility of contamination by a substance that has a potential health hazard • 1/2” – 10” Devices

    23. 1/2” – 2” FRPReduced Pressure Backflow Prevention Assemblies • Bronze Bodies • Will also offer Low Lead for California Market.

    24. 1/2” – 2” FRPRelief Valve Assembly

    25. 1/2” – 2” FRPRelief Valve Assembly

    26. 2 1/2” – 10” FRPReduced Pressure Backflow Prevention Assemblies • Ductile iron bodies with epoxy coating

    27. 2 1/2” – 10” FRPCheck Valve Assembly

    28. 2 1/2” – 10” FRPRelief Valve Assembly

    29. 2 1/2” – 10” FRPRelief Valve Assembly

    30. 2 1/2” – 10” FRPCheck Valve Assembly

    31. Silent Check Valve • CV Series • Low Lead devices • Available in Threaded or Sweat applications

    32. Hose Bib Vacuum Breaker • HBVB Series • Used wherever there is a possibility of a hose being attached which could be introduced to a contaminant. • Attach to sill cocks and threaded faucets • Available in Rough Brass or Chrome Plated

    33. Anti-siphon Vacuum Breaker • ASVB Series • Incorporates an atmospheric vent in combination with a check valve. • Cannot be used under continuous pressure • Attach to sill cocks and threaded faucets • Available in Rough Brass or Chrome Plated

    34. Anti-siphon Vacuum Breaker • ASVB Series • Typical installation

    35. Pressure Vacuum Breaker • PVB Series • Used in systems to protect from cross-connection where it is not subjected to backpressure • Can be used under continuous pressure

    36. Pressure Vacuum Breaker • PVB Series • Typical installation