1 / 40

Backflow Preventers

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.

amina
Download Presentation

Backflow Preventers

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

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

More Related