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Fire Protection

BackFlow Prevention Assembly

Backflow preventer assemblies are utilized to protect our natural resource, safe drinking water. Backflow prevention is required on applications in which there exists a possibility of contamination of the public water supply from a water user, commonly referred to as a “cross-connection”. Potential cross-connection hazards are found in potable, fire-protection, irrigation, and industrial water lines. Codes and jurisdictions require a backflow prevention device where these hazards exist; consult authorities for specific approved applications.


  • Precast concrete for below grade applications
  • Aluminum or steel for above grade applications
  • OS&Y gate valve
  • Access hatchway and safety net

System Components
All backflow assembly vaults manufactured by ParkUSA are constructed of quality precast concrete, Class I, 4500 PSI @ 28 days. Pre-casting the concrete shell insures that all units achieve structural and physical uniformity. The units are structurally engineered for H-20 truck loading (with H-20 cover if specified) and can be buried without any need for any other structural protection. The unit is of monolithic construction at bottom and walls to insure against joint leakage.

All the equipment used within the backflow assemblies are certified by one of the following associations: American Water Works Associations, American Society of Sanitary Engineering, CSA, Underwriters Laboratories, Factory Mutual, Uniform Plumbing Code, and the Foundation for the Cross-Connection Control and Hydraulic Research at the University of Southern California.

Backflow preventions required when possible contamination of public water could be found in:

  • Potable water lines
  • Fire-protection lines
  • Irrigation lines
  • Industrial water lines

Single Check

Used in a Class I or II application, Single Check Detector Assemblies are used where minimum hazards exist and where backflow assemblies are not required. The single check valve is used with a by-pass detector meter across it. See ParkUSA Model DTC. (Note that a flow alarm check and/or a single detector check, are not considered an approved backflow protection method). Single Detector Check Valve with OS&Y gate valves in a precast concrete vault with steel cover and hatchway. Applications include Fire Service, where detection of leakage or unauthorized water usage is required. Not utilized as an approved backflow preventer.

AWWA Class 1 and 2 utilization

Additional Resources

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