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Domestic

Backflow Prevention

The water supply system is designed to ensure that water flows to properties and buildings under pressure. There is a risk to public health if there is a cross-connection between the water supply and a contaminated source. If there is a pressure drop in the water main, a vacuum could be created in the water supply system. Under certain conditions this creates a siphoning effect and draws liquid from a contaminated source back into the drinking water supply.

Many building codes and jurisdictions require a backflow prevention device where these hazards exist. The design professional should consult building / code authorities for specific requirements.

Potential cross-connection hazards are found in potable, fire-protection, irrigation, and industrial water lines. Backflow prevention devices are designed to protect the public water supply from cross-connections. A number of different property types pose a particular risk through cross connections, for example:  

  • chemical plants
  • pest controllers 
  • golf courses & sports venues
  • RV parks
  • greywater treatment systems
  • metal processing plants
  • manufacturing plants
  • laundries

Click on below grey tab to see additional resources.

Additional Resources

The current models for the ParkUSa Back Flow Preventer are detailed in the below Table 1.

Model Description Size
DTC

Single Detector Check Valve with OS&Y gate valves in a precast concrete vault with steel cover & hatchway.

Applications: Fire Service, where detection of leakage or unauthorized water usage is required, (Not utilized as approved backfl ow preventer) AWWA Class 1 & 2 utilization

4” Thru 10”
BP

Double Detector Check Backfl ow Preventer with OS&Y gate valves in a precast concrete vault with steel cover & hatchway.

Applications: Domestic & Fire Water Service. AWWA Class 1, 2, 3, 4 utilization

3/4” Thru 10”
DDBP

Double Detector Check Backfl ow Preventer with detector meter, & OS&Y gate valves in a precast concrete vault with steel cover & hatchway.

Applications: Domestic & Fire Service, where detection of leakage or unauthorized water usage is required, AWWA Class 1,2, 3, 4 utilization

3/4” Thru 10”
DDBPPF

Double Detector Check Backfl ow Preventer with OS&Y gate valve, Post Indicator Valve, & Fire Department Connection in a precast concrete vault with steel cover & hatchway.

Applications: Fire Service, where a fire department connection and position indicator valve is required. Provides high visibility and easy access to local fire authorities. Access in emergencies situations. AWWA Class 1, 2, 3, & 4 utilization

6” Thru 10”
RPZ

Reduced Pressure Backfl ow Preventer with OS&Y gate valves on a precast concrete pad.

Applications: Domestic & Fire Water Service. AWWA Class 4, 5, 6 utilization

3/4” Thru 10”

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