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Domestic

BACKFLOW

BackFlow Prevention Assembly

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.

Water pressure can be affected when:

  • there is a break in the water main.
  • water is being pumped from the main water supply during a fire.
  • a customer is using water at a higher pressure than the pressure supplied.
  • heavy water use downstream reduces water pressure upstream.
  • the water outlet at the property is higher than the water main, causing constant back pressure.

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.

  • chemical plants
  • pest controllers
  • golf courses & sports venues
  • RV parks
  • greywater treatment systems
  • metal processing plants
  • manufacturing plants
  • laundries
  • nurseries & commercial garden centers
  • properties with rainwater storage

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.

System Components

The Park BlackFlo Preventer System is the perfect solution for ensuring safe water. Designed to prevent cross-connection, Park backflow prevention systems are economical, easy to specify, and factory-built, offering long-lasting and dependable service.

Vault or Pad System
All backflow assembly vaults and pads 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 need for any other structural protection. The unit is of monolithic construction at bottom and walls to insure against joint leakage. Each vault is equipped with an access hatchway safety net for fall protection.

Pipe Valves & Fittings
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.

Applications
To select the right backflow prevention system, contact Park and also the local building code authorities for exact specific requirements. For more information on backflow prevention for fire protection system, click here PDF LINK

Double Check Assemblies

Double Check Assemblies are used to prevent the cross-connection and backflow pollutants that are objectionable but non-toxic. Double Checks may be installed under continuous pressure service and may be subject to back pressure. Double checks can be used in sprinkler irrigation systems, fire protection systems without chemical additives, protection of industrial plants, and other systems requiring protection. Applications include Domestic and Fire water service AWWA Classes 1 thru 4 utilization

How it Works
The Double Check Assembly is composed of two single, independently acting check valves. The unit also has two tightly closing, resilient seated, shutoff valves located at each end of the device and four test cocks for the testing of the check valves. In a non-flow condition, the check valves hold a 1 PSI minimum in the direction of flow. In a low condition, the check valves are open proportional to the flow demand. In a back flow condition, the check valves will close until the resumption of normal flow.

Inspection and Maintenance Requirement
Double Check backflow preventers must be inspected annually with the results recorded on an official Water Backflow Preventer Inspection Report to be submitted to the local AHJ. If the Double Check fails inspection, it must be repaired or replaced then pass a subsequent inspection.
Applications for Combination Water Meters include; hotels, hospitals, schools, and other large water customers requiring water service through a single line.

Available Models:

Model BP
The ParkUSA Model BP Backflow Preventer contain a Double Check Backflow Preventer with NRS (Non-Rising Stem) or OS&Y (outside screw & yoke) gate valves in a precast vault with steel cover and hatchway. Applications include Domestic and Fire water service.

Additional Resources

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