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Backflow Preventer New Installations

New backflow preventer installation protects potable water systems from contamination or pollution caused by reverse water flow. The correct device depends on the type of connection, potential hazard, water-system design, and requirements of the local authority.

Proper installation involves more than selecting a backflow assembly by pipe diameter. Device type, orientation, accessibility, drainage, testing clearance, and pressure requirements must all be considered.

Types of Backflow Prevention Assemblies

Common devices include:

  • Reduced Pressure Principle assemblies (RP)
  • Double Check assemblies (DC)
  • Double Check Detector Assemblies (DCDA)
  • Vacuum breakers

Each provides a different level and method of protection.

Reduced Pressure Backflow Preventer Installation

RP assemblies are often used where a higher degree of hazard protection is required.

Because the relief valve can discharge water, installation must account for drainage and the potential consequences of relief flow.

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Double Check Assembly Installation

Double-check assemblies use two independently operating check valves.

Their suitability depends on the application and local requirements.

DCDA Backflow Installation

Double Check Detector Assemblies are commonly associated with fire protection systems.

Installation should account for fire-system design, meter arrangements, testing access, and coordination with other professionals where required.

Vacuum Breaker Installation

Vacuum breakers help protect against backsiphonage in specific plumbing applications.

Their effectiveness depends on correct placement and installation conditions.

The correct backflow preventer is determined by the hazard and plumbing application, not simply by which device costs less or fits the available space.

Common Backflow Applications

New installations may protect:

  • Irrigation systems
  • Commercial water services
  • Fire sprinkler systems
  • Industrial equipment
  • Boilers
  • Specialty plumbing equipment

Installation Accessibility

Backflow preventers require periodic testing and eventual maintenance.

They should therefore be installed where test ports, covers, checks, and shutoff valves can be reached safely.

Testing a New Backflow Preventer

Many new installations require testing and certification before or shortly after being placed into service.

Documentation procedures vary by local water authority.

Residential and Commercial Installations

Smaller residential systems may use backflow protection for irrigation or specialty equipment, while commercial sites may contain several assemblies serving separate water systems.

Properly installed backflow prevention protects both the property and the larger potable-water system from undesirable reverse flow.

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