Back-Flow Preventer New Installations

Why Is Backflow Protection Needed?

Backflow can occur when pressure conditions cause water to move in the opposite direction from normal flow. If that water comes from irrigation, fire systems, industrial equipment, or another non-potable source, contamination could enter the drinking-water system. Backflow preventers create a mechanical barrier between the potable supply and the potential source.

RP Backflow Preventer Installation

Reduced Pressure Principle assemblies are often used where a higher level of protection is required. They include two check valves and a relief zone.

Because the relief valve can discharge water, installation should account for:

• Drainage
• Clearance
• Accessibility
• Orientation
• Potential relief flow

The discharge opening must remain unobstructed.

Double Check Assembly Installation

Double Check assemblies contain two independently operating check valves. Their permitted applications depend on the water system and local requirements. They should be installed so testing and future maintenance can be performed without unnecessary difficulty.

DCDA Installation

Double Check Detector Assemblies are commonly associated with fire protection systems. They may include a bypass arrangement used to detect low-flow water use. Installation may require coordination with fire protection professionals and applicable authorities.

Vacuum Breaker Installation

Vacuum breakers protect against backsiphonage in specific applications. Correct elevation and placement can be critical to how these devices function.

Choosing the Correct Device

The appropriate backflow preventer is determined by the plumbing hazard and application, not simply by price, available space, or pipe diameter. Incorrect device selection can provide the wrong type of protection.

Potential applications include:

• Irrigation systems
• Fire sprinkler systems
• Commercial water services
• Boilers
• Industrial processes
• Specialty equipment
• Accessibility Matters

Backflow preventers require future testing and repair.

The assembly should be positioned so test cocks, check covers, relief valves, and shutoff valves can be reached. Crowding a device into a difficult location can make annual certification and future rebuilding unnecessarily complicated.

Testing a New Installation

Many new installations require testing after the device is placed into service. Documentation may also need to be submitted to the local water authority.

Building Protection Into the Water System

A backflow preventer is a safety component, not simply another valve. Correct selection, sizing, installation, drainage, access, and testing all contribute to its ability to protect potable water.

A properly installed assembly should perform its protective function while remaining accessible for the periodic testing and maintenance it will require throughout its service life.