The Watts Series LF909 8 inch reduced pressure zone backflow preventer assembly is engineered to prevent the reverse flow of polluted water into the potable water supply due to backsiphonage or backpressure. It is ideal for continuous pressure piping applications, particularly at cross-connections identified as health hazards and other contaminants at the service line entrance.

This assembly features a robust cast iron body with advanced ArmorTek® coating and includes a flood sensor with SentryPlus Alert® technology for enhanced monitoring.

Construction & Design

• Lead Free* construction meets installation requirements.
• Body components are protected by ArmorTek®, a patented three-part advanced epoxy system that reduces microbial-induced corrosion (MIC) and protects exposed metal substrates.
• Includes outside stem and yoke (OSY) resilient seated gate valves for reliable shutoff.
• Features captured spring check valves and replaceable seats for easy maintenance.
• Equipped with top-mounted test cocks for verification.
• A field reversible pressure differential relief valve with a unique "air-in/water-out" design provides maximum discharge capacity during emergency conditions.

Flood Sensor Technology

• Integrated flood sensor with SentryPlus Alert® technology detects excessive water discharges from the relief valve.
• Sensor is installed on the assembly exterior and does not alter its primary functions or certifications.
• When paired with an add-on connection kit (sold separately), the sensor activates to relay alerts to facility personnel, helping to limit potential flooding and associated damage.
• Compatible with BMS, cellular communication, and the Sensor Control Monitor for integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.

NOTICE: An add-on connection kit is required to activate the flood sensor's communication features. Without the connection kit, the sensor is a passive component with no external communication.