3 LF909-DOSY-FS

Item Number: 88009313
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$16,762.76
Limited Stock (2)
Estimated transit time: 2 to 5 Business Days Eligible for Express Shipping

Brand - Watts
  • Size: 3 inch
  • Weight: 282.0 lb
  • Type: Lead Free Reduced Pressure Zone Backflow Preventer
  • Coating: ArmorTek® for corrosion resistance
  • Flood Sensor: SentryPlus Alert® technology
  • Shutoff Valves: Domestic OSY resilient seated gate valves
  • Maximum Operating Pressure: 175 psi
  • Temperature Range: 33°F to 110°F continuous
  • Certifications: ASSE 1013, AWWA C511-92, CSA B64.5, NSF/ANSI 61-G

Description

This Watts Series LF909 3 inch Lead Free Reduced Pressure Zone Backflow Preventer Assembly protects potable water from pollution due to backsiphonage and backpressure. Ideal for health hazard cross-connections and continuous pressure applications, it features an ArmorTek® coated cast iron body for superior corrosion resistance and domestic OSY shutoff valves. A SentryPlus Alert® flood sensor detects excessive discharge, providing alerts when paired with an add-on connection kit. Rated for 175 psi maximum working pressure and 33-110°F continuous temperature, this assembly is ASSE 1013, AWWA C511-92, CSA B64.5, and NSF/ANSI 61-G certified, ensuring reliable performance and compliance.

Help Me Connect

Flood Sensor Connectivity

  • The integrated flood sensor with SentryPlus Alert® technology requires an add-on connection kit to become active and relay alerts for excessive water discharge.
  • Without a connection kit, the sensor functions as a passive component without communication capabilities.
  • Compatible connection kit options include modules for Building Management Systems (BMS), cellular communication, or the Sensor Control Monitor for integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.

Drainage Considerations

  • A drain line installation is recommended for proper discharge in the event of relief valve operation.
  • When installing a drain line, ensure an air gap is provided to prevent potential backflow into the assembly.
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Additional Details

The Watts Series LF909 3 inch Lead Free Reduced Pressure Zone Backflow Preventer Assembly is designed to protect potable water supplies from pollution caused by backsiphonage or backpressure.

It is ideal for continuous pressure piping applications and health hazard cross-connections, including containment at the service line entrance.

Construction & Design

  • Features an epoxy coated cast iron body and domestic outside stem and yoke (OSY) resilient seated gate valves.
  • Incorporates captured spring check valves, replaceable seats, and top mounted test cocks.
  • Includes a field reversible pressure differential relief valve with a unique “air-in/water-out” design for maximum discharge capacity during emergency conditions.
  • ArmorTek® coating technology, a patented 3-part advanced epoxy system, reduces microbial-induced corrosion (MIC) and protects exposed metal substrates.
  • Designed with Lead Free* construction, ensuring the wetted surface contacting consumable water contains less than 0.25% lead by weight.

Flood Detection & Alerts

  • Equipped with a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve.
  • When paired with an add-on connection kit, the sensor activates to relay alerts for potential flooding events.
  • Add-on connection kit options include BMS, cellular communication, and the Sensor Control Monitor for integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.

Specifications

  • Size: 3 inch
  • Body Material: Cast Iron (Check Valve Body), Lead Free* Cast Copper Silicon Alloy (Relief Valve Body)
  • Coating: ArmorTek® Powder Coating (internal and external surfaces)
  • Seat Material: Stainless Steel
  • Trim Material: Stainless Steel
  • Shutoff Valves: Domestic Outside Stem and Yoke (OSY) Resilient Seated Gate Valves
  • Flood Sensor: SentryPlus Alert® Technology
  • Temperature Range: 33°F to 110°F (0.5°C to 43°C) continuous, 140°F (60°C) intermittent
  • Maximum Working Pressure: 175 psi (12.06 bar)

Certificates & Approvals

  • ASSE 1013
  • AWWA C511-92
  • CSA B64.5
  • UL Classified File No. EX3185
  • IAPMO (UPC) Listed
  • NSF Certified to NSF/ANSI 61-G
  • Approved by Foundation for Cross-Connection Control and Hydraulic Research at USC

FAQs

What is the primary purpose of the Watts Series LF909 Reduced Pressure Zone Assembly?

This assembly is designed to prevent the reverse flow of polluted water from entering the potable water supply due to backsiphonage or backpressure, protecting against health hazards in continuous pressure piping applications.

What does "Lead Free" mean for this backflow preventer?

"Lead Free" construction means the wetted surface of this product that comes into contact with consumable water contains less than 0.25% lead by weight, complying with Lead Free installation requirements.

How does the ArmorTek® coating benefit the assembly?

The ArmorTek® coating is a patented three-part advanced epoxy system applied to the cast iron body and internal surfaces. It is engineered to reduce microbial-induced corrosion (MIC) and protect exposed metal substrates, enhancing durability.

How does the SentryPlus Alert® flood sensor function?

The SentryPlus Alert® flood sensor detects excessive water discharges from the relief valve. To activate flood alerts and relay signals to facility personnel, an add-on connection kit is required.

What types of connection kits are available for the flood sensor?

Add-on connection kit options include compatibility with Building Management Systems (BMS), cellular communication, and the Sensor Control Monitor, which integrates with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.

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