1 1/2 LF909M1-QT-FS

Item Number: F391011
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$5,195.92
Limited Stock (3)
Estimated transit time: 2 to 5 Business Days Eligible for Express Shipping

Brand - Watts
  • Lead Free cast copper silicon alloy body
  • Size: 1 1/2 inch
  • Connection Type: Male NPT Threaded
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F - 140°F (continuous)
  • Integrated flood sensor with SentryPlus Alert® technology
  • Horizontal or vertical installation
  • Quarter-turn ball valve shutoffs with lever handles

Description

The Watts 1 1/2 inch LF909M1-QT-FS Lead Free Reduced Pressure Zone Backflow Preventer Assembly provides superior cross-connection control for potable water supplies. It features a patented air-in and water-out relief valve design for emergency discharge and includes an integrated flood sensor with SentryPlus Alert® technology to detect excessive water release. Constructed with lead free cast copper silicon alloy, it ensures compliance with lead-free installation requirements. This assembly offers a maximum working pressure of 175 psi and supports horizontal or vertical installation, making it suitable for various health hazard cross-connection applications. Item number F391011.

Help Me Connect

How It Connects

  • The 1 1/2 inch LF909M1-QT-FS backflow preventer assembly connects via 1 1/2 inch Male NPT threads on both the inlet and outlet.
  • It is designed for installation in continuous pressure piping applications and at cross-connections to protect the potable water supply.
  • The flood sensor's alert features require an add-on connection kit (sold separately) to communicate with external systems like BMS or cellular networks for real-time notifications.
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Additional Details

This 1 1/2 inch Lead Free reduced pressure zone backflow preventer assembly protects potable water supplies from hazardous materials caused by backsiphonage or backpressure. It is ideal for continuous pressure piping applications and cross-connections identified as health hazards.

Its exclusive design features a patented air-in and water-out principle, providing high-capacity relief valve discharge during emergency conditions when both check valves are fouled. The integrated flood sensor with SentryPlus Alert® technology detects excessive water discharges from the relief valve, helping prevent costly damage. An add-on connection kit (sold separately) is required to activate the sensor's alert features, which can integrate with BMS, cellular communication, or the Nexa® platform via Wi-Fi.

Construction & Design

  • Features a modular, compact design for easy installation
  • Can be installed horizontally or vertically (up or down)
  • Equipped with replaceable seats and top-mounted test cocks
  • Requires no special tools for servicing
  • Includes quarter-turn ball valve shutoffs with lever handles
  • Constructed with a Lead Free cast copper silicon alloy body and Lead Free test cocks
  • Check seats are 909 Celcon® and relief valve seats are Stainless Steel 909

Installation of a drain line is recommended, and an air gap is necessary when installing a drain line. Without an add-on connection kit, the flood sensor is a passive component and will not communicate with other devices.

Specifications

  • Body Material: Lead Free cast copper silicon alloy
  • Check Seat Material: 909 Celcon®
  • Relief Valve Seat Material: Stainless Steel 909
  • Test Cock Material: Lead Free cast copper silicon alloy
  • Nominal Size: 1 1/2 inch
  • Connection Type: Male NPT Threaded
  • Temperature Range (Continuous): 33°F - 140°F (0.5°C - 60°C)
  • Temperature Range (Intermittent): 180°F (82°C)
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Shutoff Valves: Quarter-turn ball valves with lever handles
  • Flood Detection: Integrated flood sensor with SentryPlus Alert® technology
  • Installation Orientation: Horizontal or vertical (up or down)

Certificates & Approvals

  • ASSE 1013
  • AWWA C-511-92
  • CSA B64.4
  • FCCCHR of USC Manual Section 10
  • IAPMO (UPC) Listed
  • SBCCI (Standard Plumbing code) Listed
  • Tested and Certified by NSF International
  • Certified to NSF/ANSI 61-G & 372

FAQs

What is the primary purpose of this backflow preventer assembly?

This backflow preventer assembly is designed to provide superior cross-connection control, protecting the potable water supply from contamination due to backsiphonage or backpressure of hazardous materials.

What type of connections does the 1 1/2 inch LF909M1-QT-FS have?

The 1 1/2 inch LF909M1-QT-FS model features 1 1/2 inch Male NPT threaded connections for both the inlet and outlet.

How does the flood sensor function, and what is required to activate it?

The integrated flood sensor with SentryPlus Alert® technology detects excessive water discharges from the relief valve. To activate its alert features and enable communication, an add-on connection kit (BMS, cellular, or Sensor Control Monitor options available) must be purchased separately.

What are the temperature and pressure ratings for this assembly?

This assembly has a continuous temperature range of 33°F to 140°F (0.5°C to 60°C) and an intermittent range up to 180°F (82°C). The maximum working pressure is 175 psi (12.1 bar).

Can this backflow preventer be installed in different orientations?

Yes, this Watts LF909M1 backflow preventer assembly can be installed either horizontally or vertically (up or down) on limited sizes, offering flexibility for various installation requirements.

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