1 1/2 LF919-QT-FS

Item Number: F065375
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$2,484.55
Limited Stock (8)
Estimated transit time: 2 to 5 Business Days Eligible for Express Shipping

Brand - Watts
  • Size: 1 1/2 inch
  • Body Material: Lead-Free Bronze
  • End Connections: NPT
  • Shutoff Valves: Quarter Turn Ball Valves
  • Flood Sensor: SentryPlus Alert® Technology
  • Monitoring: BAS (RS-485 Modbus) and Nexa® (Wi-Fi) Compatible
  • Check Valves: Two Poppet Style
  • Design: Compact, Space-Saving

Description

This 1 1/2 inch Watts LF919-QT-FS lead-free reduced pressure zone backflow preventer assembly prevents polluted water from contaminating potable supplies. It features a durable lead-free bronze body and NPT end connections, ideal for continuous pressure applications. An integrated SentryPlus Alert® flood sensor detects relief valve discharges, providing early warning for potential issues. When paired with an optional connection kit, the sensor relays alerts to Building Automation Systems via RS-485 Modbus or the Nexa® platform through Wi-Fi. It includes quarter turn ball valves, two poppet style check valves, and top-mounted test cocks for easy maintenance.

Help Me Connect

This 1 1/2 inch backflow preventer features NPT end connections for standard plumbing installations. Its integrated SentryPlus Alert® flood sensor detects relief valve discharges. To enable remote alerts for potential flooding, this assembly requires an add-on connection kit (sold separately).

Connection Kit Options:

  • BMS (Building Management System)
  • Cellular Communication
  • Sensor Control Monitor: Integrates with your existing Building Automation System (BAS) via RS-485 Modbus or sends alerts to the cloud-based Nexa® platform via Wi-Fi.

The Sensor Control Monitor and its connection kits are installed separately and facilitate the communication of maintenance alerts based on flood sensor detection.

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Additional Details

This 1 1/2 inch lead-free reduced pressure zone backflow preventer assembly is designed to prevent the flow of polluted water from entering the potable water supply due to backsiphonage and/or backpressure. It is ideal for protection in continuous pressure piping applications and at cross-connections identified as health hazards.

Key Features

  • Lead-free bronze body construction with NPT end connections
  • Quarter turn ball valve shutoffs with lever handles
  • Two poppet style check valves and replaceable check seats
  • Compact, space-saving design with separate access covers for check valves and relief valve
  • Top-mounted, screwdriver-slotted test cocks for easy testing and use in reduced clearance installations
  • EZ twist relief valve cover with quarter turn locking joint to capture the spring load during repair
  • Bottom-mounted relief valve for reduced space requirements

Integrated Flood Monitoring

  • Features a flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve
  • When paired with an add-on connection kit (sold separately), the sensor activates to relay alerts for potential flooding events
  • Connection kit options, including the Sensor Control Monitor, enable integration with Building Automation Systems (BAS) via RS-485 Modbus or the Nexa® platform through Wi-Fi to deliver maintenance alerts

Installation of the Sensor Control Monitor and connection kits requires a certified technician to make electrical connections, following all local, state, federal, and governmental requirements, and building and construction codes and standards.

Specifications

  • Size: 1 1/2 inch
  • Body Material: Lead-Free Bronze
  • End Connections: NPT
  • Shutoff Valves: Quarter Turn Ball Valves with Lever Handles
  • Check Valves: Two Poppet Style
  • Relief Valve: Bottom-Mounted with EZ Twist Cover
  • Test Cocks: Top-Mounted, Screwdriver-Slotted
  • Monitoring Technology: SentryPlus Alert® Flood Sensor
  • System Integration: Compatible with Sensor Control Monitor for BAS (RS-485 Modbus) or Nexa® (Wi-Fi) alerts (connection kit sold separately)

FAQs

What is the primary function of this backflow preventer?

This 1 1/2 inch lead-free reduced pressure zone backflow preventer assembly prevents polluted water from entering the potable water supply due to backsiphonage or backpressure. It is suitable for continuous pressure piping applications and cross-connections identified as health hazards.

What is SentryPlus Alert® technology?

SentryPlus Alert® technology refers to the integrated flood sensor within the backflow preventer. It is designed to detect continuous water discharge from the relief valve, signaling potential flooding events.

Is a separate connection kit required for monitoring?

Yes, an add-on connection kit (sold separately) is required to activate the flood sensor and relay alerts for potential flooding events. This kit facilitates integration with monitoring systems.

How does this backflow preventer integrate with monitoring systems?

When paired with a connection kit, the flood sensor can send alerts to a Building Automation System (BAS) via RS-485 Modbus or to the Nexa® platform through Wi-Fi. This provides remote maintenance alerts.

What are the key construction materials and valve types?

The assembly features a durable lead-free bronze body construction with NPT end connections. It includes quarter turn ball valve shutoffs with lever handles and two poppet style check valves with replaceable check seats.

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