1 1/4 LF919-QT-S-FS

Item Number: F065380
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$2,737.50
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 1 1/4 inch
  • Lead-Free Bronze Body Construction
  • NPT End Connections
  • Integrated SentryPlus Alert® Flood Sensor
  • Quarter-Turn Ball Valve Shutoffs with Tee Handles
  • Bronze Strainer Included
  • Two Poppet Style Check Valves with Replaceable Seats
  • Compatible with RS-485 Modbus or Wi-Fi (with connection kit)

Description

This 1 1/4 inch Watts LF919-QT-S-FS is a lead-free reduced pressure zone backflow preventer assembly, crucial for protecting potable water from contamination. It features a durable bronze body with NPT end connections and includes a bronze strainer and quarter-turn ball valves. A key feature is the integrated SentryPlus Alert® flood sensor, which detects continuous relief valve discharges. When paired with an optional connection kit, this sensor relays critical alerts to a Building Automation System (BAS) via RS-485 Modbus or to the Nexa® platform over Wi-Fi, ensuring timely maintenance notifications. Item number F065380.

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Connections

  • This 1 1/4 inch backflow preventer assembly features standard NPT end connections for straightforward installation into your piping system.
  • The integrated SentryPlus Alert® flood sensor is designed to connect with an add-on sensor connection kit (sold separately).

System Integration

  • Connection kit options include those for Building Management Systems (BMS) or cellular communication.
  • For advanced monitoring, the sensor can integrate with a Sensor Control Monitor (available separately) to deliver maintenance alerts to your Building Automation System (BAS) via RS-485 Modbus or directly to the Nexa® platform through Wi-Fi connectivity.
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Additional Details

The 1 1/4 inch Watts LF919-QT-S-FS is a lead-free reduced pressure zone backflow preventer assembly designed to protect potable water supplies from pollution due to backsiphonage or backpressure.

This assembly is ideal for continuous pressure piping applications and cross-connections where health hazards or contaminants are present at the service line entrance.

SentryPlus Alert® Technology

  • Features an integrated flood sensor with SentryPlus Alert® technology to detect continuous water discharges from the relief valve.
  • When paired with an add-on connection kit, the sensor activates to relay alerts for potential flooding events.
  • Connects with a Sensor Control Monitor for integration with Building Automation Systems (BAS) via RS-485 Modbus or the Nexa® platform through Wi-Fi connectivity, providing maintenance alerts.
  • Connection kit options also include BMS and cellular communication (kits sold separately).

Design and Construction

  • Constructed with a lead-free bronze body for durability and compliance.
  • Features NPT end connections for easy installation.
  • Includes a bronze strainer to protect the assembly from debris.
  • Equipped with quarter-turn ball valve shutoffs with tee handles for positive control.
  • Incorporates two poppet-style check valves with replaceable check seats.
  • Designed with a compact, space-saving body with separate access covers for check and relief valves.
  • Top-mounted, screwdriver-slotted test cocks facilitate easy testing in reduced clearance installations.
  • The EZ twist relief valve cover with a quarter-turn locking joint captures spring load during repair to simplify disassembly.
  • Bottom-mounted relief valve further contributes to space efficiency.

Specifications

  • Nominal Pipe Size: 1 1/4 inch
  • Product Type: Reduced Pressure Zone Backflow Preventer Assembly
  • Body Material: Lead-Free Bronze
  • End Connections: NPT
  • Strainer: Bronze
  • Shutoff Valves: Quarter-Turn Ball Valves with Tee Handles
  • Check Valves: Two Poppet Style
  • Check Seats: Replaceable
  • Relief Valve Cover: EZ Twist with Quarter-Turn Locking Joint
  • Relief Valve Mounting: Bottom-mounted
  • Test Cocks: Top-mounted, Screwdriver-slotted
  • Sensor Technology: SentryPlus Alert® Flood Sensor

Connectivity (with Optional Kit)

  • BAS Integration: RS-485 Modbus
  • Cloud Platform Integration: Nexa® (via Wi-Fi)
  • Other Kit Options: BMS, Cellular Communication

FAQs

What does the SentryPlus Alert® flood sensor do?

The SentryPlus Alert® flood sensor detects continuous water discharges from the relief valve, providing early warning of potential flooding events or operational issues.

Is a connection kit included with this backflow preventer?

No, the connection kit for the SentryPlus Alert® flood sensor is not included and must be purchased separately. These kits enable alerts to be relayed to external systems.

What connectivity options are available for the flood sensor?

With an optional connection kit and a Sensor Control Monitor, the flood sensor can integrate with Building Automation Systems (BAS) via RS-485 Modbus or transmit data to the Nexa® platform using Wi-Fi connectivity. BMS and cellular communication options are also available through different kits.

What type of end connections does this assembly have?

This backflow preventer assembly features NPT (National Pipe Taper) end connections for standard threaded pipe installation.

What materials is this backflow preventer made from?

The main body of this backflow preventer is constructed from lead-free bronze, ensuring durability and compliance with potable water standards. It also includes a bronze strainer.

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