1 1/4 LF825Y-QT-RP-FS

Item Number: F683008
1 1
$2,132.43
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Febco
  • 1 1/4 inch Lead Free Reduced Pressure Zone Backflow Preventer
  • Flood Sensor with SentryPlus Alert Technology for Discharge Detection
  • Lead Free* Cast Copper Silicon Alloy Body
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 32°F to 140°F
  • Quarter Turn Ball Shutoff Valves
  • Modular Relief Valve and Check Valves for Easy Maintenance
  • NPT ANSI/ASME B1.20.1 Threaded Connections

Description

The FEBCO LF825Y Series 1 1/4 inch Lead Free Reduced Pressure Zone Backflow Preventer assembly protects potable water supplies from high hazard fluids. Designed for industrial, hospital, chemical, and irrigation applications, it features lead free* cast copper silicon alloy construction and NPT threaded connections. This unit includes quarter turn shutoff valves and a flood sensor with SentryPlus Alert technology to detect relief valve discharge. It operates up to 175 psi and between 32°F to 140°F. Modular internal components ensure easy in-line maintenance, while certifications like ASSE 1013 and AWWA C511 confirm its reliability. Item number F683008.

Help Me Connect

Sensor Connectivity

  • The integrated flood sensor is designed to detect excessive water discharges from the relief valve.
  • To activate flood alerts, an add-on connection kit is required. Without this kit, the sensor operates as a passive component and does not communicate with other devices.
  • Connection kit options include compatibility with BMS (Building Management Systems), cellular communication, or the Sensor Control Monitor.
  • The Sensor Control Monitor enables integration with BAS via RS-485 Modbus or the Nexa platform through Wi-Fi.

Main Connections

  • This assembly features 1 1/4 inch NPT ANSI/ASME B1.20.1 threaded end connections for secure installation into your piping system.
  • It includes quarter turn ball valves for convenient shutoff.
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Additional Details

The FEBCO Series LF825Y 1 1/4 inch Reduced Pressure Zone Backflow Preventer Assembly provides reliable protection against high hazard (toxic) fluids in potable water supplies.

This assembly is ideal for industrial plants, hospitals, chemical facilities, irrigation systems, boiler feed lines, and other installations requiring maximum cross-connection contamination protection.

Key Features

  • Features a flood sensor with SentryPlus Alert technology to detect continuous discharge from the relief valve.
  • Includes threaded quarter turn ball valves and test cocks for shutoff.
  • Lead Free* construction complies with state codes and standards.
  • Modular relief valve and check valves for easy maintenance.
  • All internal parts are serviceable in line.
  • Designed with low head loss.
  • Spring loaded "Y" type check valves.
  • Replaceable seat rings on all sizes.

Operation

  • In normal flow conditions, the check valves are open with the zone pressure maintained at least 5 psi lower than the inlet pressure, and the relief valve is closed.
  • Should abnormal conditions arise (no flow or reversal of flow), the differential relief valve opens and discharges to maintain the zone at least 2 psi lower than the supply.
  • When normal flow resumes, the differential pressure in the zone resumes and the relief valve closes.

Construction

  • Mainline valve body and caps are Lead Free* cast copper silicon alloy.
  • Relief valve body and cover are Lead Free* cast copper silicon alloy.
  • Check valve moving member is center stem guided.
  • Elastomers feature Nitrile seat discs.
  • Diaphragms are Nitrile, fabric reinforced.
  • Springs are Stainless steel.
  • End connections are NPT ANSI/ASME B1.20.1.

Note: An add-on connection kit is required to activate the flood sensor's alert features. Without this kit, the sensor is a passive component without communication to other devices. Watts® is not responsible for the failure of alerts due to connectivity or power issues.

Specifications

General

  • Product Type: Reduced Pressure Zone Backflow Preventer
  • Series: LF825Y
  • Model: LF825Y-QT-RP-FS
  • Nominal Size: 1 1/4 inch
  • Connection Type: NPT ANSI/ASME B1.20.1 Threaded
  • Shutoff Valves: Quarter Turn Ball Valves
  • Flood Sensor: Yes, with SentryPlus Alert technology

Performance

  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Hydrostatic Test Pressure: 350 psi (24.1 bar)
  • Temperature Range: 32°F to 140°F (0°C to 60°C)
  • Minimum Differential in Zone (Normal Flow): 5 psi
  • Minimum Differential in Zone (Abnormal Flow): 2 psi

Materials

  • Main Valve Body: Lead Free* Cast Copper Silicon Alloy
  • Relief Valve Body: Lead Free* Cast Copper Silicon Alloy
  • Elastomers: Nitrile Seat Discs
  • Diaphragms: Nitrile, Fabric Reinforced
  • Springs: Stainless Steel

Dimensions & Weight (Approximate)

  • Length (A): 17 in (432 mm)
  • Width (B* less shutoffs): 10 1/2 in (267 mm)
  • Height (C): 4 1/2 in (114 mm)
  • Depth (D): 4 1/2 in (114 mm)
  • E: 5 in (127 mm)
  • Weight: 26.5 lb (12.0 kg)

Certificates & Approvals

  • Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California
  • AWWA C511 Conformance
  • ASSE 1013
  • CSA B64.4
  • NSF Certified to NSF/ANSI 61-G
  • UPC

FAQs

What types of fluids does the LF825Y-QT-RP-FS protect against?

This assembly is designed to protect potable water supplies from high hazard (toxic) fluids. It prevents reverse flow due to backsiphonage and/or backpressure.

How does the flood sensor function on this backflow preventer?

The integrated flood sensor with SentryPlus Alert technology detects excessive water discharges from the relief valve. An add-on connection kit is required to activate flood alerts and enable communication with systems like BMS or the Nexa platform.

What are the key materials used in the construction of this backflow preventer?

The main valve body, caps, relief valve body, and cover are constructed from Lead Free* cast copper silicon alloy. Elastomers are Nitrile seat discs, diaphragms are Nitrile fabric reinforced, and springs are Stainless steel.

What are the connection types and sizes for this model?

This model features 1 1/4 inch NPT ANSI/ASME B1.20.1 threaded end connections for secure installation. It also includes quarter turn ball valves for shutoff.

Is this backflow preventer compliant with lead-free requirements?

Yes, the FEBCO Series LF825Y features Lead Free* construction. The wetted surface of the product contacted by consumable water contains less than 0.25% of lead by weight, complying with Lead Free installation requirements.

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