1 1/4 LF909-QT-FS

Item Number: F391010
1 1
$4,825.43
Limited Stock (3)
Estimated transit time: 2 to 5 Business Days Eligible for Express Shipping

Brand - Watts
  • Lead Free* construction
  • Patented air-in/water-out relief valve design
  • Compact, modular design for easy installation
  • Replaceable seats for simplified maintenance
  • Flood sensor with SentryPlus Alert® technology
  • Maximum Working Pressure: 175 PSI
  • Continuous Operating Temperature: 33°F - 140°F
  • Horizontal or vertical installation capability

Description

The Watts 1 1/4" LF909M1 Lead Free Reduced Pressure Zone backflow preventer assembly safeguards potable water from pollution due to backsiphonage or backpressure. Featuring Lead Free* construction and a patented air-in/water-out design, it ensures maximum relief valve discharge. This compact unit includes quarter-turn shutoff valves, replaceable seats, and an integrated flood sensor with SentryPlus Alert® technology for discharge detection. It operates up to 175 PSI and 140°F continuously, suitable for various health hazard cross-connection applications and can be installed horizontally or vertically. Item number F391010.
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Additional Details

This Watts 1 1/4 inch LF909M1 Lead Free Reduced Pressure Zone (RPZ) backflow preventer assembly provides superior protection for potable water supplies against pollution from backsiphonage or backpressure. It is ideal for continuous pressure piping applications and cross-connections identified as health hazards or other contaminant sources.

The assembly's exclusive design incorporates the patented "air-in/water-out" principle, ensuring maximum relief valve discharge during emergency conditions with both checks fouled.

Key Features

  • Lead Free* construction complies with installation requirements
  • Modular, compact design eases installation
  • Replaceable seats for simplified maintenance
  • Can be installed horizontally or vertically (up or down) on limited sizes
  • No special tools required for servicing
  • Equipped with full port, resilient-seated, Lead Free* cast copper silicon alloy ball valve shutoffs with lever handles
  • Top mounted test cocks for easy testing

Flood Detection System

  • Includes a flood sensor with SentryPlus Alert® technology on the relief valve to detect continuous water discharges
  • Flood alerts are activated with an add-on sensor connection kit (sold separately), compatible with BMS and cellular communication

NOTICE: The use of the flood sensor does not replace the need to comply with all required instructions, codes, and regulations for installation, operation, and maintenance, including proper drainage. Watts is not responsible for alert failures due to connectivity or power issues.

Specifications

General

  • Brand: Watts
  • Series: LF909M1
  • Size: 1 1/4 inch
  • Design: Reduced Pressure Zone (RPZ) Assembly
  • Installation: Horizontal or vertical (up or down)

Materials

  • Body Material: Lead Free* cast copper silicon alloy
  • Shutoff Valve Material: Lead Free* cast copper silicon alloy
  • Check Valve Seats: Celcon®
  • Relief Valve Seats: Stainless Steel 909
  • Test Cocks: Lead Free* cast copper silicon alloy

Performance

  • Maximum Operating Pressure: 175 PSI (12.1 bar)
  • Continuous Operating Temperature: 33°F - 140°F (0.5°C - 60°C)
  • Intermittent Operating Temperature: 194°F (90°C)

Certificates & Approvals

  • ASSE 1013
  • CSA B64.4
  • IAPMO Listed
  • USC FCCCHR (USC Foundation for Cross-Connection Control and Hydraulic Research) Approved
  • Tested and Certified by NSF International

FAQs

What is the primary function of the Watts LF909M1 backflow preventer?

The primary function is to protect potable water supplies from contamination caused by backsiphonage or backpressure. It prevents polluted water from flowing back into the clean water system, making it ideal for health hazard cross-connections.

What does "Lead Free*" construction mean for this assembly?

The "Lead Free*" designation means that the wetted surface of this product, which comes into contact with consumable water, contains less than 0.25% lead by weight. This ensures compliance with modern installation requirements.

How does the patented "air-in/water-out" principle work?

This unique design allows air to be admitted into the reduced pressure zone while water drains to atmosphere. This ensures maximum relief valve discharge even when both check valves are fouled, effectively preventing backflow.

What is the purpose of the integrated flood sensor?

The flood sensor with SentryPlus Alert® technology detects continuous water discharges from the relief valve. When paired with an add-on connection kit, it can relay alerts to facility personnel or building management systems to help prevent costly water damage.

Can the Watts LF909M1 be installed in different orientations?

Yes, this assembly features a modular, compact design that allows for installation both horizontally and vertically (up or down). This flexibility helps accommodate various plumbing configurations.

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