8 LF957RPDA-OSY-CFM-FS

Item Number: F122723
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$24,092.34
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • 8 inch Lead Free Reduced Pressure Detector Backflow Preventer
  • Weight: 647.0 lb
  • Housing & Sleeve Material: 304 Stainless Steel
  • Maximum Working Pressure: 175 PSI
  • Temperature Range: 33°F - 110°F
  • Features SentryPlus Alert® Flood Sensor
  • UL Classified and FM Approved OSY Shutoff Valves
  • Approved for Horizontal Installation
  • Includes Cubic Feet Meter (CFM) for leak detection

Description

The 8 inch Watts LF957RPDA-OSY-CFM-FS is a Lead Free Reduced Pressure Detector Backflow Preventer Assembly designed to prevent reverse flow of non-potable liquids due to backpressure or backsiphonage, critical for health hazard applications. Constructed with a 304 stainless steel body and UL/FM approved OSY shutoff valves, it offers superior corrosion resistance and durability. Key features include a SentryPlus Alert® flood sensor for detecting relief valve discharge and a cubic feet meter (CFM) for leak detection. This compact, horizontally installed assembly operates up to 175 PSI and complies with state lead-free standards. Item number F122723.

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Connections

  • This 8 inch backflow preventer assembly features UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves with 150 pound ANSI/AWWA CL D flanged connections for main shutoffs.
  • The internal assembly's stainless steel sleeve is designed with groove end connections.
  • The flood sensor is designed to connect to an add-on connection kit (sold separately) for integration with a Sensor Control Monitor, enabling connectivity to Building Automation Systems (BAS) via RS-485 Modbus or the Nexa® platform via Wi-Fi and cellular communication for remote alerts.
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Additional Details

The 8 inch Watts LF957RPDA-OSY-CFM-FS Lead Free Reduced Pressure Detector Backflow Preventer Assembly helps prevent the reverse flow of non-potable liquids due to backpressure or backsiphonage, especially where potential health hazards exist. This extremely compact assembly features a stainless steel body and UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves.

A unique feature is the integrated SentryPlus Alert® flood sensor, which detects continuous discharge from the relief valve, indicating a potential flooding event. This assembly is designed for horizontal pattern installation and is lighter than traditional designs, making it suitable for smaller enclosures.

Construction & Design

  • Features two independent torsion spring check modules and a differential pressure relief valve, all contained within a single accessible sleeve.
  • Includes a cubic feet meter (CFM) to detect underground leaks and unauthorized water use.
  • Bottom mounted pressure relief valve reduces clearance requirements.
  • Complies with state codes and standards for reduced lead content.

Flood Detection System

  • Equipped with a SentryPlus Alert® flood sensor to monitor relief valve discharge.
  • Add-on sensor connection kits (sold separately) enable integration with a Sensor Control Monitor, allowing for maintenance alerts to be sent to Building Automation Systems (BAS) via RS-485 Modbus or the Nexa® platform via Wi-Fi connectivity and cellular communication.

Specifications

  • Assembly Type: Lead Free Reduced Pressure Detector Backflow Preventer
  • Product Size: 8 inch
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Shutoff Valve Type: UL Classified and FM Approved Outside Stem and Yoke (OSY) Resilient Seated Gate Valves
  • Check Discs: Reversible Silicone or EPDM
  • Elastomers: EPDM, Silicone, Buna 'N'
  • Torsion Spring Checks Material: Noryl®, Stainless Steel
  • Test Cocks Material: Lead Free* Bronze Body
  • Pins & Fasteners Material: 300 Series Stainless Steel
  • Springs Material: Stainless Steel
  • Flood Sensor Technology: SentryPlus Alert®
  • Meter Type: Cubic Feet Meter (CFM)

Performance

  • Maximum Working Pressure: 175 PSI (12.1 bar)
  • Temperature Range: 33°F - 110°F (0.5°C - 43°C)

Certificates & Approvals

  • Approved by Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California (FCCCHR-USC)
  • AWWA C511-97
  • ASSE 1047
  • CSA B64.4
  • UL Classified
  • FM Approved
  • NSF Certified to NSF/ANSI 372

FAQs

What is the primary purpose of the Watts LF957RPDA-OSY-CFM-FS backflow preventer?

This 8 inch Lead Free Reduced Pressure Detector Backflow Preventer Assembly is designed to stop the reverse flow of liquids, such as those caused by backpressure or backsiphonage, especially in applications where potential health hazards exist.

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

The housing and sleeve are made from 304 (Schedule 40) stainless steel. Key components like elastomers are EPDM, silicone, and Buna 'N', while torsion spring checks use Noryl® and stainless steel. Test cocks are lead-free bronze.

How does the SentryPlus Alert® flood sensor function?

The integrated SentryPlus Alert® flood sensor detects continuous discharge or excessive water from the relief valve. When paired with an add-on connection kit, it can relay alerts via a Sensor Control Monitor to a Building Automation System (BAS) or the Nexa® platform.

What are the main connection types for this 8 inch backflow assembly?

The assembly features UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves with 150 pound ANSI/AWWA CL D flanged connections. The internal stainless steel sleeve utilizes groove end connections.

What are the maximum operating pressure and temperature limits for this unit?

This backflow preventer has a maximum working pressure of 175 PSI (12.1 bar) and an operating temperature range of 33°F to 110°F (0.5°C to 43°C).

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