3 957-DNRS-FS

Item Number: F792320
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$14,979.40
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 3 Inch
  • Weight: 227.0 lb
  • Housing Material: 304 Stainless Steel
  • Valve Type: Domestic Non-Rising Stem (NRS)
  • Flood Sensor: SentryPlus Alert® Technology
  • Maximum Working Pressure: 175 PSI
  • Temperature Range: 33°F - 140°F
  • Approved for Horizontal Installation
  • Certifications: ASSE 1013, CSA B64.4, UL, FM, NSF

Description

This 3 inch Watts Series 957-DNRS-FS reduced pressure zone (RPZ) backflow preventer is designed to protect potable water from contamination due to backpressure or backsiphonage. Featuring a durable 304 stainless steel housing and domestic non-rising stem (NRS) shutoff valves, it offers reliable performance. The integrated SentryPlus Alert® flood sensor detects excessive relief valve discharge, enhancing safety. This compact assembly is approved for horizontal installation and has a maximum working pressure of 175 psi. It meets rigorous standards including ASSE 1013, UL, FM, and NSF certifications.

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Installation Guidelines

  • This backflow preventer is approved and designed for horizontal installation only. Ensure it is installed in strict accordance with the direction of the flow arrow for optimal performance.
  • When installing a drain line for Series 957 backflow preventers, use a 957AG air gap. Attach the air gap brackets directly onto the flood sensor.

Sensor Connectivity

  • The integrated SentryPlus Alert® flood sensor can extend its monitoring capabilities with an add-on sensor connection kit (available separately).
  • This kit enables integration with a Sensor Control Monitor, allowing maintenance alerts to be delivered to Building Automation Systems (BAS) via RS-485 Modbus or to the Nexa® platform through Wi-Fi connectivity.
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Additional Details

This 3 inch stainless steel reduced pressure zone (RPZ) assembly backflow preventer is designed to stop the reverse flow of liquids due to backpressure or backsiphonage, specifically where potential health hazards exist. Its compact design is approved for horizontal installation.

Features

  • Extremely compact and lighter than traditionally designed assemblies
  • Equipped with Domestic Non-Rising Stem (NRS) Shutoff Valves
  • Protects against backpressure and backsiphonage health hazards
  • Approved for horizontal installation in accordance with flow arrow direction

SentryPlus Alert® Technology

  • Includes a SentryPlus Alert® flood sensor to detect excessive water discharges from the relief valve
  • Add-on connection kit (sold separately) extends flood monitoring on compatible assemblies
  • Integrates with Sensor Control Monitor for maintenance alerts to BAS via RS-485 Modbus or Nexa® platform via Wi-Fi connectivity

Construction

  • Constructed with a 304 (Schedule 40) stainless steel housing and sleeve with quick access
  • Features corrosive resistant stainless steel bottom mounted pressure relief valve
  • Includes durable torsion spring check valves and convenient test cocks

Specifications

  • Size: 3 Inch
  • Valve Type: Domestic Non-Rising Stem (NRS) Shutoff Valves
  • Flood Sensor: SentryPlus Alert® Technology
  • Housing Material: 304 (Schedule 40) Stainless Steel

Materials

  • Elastomers: EPDM, Silicone, Buna-N
  • Torsion Spring Checks: Noryl®, Stainless Steel
  • Check Discs: Reversible Silicone or EPDM
  • Test Cocks: Lead Free* Bronze Body
  • Pins & Fasteners: 300 Series Stainless Steel
  • Springs: Stainless Steel

Performance

  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)
  • Maximum Working Pressure: 175 psi (12.1 bar)

Certificates & Approvals

  • Approved by Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California (FCCCHR-USC)
  • AWWA C511-97
  • ASSE 1013
  • CSA B64.4
  • UL Classified
  • FM Approved
  • NSF Certified to NSF/ANSI 61-G

FAQs

What is the primary function of this Reduced Pressure Zone (RPZ) assembly?

The primary function of this RPZ assembly is to prevent the reverse flow of non-potable liquids into the potable water supply, protecting against contamination from backpressure or backsiphonage, especially where health hazards exist.

What kind of flood sensor is included with this backflow preventer?

This backflow preventer features a SentryPlus Alert® flood sensor. It is designed to detect excessive water discharges from the relief valve, providing an early warning for potential flooding events.

What materials are used for the main housing and internal components?

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel. Internal components include EPDM, silicone, and Buna-N elastomers, Noryl® torsion spring checks, and 300 Series stainless steel pins and fasteners.

What are the key approvals and certifications for this product?

This backflow preventer is approved by ASSE 1013, AWWA C511-97, CSA B64.4, UL Classified, FM Approved, and NSF Certified to NSF/ANSI 61-G, ensuring it meets recognized safety and performance standards.

What is the maximum operating pressure and temperature range?

The maximum working pressure for this unit is 175 psi (12.1 bar). It can operate effectively within a temperature range of 33°F to 140°F (0.5°C to 60°C).

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