4 957N-NRS-FS

Item Number: F111610
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$10,016.37
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Product Type: Reduced Pressure Zone Assembly
  • Weight: 275.0 lb
  • Nominal Size: 4 inch
  • Shutoff Valve Type: NRS Resilient Seated Gate
  • Flood Sensor: SentryPlus Alert® Technology
  • Housing Material: 304 Stainless Steel
  • Maximum Working Pressure: 175 PSI
  • Temperature Range: 33°F - 140°F
  • Approvals: ASSE, AWWA C511-97, CSA B64.4, UL, FM, NSF

Description

The 4 inch WATTS Series 957N Reduced Pressure Zone Assembly Backflow Preventer is designed to protect potable water from contamination caused by backpressure or back-siphonage in health hazard applications. This compact, lead-free assembly features a 304 stainless steel body, NRS resilient seated gate valves, and patented torsion spring checks. An integrated SentryPlus Alert® flood sensor detects continuous discharge, providing an early warning. It is approved for horizontal N pattern installation and features groove couplings for easy setup. Rated for 175 PSI and temperatures from 33°F to 140°F, it holds ASSE, AWWA C511-97, CSA B64.4, UL, FM, and NSF approvals. Item number F111610.

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Installation Orientation

  • This Watts Series 957N backflow preventer is approved for horizontal N pattern installation.
  • Ensure the assembly is installed in accordance with the direction of the flow arrow to function correctly.
  • Groove couplings are provided for ease of installation and proper pipe alignment.

Flood Sensor Integration

  • The integrated flood sensor requires an add-on connection kit (sold separately) to activate communication features.
  • With the connection kit, the sensor can relay alerts for potential flooding events via BMS (RS-485 Modbus) or the Nexa® platform through Wi-Fi, or cellular communication.
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Additional Details

This 4 inch WATTS Series 957N Reduced Pressure Zone Assembly Backflow Preventer protects potable water from contamination by preventing the reverse flow of liquids due to backpressure or backsiphonage in potentially hazardous cross-connections. It is designed for horizontal N pattern installation and features a compact, lightweight stainless steel body.

The assembly includes a flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve, providing an early warning of potential flooding events. An add-on connection kit (sold separately) is required to activate the sensor's communication capabilities for remote alerts.

Features

  • Equipped with UL and FM approved outside stem and yoke resilient seated gate valves.
  • Includes a bottom mounted cast stainless steel relief valve for reliable performance.
  • Patented torsion spring checks provide optimal performance and unmatched ease of serviceability.
  • Constructed with a 304 (Schedule 40) stainless steel housing and sleeve for durability.
  • Groove couplings facilitate easy installation and pipeline alignment.
  • Replaceable silicone or EPDM check disc rubber.
  • 4-turn quarter-turn ball valve shutoffs for quick operation.
  • Extremely compact design allows for smaller enclosure use.

NOTICE: An add-on connection kit is required to activate the flood sensor for communication with other devices. Without the kit, the sensor is a passive component. The flood sensor does not replace the need to comply with all required instructions, codes, and regulations related to installation, operation, and maintenance of this product, including the need to provide proper drainage in the event of a discharge.

Specifications

  • Product Type: Reduced Pressure Zone Assembly Backflow Preventer
  • Nominal Size: 4 inch
  • Model Series: 957N
  • Pattern: N Pattern (Horizontal)
  • Valve Type: NRS (Non-Rising Stem) Resilient Seated Gate Valves
  • Shutoff Valves: 4-turn quarter-turn ball valve
  • Flood Sensor: Integrated with SentryPlus Alert® technology
  • Maximum Working Pressure: 175 PSI (12.1 bar)
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)

Materials

  • Housing & Sleeve: 304 (Schedule 40) Stainless Steel
  • Elastomers: EPDM, Silicone, Buna-N
  • Torsion Spring Checks: Noryl, Stainless Steel
  • Check Discs: Reversible Silicone or EPDM
  • Test Cocks: Lead Free* Bronze
  • Pins & Fasteners: 300 Series Stainless Steel
  • Springs: Stainless Steel

Certificates & Approvals

  • ASSE
  • AWWA C511-97
  • CSA B64.4
  • UL Classified
  • FM Approved
  • NSF Approved
  • Patented Design
  • Approved by FOCCCHR-USC

FAQs

What is the primary function of the Watts Series 957N backflow preventer?

Its primary function is to protect potable water from contamination by preventing the reverse flow of non-potable liquids due to backpressure or backsiphonage, particularly in health hazard cross-connections.

Does this backflow preventer include a flood sensor?

Yes, it features an integrated flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve, providing early warning of potential flooding.

Is an additional kit required for the flood sensor to communicate alerts?

Yes, an add-on connection kit (sold separately) is required to activate the flood sensor's communication capabilities for remote alerts via BMS, cellular communication, or the Nexa® platform.

What are the installation requirements for this assembly?

The Watts Series 957N is approved for horizontal N pattern installation. It must be installed in accordance with the direction of the flow arrow and all local codes and regulations.

What materials are used for the main components?

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel. The check discs are reversible silicone or EPDM, and test cocks are made from Lead Free* bronze.

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