2 1/2 957N-NRS-FS

Item Number: F111608
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$6,829.96
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 2 1/2 inch
  • Assembly Type: Reduced Pressure Zone (RPZ)
  • Shutoff Valves: Non-Rising Stem (NRS) Resilient Seated Gate Valves
  • Housing & Sleeve: 304 (Schedule 40) Stainless Steel
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F - 140°F
  • Flood Sensor: SentryPlus Alert® technology for discharge detection
  • Installation Pattern: Horizontal N-pattern

Description

This 2 1/2 inch Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer safeguards potable water systems from contamination due to backpressure and backsiphonage. Featuring 304 stainless steel housing, non-rising stem (NRS) resilient seated gate valves, and an extremely compact design, it is 70% lighter than traditional models. An integrated flood sensor with SentryPlus Alert® technology detects excessive relief valve discharges. It is approved for horizontal N-pattern installation and has a maximum working pressure of 175 psi. The wetted surfaces contain less than 0.25% lead. Item number F111608.

Help Me Connect

This 2 1/2 inch Series 957 backflow preventer features groove couplings for straightforward installation and pipeline alignment in a horizontal N pattern configuration. The integrated flood sensor can be activated with an add-on sensor connection kit to relay alerts. Connection kit options include compatibility with BMS, cellular communication, or the Sensor Control Monitor for integration with BAS via RS-485 Modbus or the Nexa platform via Wi-Fi.

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Additional Details

This 2 1/2 inch Watts Series 957N Reduced Pressure Zone (RPZ) assembly backflow preventer protects potable water systems from contamination by preventing reverse flow due to backpressure or backsiphonage. It features an integrated flood sensor with SentryPlus Alert® technology to detect continuous relief valve discharges and notify personnel when paired with an add-on connection kit.

Construction & Design

  • Extremely compact design, up to 70% lighter than traditional models
  • 304 (Schedule 40) stainless steel housing and sleeve with quick access sleeve
  • Groove fittings allow integral pipeline adjustment and ease of installation
  • Designed for horizontal N pattern installation
  • Unmatched ease of serviceability

Components

  • Two independent torsion spring check modules with replaceable elastomer discs
  • Patented torsion spring checks provide lowest pressure loss
  • Bottom mounted cast stainless steel relief valve
  • Resilient seated gate valves with non-rising stem
  • Test cocks

Flood Detection & Alerts

  • Integrated flood sensor with SentryPlus Alert® technology detects excessive water discharges
  • Add-on sensor connection kit activates flood alerts, compatible with BMS and cellular network communication
  • Sensor Control Monitor enables integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi

Lead Free Compliance

The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight, meeting 'Lead Free' requirements.

Specifications

  • Body Material: 304 (Schedule 40) Stainless Steel
  • Valve Type: Reduced Pressure Zone (RPZ) Assembly
  • Shutoff Valves: Non-Rising Stem (NRS) Resilient Seated Gate Valves
  • Nominal Size: 2 1/2 inch
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)
  • Wetted Surface Lead Content: Less than 0.25%

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 Body
  • Pins & Fasteners: 300 Series Stainless Steel
  • Springs: Stainless Steel

Dimensions (Nominal 2 1/2" NRS)

  • Length (A): 30 3/4 inch (781 mm)
  • Height (C): 9 3/8 inch (238 mm)
  • Width (D): 6 1/2 inch (165 mm)
  • Weight: 126 lb (57 kg)

Certificates & Approvals

  • AWWA C511-97
  • ASSE 1013
  • CSA B64.4
  • UL Classified
  • FM Approved
  • NSF Certified to NSF/ANSI 61-G
  • Approved by FCCCHR-USC

FAQs

What is the primary function of this backflow preventer?

This backflow preventer is designed to protect potable water systems from contamination caused by reverse flow due to backsiphonage or backpressure, in accordance with national plumbing codes.

What type of shutoff valves does this model use?

This model utilizes non-rising stem (NRS) resilient seated gate valves, which are UL Classified and FM Approved.

Does this backflow preventer include a flood sensor?

Yes, it includes an integrated flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve, helping prevent costly damage.

How is the flood sensor activated for alerts?

An add-on connection kit is required to activate the flood sensor's alert features. Without this kit, the sensor is a passive component.

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

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel, while internal components like torsion spring checks are Noryl® and stainless steel, and test cocks are Lead Free* bronze.

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