3 957-NRS-FS

Item Number: F111603
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$7,593.10
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • 3 inch Reduced Pressure Zone (RPZ) backflow preventer
  • Weight: 178.0 lb
  • Non-Rising Stem (NRS) resilient seated gate valves
  • Integrated flood sensor with SentryPlus Alert® technology
  • 304 (Schedule 40) stainless steel housing and sleeve
  • Maximum Operating Pressure: 175 PSI (12.1 bar)
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)
  • Lead Free* construction for potable water systems
  • Approved by ASSE 1013, AWWA C511-97, CSA B64.4, NSF/ANSI 61-G

Description

This 3 inch Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer safeguards potable water systems from contamination in health hazard applications. It features durable 304 stainless steel housing, non-rising stem (NRS) shutoff valves, and an integrated flood sensor with SentryPlus Alert® technology to detect excessive discharge. Designed for horizontal installation, this compact and lightweight assembly offers unmatched serviceability, a maximum working pressure of 175 PSI, and Lead Free* construction, meeting stringent industry approvals including ASSE 1013 and NSF/ANSI 61-G. Item number F111603.

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Installation Connections

  • This Watts Series 957 backflow preventer is designed with groove couplings for straightforward installation and precise pipeline alignment.
  • It is approved for horizontal installation.

Flood Sensor Activation & Communication

  • To activate the integrated flood sensor's alert features, an add-on sensor connection kit is required (sold separately). Without this kit, the sensor remains a passive component with no communication capabilities.
  • Connection kit options include compatibility with Building Automation Systems (BMS) and cellular network communication.
  • The sensor can also integrate with the Sensor Control Monitor (sold separately) to deliver maintenance alerts to BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi connectivity.
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Additional Details

The Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer assembly, 3 inch with non-rising stem (NRS) shutoff valves, provides crucial protection to potable water systems from contamination due to backpressure or backsiphonage in health hazard applications.

This assembly is designed for horizontal installation and features a compact design that is significantly lighter than traditional models.

Features

  • Equipped with non-rising stem (NRS) resilient seated gate valves for reliable shutoff.
  • Integrates a flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve.
  • Designed for unmatched ease of serviceability.
  • Features patented torsion spring checks for lowest pressure loss.
  • Includes a corrosive resistant stainless steel bottom mounted pressure relief valve.
  • Replaceable check disc rubber for easy maintenance.
  • Utilizes groove couplings for ease of installation and pipeline alignment.

Flood Sensor Technology

  • The integrated flood sensor actively detects excessive water discharges from the relief valve, signaling potential flooding events.
  • An add-on sensor connection kit is required to activate the flood sensor for communication capabilities.
  • Once activated, the sensor can deliver maintenance alerts to Building Automation Systems (BAS) via RS-485 Modbus or the Nexa® platform through Wi-Fi connectivity.
  • Compatible with BMS and cellular network communication options.

Specifications

  • Size: 3 inch
  • Product Type: Reduced Pressure Zone (RPZ) Assembly
  • Valve Type: Non-Rising Stem (NRS) Resilient Seated Gate Valves
  • Flood Sensor: SentryPlus Alert® Technology
  • Installation: Horizontal
  • Lead Content: Less than 0.25% by weight (wetted surface)

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
  • Relief Valve: Cast Stainless Steel

Performance

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

Certificates & Approvals

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

Dimensions & Weight (3 inch NRS)

  • Overall Length (A): 31 3/4 inches (806 mm)
  • Height (C): 10 1/4 inches (260 mm)
  • Depth (D): 6 11/16 inches (170 mm)
  • Weight: 147 lbs (67 kg)

FAQs

What is the primary purpose of the Watts Series 957 Reduced Pressure Zone (RPZ) assembly?

This RPZ assembly is designed to protect potable water systems from contamination caused by backpressure or backsiphonage, particularly in health hazard applications.

What type of shutoff valves are included with this 3 inch model?

This 3 inch Watts Series 957-NRS-FS model features non-rising stem (NRS) resilient seated gate valves for reliable shutoff.

How does the integrated flood sensor function, and what is required to activate it?

The flood sensor with SentryPlus Alert® technology detects excessive water discharges from the relief valve. An add-on sensor connection kit (sold separately) is required to activate its communication features and relay alerts.

Can this backflow preventer be used with potable water?

Yes, this product is Lead Free*, meaning its wetted surfaces contain less than 0.25% lead by weight, making it suitable for potable water systems. It is also NSF Certified to NSF/ANSI 61-G.

What are the main materials used in the construction of this assembly?

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel. Elastomers include EPDM, silicone, and Buna-N, and test cocks are made from Lead Free* bronze body.

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