8 957N-NRS-FS

Item Number: F111612
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$21,350.97
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 8 inch
  • Weight: 667.0 lb
  • Assembly Type: Reduced Pressure Zone (RPZ)
  • Shutoff Valves: Non-Rising Stem (NRS)
  • Housing & Sleeve Material: 304 Stainless Steel
  • Maximum Operating Pressure: 175 PSI
  • Flood Sensor: SentryPlus Alert technology
  • Installation: Horizontal N-pattern
  • Lead-Free: Wetted surfaces < 0.25% lead

Description

The Watts Series 957 8 inch Reduced Pressure Zone (RPZ) backflow preventer with non-rising stem (NRS) shutoff valves is designed for horizontal N-pattern installation. It protects potable water systems from contamination caused by backpressure or backsiphonage in health hazard applications. Constructed with a durable 304 stainless steel housing and featuring an extremely compact, lightweight design, it offers easy installation and serviceability. An integrated SentryPlus Alert flood sensor detects excessive relief valve discharges, providing early warning when paired with an add-on connection kit. It handles a maximum operating pressure of 175 PSI. Item number F111612.

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Connections

This backflow preventer features groove couplings for ease of installation and pipeline alignment, simplifying its integration into existing or new piping systems.

Flood Sensor Connectivity

To activate the integrated flood sensor, an add-on connection kit is required. Without this kit, the sensor remains a passive component without external communication. Connection kit options include those compatible with Building Management Systems (BMS), cellular communication, and the Sensor Control Monitor, which enables integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.

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Additional Details

This 8 inch Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer with NRS shutoff valves and N-pattern orientation protects potable water systems from contamination due to backpressure or backsiphonage, especially in health hazard applications.

This extremely compact assembly is significantly lighter than traditional designs, making installation easier while maintaining robust protection.

Key Features

  • Provides protection against backpressure and backsiphonage contamination.
  • Designed for horizontal N-pattern installation.
  • Features a compact and lightweight design for easier handling and installation.
  • Groove couplings allow for integral pipeline adjustment and simplified installation.
  • Equipped with patented torsion spring checks for lowest pressure loss.
  • Designed for unmatched ease of serviceability.

Flood Sensor Technology

The assembly includes a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve. When paired with an add-on connection kit, the sensor relays alerts for potential flooding events, helping to prevent costly damage and limit flooding.

  • Sensor on relief valve provides flood detection.
  • Flood alerts are activated with an add-on sensor connection kit.
  • Compatible with Building Management Systems (BMS) and cellular network communication.
  • Integrates with the Sensor Control Monitor for maintenance alerts via RS-485 Modbus or Nexa® platform by Wi-Fi.

Construction

  • Housing and sleeve constructed from 304 (Schedule 40) stainless steel.
  • Features non-rising stem (NRS) resilient seated gate valves.
  • Includes replaceable check disc rubber.
  • Bottom mounted cast stainless steel relief valve.
  • Test cocks made from Lead Free* bronze body.
  • The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.

Specifications

  • Product Type: Reduced Pressure Zone (RPZ) Backflow Preventer
  • Nominal Size: 8 inch
  • Valve Type: Non-Rising Stem (NRS) Resilient Seated Gate Valves
  • Installation Pattern: N-pattern Horizontal
  • Housing & Sleeve Material: 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
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)
  • Maximum Working Pressure: 175 PSI (12.1 bar)
  • Lead Content: Wetted surface contains less than 0.25% lead by weight

Certificates & Approvals

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

FAQs

What is the primary purpose of the Watts Series 957 backflow preventer?

The primary purpose of this 8 inch Reduced Pressure Zone (RPZ) assembly is 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 model?

This model features 8 inch non-rising stem (NRS) resilient seated gate valves, which provide reliable shutoff and are integral to the assembly's functionality.

How does the SentryPlus Alert flood sensor function?

The SentryPlus Alert flood sensor detects excessive water discharges from the relief valve. When paired with an add-on connection kit, it can relay alerts to facility personnel or a Building Management System (BMS) to prevent flooding and damage.

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

The housing and sleeve are constructed from durable 304 (Schedule 40) stainless steel. Other components include EPDM, silicone, Buna-N elastomers, Noryl® torsion spring checks, and Lead Free* bronze body test cocks.

What is the maximum operating pressure and temperature range for this device?

This backflow preventer is designed for a maximum working pressure of 175 PSI (12.1 bar) and can operate within a temperature range of 33°F to 140°F (0.5°C to 60°C).

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