2.5 957-NRS-FS

Item Number: F111602
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$6,204.54
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 2 1/2 inch
  • Weight: 211.0 lb
  • Body Material: 304 Stainless Steel
  • Valve Type: Non-Rising Stem Resilient Seated Gate Valves
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F - 140°F
  • Features SentryPlus Alert® Flood Sensor
  • Approved for Horizontal Installation
  • UL Classified and FM Approved

Description

The Watts 2.5 inch 957-NRS-FS Reduced Pressure Zone (RPZ) backflow preventer safeguards potable water from contamination due to backpressure or backsiphonage. This 304 stainless steel assembly features non-rising stem (NRS) resilient seated gate valves and a SentryPlus Alert® flood sensor to detect excess water discharge. It is approved for horizontal installation and offers a compact design with grooved couplings for easy setup. Rated for 175 psi maximum working pressure and temperatures from 33°F to 140°F, it ensures reliable performance and compliance with AWWA, ASSE, CSA B64.4, UL, FM, and NSF standards. Item number F111602.

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Flood Sensor Connectivity

The integrated flood sensor with SentryPlus Alert® technology can be enhanced with an optional add-on connection kit. This kit allows the sensor to relay alerts for potential flooding events via several communication methods:

  • Building Management Systems (BMS)
  • Cellular communication
  • Integration with the Sensor Control Monitor, enabling communication with Building Automation Systems (BAS) via RS-485 Modbus or the Nexa® platform through Wi-Fi.

When installing a drain line on this Series 957 backflow preventer, use 957AG air gaps. Attach the air gap brackets directly onto the flood sensor.

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Additional Details

The 2 1/2 inch Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer provides protection against the reverse flow of liquids caused by backpressure or backsiphonage, where potential health hazards exist. This assembly is designed for horizontal installation.

This backflow preventer features a flood sensor with SentryPlus Alert® technology that detects excessive water discharges from the relief valve, signaling the need for corrective action and limiting potential flooding. An add-on connection kit can be used to activate the sensor for alerts via building management systems (BMS), cellular communication, or the Nexa® platform by Wi-Fi connectivity.

Features

  • 304 (Schedule 40) stainless steel housing and sleeve for durability.
  • UL and FM Approved outside stem and yoke resilient seated gate valves (NRS) for reliable shutoff.
  • Replaceable check disc rubber for easy maintenance.
  • Compact design allows for use in smaller enclosures.
  • Groove couplings facilitate ease of installation and pipe alignment.
  • Patented torsion spring checks provide lowest pressure loss for efficient operation.
  • Bottom mounted cast stainless steel relief valve.
  • Unmatched ease of serviceability.

Specifications

  • Size: 2 1/2 inch
  • Body Material: 304 (Schedule 40) Stainless Steel Housing & Sleeve
  • Test Cocks Material: Lead Free* Bronze Body
  • Pins & Fasteners Material: 300 Series Stainless Steel
  • Springs Material: Stainless Steel
  • Elastomers: EPDM, Silicone, Buna-N
  • Torsion Spring Checks Material: Noryl®, Stainless Steel
  • Check Discs Material: Reversible Silicone or EPDM
  • Valve Type: Non-Rising Stem (NRS) Resilient Seated Gate Valves
  • 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
  • UL Classified
  • FM Approved
  • NSF Certified to NSF/ANSI 61-G

FAQs

What is a Reduced Pressure Zone (RPZ) backflow preventer used for?

A Reduced Pressure Zone (RPZ) backflow preventer is designed to protect potable water systems from contamination by preventing the reverse flow of non-potable liquids due to backpressure or backsiphonage events.

What is the significance of the "NRS" in the product name?

"NRS" stands for Non-Rising Stem, indicating the type of gate valves used in the assembly. These resilient seated gate valves are UL Classified and FM Approved.

Does this backflow preventer include a flood sensor?

Yes, this assembly includes a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve, providing an early warning system for potential flooding.

What are the installation requirements for this Watts Series 957 backflow preventer?

This backflow preventer is approved for horizontal installation. When installing a drain line, it is recommended to use 957AG air gaps, attaching the air gap brackets directly onto the flood sensor.

What are the primary materials used in this backflow preventer's construction?

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel. The test cocks feature a Lead Free* bronze body, while pins, fasteners, and springs are made from 300 Series stainless steel.

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