8 957-NRS-FS

Item Number: F111606
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$24,645.42
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 8 inch
  • Weight: 645.0 lb
  • Housing & Sleeve Material: 304 (Schedule 40) stainless steel
  • Shutoff Valves: Non-Rising Stem (NRS) Resilient Seated Gate Valves
  • Flood Sensor: SentryPlus Alert® technology included
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F to 140°F
  • Approvals: ASSE 1013, CSA B64.4, NSF/ANSI 61-G
  • Lead Free* wetted surface

Description

The Watts 8 inch Series 957 Reduced Pressure Zone Assembly backflow preventer protects potable water systems from contamination by preventing backpressure and backsiphonage. This model features durable 304 stainless steel housing and Non-Rising Stem (NRS) resilient seated gate valves. It includes an integrated flood sensor with SentryPlus Alert® technology for detecting excessive relief valve discharge, with alerts activated via an add-on connection kit. Its compact design and groove couplings simplify installation and maintenance. Rated for 175 psi maximum working pressure and temperatures from 33°F to 140°F.

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Connections

  • This backflow preventer connects to the pipeline using groove couplings, allowing for integral pipeline adjustment and ease of installation.

Flood Sensor Connectivity

  • The integrated SentryPlus Alert® flood sensor can be activated with an add-on connection kit.
  • Connection kit options include compatibility with Building Management Systems (BMS) and cellular communication.
  • The sensor can integrate with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi when utilizing the Sensor Control Monitor.
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Additional Details

The Watts 8 inch Series 957 Reduced Pressure Zone Assembly backflow preventer provides protection to potable water systems from contamination, preventing reverse flow due to backpressure or backsiphonage where potential health hazards exist.

This assembly is designed for horizontal installation and includes a flood sensor with SentryPlus Alert® technology.

Key Features

  • Equipped with a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve.
  • Designed with 304 (Schedule 40) stainless steel housing and sleeve for durability.
  • Features Non-Rising Stem (NRS) resilient seated gate valves for reliable shutoff.
  • Replaceable check disc rubber ensures long-term performance.
  • Includes a bottom mounted cast stainless steel relief valve.
  • Extremely compact design, up to 70% lighter than traditional designs, allowing for smaller enclosures.
  • Groove couplings facilitate easy installation and pipeline adjustment.
  • Patented torsion spring checks minimize pressure loss.
  • Offers unmatched ease of serviceability.

An add-on connection kit is required to activate the flood sensor's alert features; without it, the sensor is a passive component that has no communication with any other device.

Specifications

  • Size: 8 inch
  • Housing & Sleeve Material: 304 (Schedule 40) stainless steel
  • Shutoff Valves: Non-Rising Stem (NRS) Resilient Seated Gate Valves
  • Elastomer Materials: EPDM, Silicone, Buna-N
  • Torsion Spring Checks Material: Noryl®, Stainless Steel
  • Check Discs Material: Reversible Silicone or EPDM
  • Test Cocks Material: Lead Free* bronze body
  • Pins & Fasteners Material: 300 Series stainless steel
  • Springs Material: Stainless Steel

Performance Data

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

Certificates & Approvals

  • Foundation for Cross-Connection Control and Hydraulic Research (FCCCHR-USC)
  • AWWA C511-97
  • ASSE 1013
  • CSA B64.4
  • NSF Certified to NSF/ANSI 61-G

FAQs

What is the primary function of the Watts Series 957 Reduced Pressure Zone Assembly?

It protects potable water systems from contamination by preventing the reverse flow of liquids due to backpressure or backsiphonage, which could pose health hazards.

What material is the housing and sleeve made from?

The housing and sleeve of this backflow preventer are constructed from durable 304 (Schedule 40) stainless steel.

How does the flood sensor work and what is required to activate its alert features?

The integrated flood sensor with SentryPlus Alert® technology detects excessive water discharges from the relief valve. An add-on connection kit is required to activate its alert features for communication and notification.

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

This assembly has a maximum working pressure of 175 psi (12.1 bar) and an operating temperature range of 33°F to 140°F (0.5°C to 60°C).

What type of shutoff valves are used on this Watts Series 957 model?

This model features Non-Rising Stem (NRS) resilient seated gate valves.

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