8 957-DOSY-FS

Item Number: F113098
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$25,507.97
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Nominal Size: 8 inch
  • Weight: 610.0 lb
  • Housing & Sleeve: 304 (Schedule 40) Stainless Steel
  • Valve Type: OSY Resilient Seated Gate Valves
  • Flood Sensor with SentryPlus Alert Technology
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F - 140°F
  • Approved: AWWA C511-97, CSA B64.4, UL Classified, FM Approved
  • 70% Lighter than traditional designs

Description

This 8 inch Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer protects potable water systems from contamination due to backpressure or backsiphonage in health hazard applications. It features a compact design that is 70% lighter than traditional models, with 304 stainless steel housing and UL and FM Approved OSY gate valves. An integrated flood sensor with SentryPlus Alert technology detects continuous relief valve discharge, relaying alerts when paired with an add-on connection kit. Approved for horizontal installation, this assembly has a maximum working pressure of 175 psi and operates between 33°F and 140°F. Item number F113098.

Help Me Connect

This backflow preventer features groove couplings for straightforward installation and pipeline alignment. To fully activate the integrated flood sensor with SentryPlus Alert technology, an add-on sensor connection kit is required (sold separately). Without this kit, the sensor functions as a passive component with no communication capabilities.

Connection kit options enable integration with a Building Management System (BMS), cellular communication, or the Sensor Control Monitor. The Sensor Control Monitor further allows integration with Building Automation Systems (BAS) via RS-485 Modbus or the Nexa platform through Wi-Fi connectivity.

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Additional Details

This 8 inch Reduced Pressure Zone (RPZ) assembly backflow preventer provides essential protection for potable water systems from contamination due to backsiphonage or backpressure, particularly in health hazard applications. Its extremely compact design is up to 70% lighter than traditional models, making installation and maintenance easier, and is approved for horizontal installation.

The assembly features a 304 (Schedule 40) stainless steel housing and sleeve, patented torsion spring check valves for lowest pressure loss, and domestic UL and FM Approved outside stem and yoke (OSY) resilient seated gate valves. A bottom mounted cast stainless steel relief valve is included for reliable performance.

Flood Sensor with SentryPlus Alert Technology

  • Features an integrated flood sensor with SentryPlus Alert technology to detect continuous water discharges from the relief valve.
  • The sensor relays a signal to trigger notifications for facility personnel, helping to prevent flooding and reduce damage.
  • When paired with an add-on sensor connection kit (required for activation, sold separately), flood alerts can be delivered to a Building Management System (BMS) or via cellular network communication.
  • Integration with a Sensor Control Monitor (sold separately) enables connectivity with BAS via RS-485 Modbus or the Nexa platform through Wi-Fi.

Installation & Maintenance

  • Groove fittings allow for integral pipeline adjustment and ease of installation.
  • Designed for unmatched ease of serviceability.

It is crucial to thoroughly read all installation instructions and product safety information before beginning the installation. Watts is not responsible for alert failures due to connectivity issues, power outages, or improper installation.

The flood sensor does not replace the need to comply with all required instructions, codes, and regulations related to installation, operation, and maintenance, including the need for proper drainage in the event of a discharge.

Specifications

  • Nominal Size: 8 inch
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Valve Type: Outside Stem and Yoke (OSY) Resilient Seated Gate Valves
  • Relief Valve: Bottom Mounted Cast Stainless Steel
  • Check Discs: Reversible Silicone or EPDM
  • Torsion Spring Check Material: Noryl, Stainless Steel
  • Elastomers: EPDM, Silicone, Buna-N
  • Test Cocks: Lead Free* Bronze Body
  • Pins & Fasteners: 300 Series Stainless Steel
  • Springs: Stainless Steel
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)
  • Lead Content: <0.25% by weight (wetted surface)

Certificates & Approvals

  • Approved by the Foundation for Cross Connection Control and Hydraulic Research at The University of Southern California (FOCCCHR-USC)
  • AWWA C511-97
  • CSA B64.4
  • UL Classified (BFG & OSY Only)
  • FM Approved (BFG & OSY Only)
  • NSF/ANSI 61
  • NSF/ANSI 372
  • ASME

FAQs

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

This assembly protects the potable water system from contamination caused by backsiphonage or backpressure, ensuring compliance with national plumbing codes for health hazard applications.

Does this backflow preventer include a flood sensor?

Yes, it includes a flood sensor with SentryPlus Alert technology to detect excessive water discharges from the relief valve. An add-on connection kit is required to activate and relay alerts.

What is the maximum operating pressure and temperature range for this 8-inch model?

The maximum working pressure is 175 psi (12.1 bar). The assembly operates within a temperature range of 33°F to 140°F (0.5°C to 60°C).

What type of shutoff valves are included with this backflow preventer?

This 8-inch model is equipped with UL and FM Approved Outside Stem and Yoke (OSY) resilient seated gate valves, designed for reliable operation.

What materials are used for the housing and check components?

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel. Check discs are reversible Silicone or EPDM, and torsion spring checks are Noryl and stainless steel.

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