6 957-OSY-FxG-FS

Item Number: F191640
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$14,694.75
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Valve Size: 6 inch
  • Weight: 405.0 lb
  • Housing & Sleeve: 304 Stainless Steel
  • Shutoff Valves: OSY (Outside Stem and Yoke)
  • Connections: Flanged Inlet x Grooved Outlet
  • Flood Sensor: Integrated SentryPlus Alert® Technology
  • Max Working Pressure: 175 psi
  • Lead Content: Less than 0.25% lead by weight
  • Approvals: ASSE 1013, CSA B64.4, UL, FM, NSF

Description

The Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer is a 6-inch stainless steel assembly designed to protect potable water systems from contamination by backpressure or backsiphonage. Featuring 304 Schedule 40 stainless steel housing, OSY shutoff valves, and flanged inlet with grooved outlet connections, it is built for durability and ease of installation. An integrated SentryPlus Alert® flood sensor detects excessive relief valve discharge, offering advanced monitoring when paired with an add-on connection kit. This compact and lightweight unit is ASSE 1013, CSA B64.4, UL, FM, and NSF 61-G approved, making it suitable for health hazard applications. Item F191640.

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Connections

  • The inlet side features a flanged gate connection for secure attachment to your piping system.
  • The outlet side utilizes a grooved gate connection, providing flexibility for integral pipeline adjustment with grooved fittings.

Flood Sensor Connectivity

The integrated flood sensor requires an add-on connection kit (sold separately) for activation and communication. Available connection kits support integration with Building Management Systems (BMS), cellular networks, or via the Sensor Control Monitor for RS-485 Modbus and Nexa® platform (Wi-Fi) communication. Ensure proper drainage is provided by installing a Watts 957AG air gap with air gap brackets attached directly to the flood sensor.

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Additional Details

This 6 inch Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer protects potable water systems from contamination due to backpressure or backsiphonage, addressing potential health hazards. It is designed for horizontal installation and features an extremely compact and lightweight design compared to traditional models.

The assembly includes a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve.

Construction & Design

  • 304 (Schedule 40) stainless steel housing and sleeve
  • Features torsion spring check valves and a corrosive resistant stainless steel bottom mounted pressure relief valve
  • UL and FM approved outside stem and yoke resilient seated gate valves for shutoff
  • Flanged inlet gate connection and grooved outlet gate connection
  • Groove couplings for ease of installation and pipeline alignment
  • Replaceable check disc rubber for simplified maintenance
  • Compact design, making it significantly lighter than traditional assemblies

Flood Sensor Features

  • SentryPlus Alert® technology detects continuous discharge from the relief valve
  • When paired with an add-on connection kit (sold separately), the sensor relays alerts for potential flooding events
  • Compatible with BMS and cellular communication via connection kits
  • Integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi is possible with the Sensor Control Monitor connection kit

Specifications

General

  • Product Series: Watts Series 957
  • Valve Size: 6 inch
  • Shutoff Valves: Outside Stem and Yoke (OSY)
  • Connection Type: Flanged Inlet x Grooved Outlet
  • Flood Sensor: Integrated SentryPlus Alert® Technology
  • Installation: Horizontal

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
  • Pins & Fasteners: 300 Series Stainless Steel
  • Springs: Stainless Steel
  • Lead Content: Wetted surface contains less than 0.25% lead by weight

Performance

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

Certificates & Approvals

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

FAQs

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

Its primary purpose is to protect potable water systems from contamination caused by backpressure or backsiphonage, especially in health hazard applications.

What are the connection types for this 6-inch backflow preventer?

This model features a flanged inlet gate connection and a grooved outlet gate connection, allowing for versatile installation with appropriate piping.

How does the integrated flood sensor work?

The flood sensor with SentryPlus Alert® technology detects excessive water discharge from the relief valve. To activate alerts, an add-on connection kit (sold separately) is required to enable communication with BMS, cellular networks, or Nexa® platform via Wi-Fi.

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

The housing and sleeve are made from 304 (Schedule 40) stainless steel, with elastomers of EPDM, silicone, and Buna-N. Check discs are reversible silicone or EPDM.

Is this backflow preventer lead-free?

Yes, the wetted surface of this product, which contacts consumable water, contains less than 0.25% of lead by weight, meeting lead-free requirements.

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