3 957-OSY-FS

Item Number: F111585
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$8,360.40
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 3 inch
  • Weight: 233.0 lb
  • Shutoff Valves: OSY Resilient Seated Gate Valves
  • Housing Material: 304 (Schedule 40) Stainless Steel
  • Maximum Working Pressure: 175 PSI
  • Temperature Range: 33°F - 140°F
  • Flood Detection: Integrated SentryPlus Alert Sensor
  • Approvals: AWWA C511-97, ASSE 1013, CSA B64.4, CULUS, FM, NSF 61-G
  • Design: Compact and Lightweight

Description

This Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer is a 3-inch assembly designed to protect potable water systems from contamination caused by backsiphonage or backpressure in health hazard applications. Featuring a durable 304 stainless steel housing and UL/FM approved Outside Stem and Yoke (OSY) gate valves, it ensures reliable performance. An integrated SentryPlus Alert flood sensor detects excessive relief valve discharge, providing notifications when paired with an an add-on connection kit, which supports BMS, cellular, or Wi-Fi connectivity. The compact and lightweight design, along with grooved couplings, simplifies installation and service. Rated for 175 PSI and temperatures from 33°F to 140°F, it is AWWA C511-97, ASSE 1013, CSA B64.4, CULUS, FM, and NSF 61-G approved.

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System Connections

This Watts Series 957 Reduced Pressure Zone Backflow Preventer features flanged end connections on its Outside Stem and Yoke (OSY) shutoff valves, designed to integrate seamlessly into your piping system. The assembly utilizes groove couplings internally for secure attachment and integral pipeline adjustment, ensuring ease of installation and alignment.

Flood Sensor Connectivity

The integrated flood sensor operates as a passive component until activated by an optional add-on connection kit. These kits enable communication and alerts for facility personnel and are available with options compatible with BMS (Building Management Systems), cellular network communication, or through a Sensor Control Monitor for integration with BAS (Building Automation Systems) via RS-485 Modbus or the Nexa platform via Wi-Fi.

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Additional Details

This 3 inch Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer protects potable water systems from contamination due to backsiphonage or backpressure, commonly used in health hazard applications. It is approved for horizontal installation.

The assembly features a flood sensor with SentryPlus Alert technology to detect continuous discharge from the relief valve, providing notifications to facility personnel when paired with an add-on connection kit. This helps prevent flooding and costly damage.

Features

  • Equipped with a flood sensor for relief valve discharge detection.
  • Includes UL Classified and FM Approved Outside Stem and Yoke (OSY) resilient seated gate valves.
  • 304 (Schedule 40) stainless steel housing and sleeve for durability.
  • Groove couplings for integral pipeline adjustment and ease of installation.
  • Patented torsion spring checks engineered for lowest pressure loss.
  • Replaceable EPDM or silicone check disc rubber.
  • Bottom mounted cast stainless steel relief valve.
  • Extremely compact design, approximately 70% lighter than traditional models.
  • Add-on sensor connection kit enables flood alerts, compatible with BMS and cellular network communication, or integrates with BAS via RS-485 Modbus or Nexa platform via Wi-Fi.

Note: The flood sensor does not replace compliance with installation codes, regulations, or proper drainage requirements for discharge events.

Specifications

General

  • Product Type: Reduced Pressure Zone (RPZ) Backflow Preventer
  • Series: 957
  • Size: 3 inch
  • Shutoff Valves: Outside Stem and Yoke (OSY) Resilient Seated Gate Valves
  • Flood Detection: Integrated Flood Sensor with 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 Body
  • Pins & Fasteners: 300 Series Stainless Steel
  • Springs: Stainless Steel

Performance

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

Dimensions (Approximate)

  • Length (A): 31 3/4 inches (806 mm)
  • Height (C-OSY): 18 7/8 inches (479 mm)
  • Width (D): 10 1/4 inches (260 mm)
  • Weight: 161 lbs (73 kg)

Certificates & Approvals

  • Approved by: FCCCHR-USC
  • Standard: AWWA C511-97
  • Standard: ASSE 1013
  • Standard: CSA B64.4
  • Certification: CULUS Classified (for OSY)
  • Certification: FM Approved (for OSY)
  • Certification: NSF Certified to NSF/ANSI 61-G

FAQs

What is the primary function of the Watts Series 957 RPZ backflow preventer?

The primary function is to protect potable water systems from contamination caused by backsiphonage or backpressure, typically used in health hazard applications to maintain water quality.

What type of shutoff valves are included with this 3-inch assembly?

This assembly includes UL Classified and FM Approved Outside Stem and Yoke (OSY) resilient seated gate valves, which are designed for reliable flow control.

How does the integrated flood sensor work, and what connectivity options are available?

The flood sensor detects excessive water discharge from the relief valve. When paired with an optional add-on connection kit, it relays alerts via BMS, cellular communication, or through a Sensor Control Monitor that integrates with BAS via Modbus or Nexa via Wi-Fi.

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

This backflow preventer has a maximum working pressure of 175 PSI (12.1 bar) and operates within a temperature range of 33°F to 140°F (0.5°C to 60°C).

What materials are used for the housing and internal components?

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel. Elastomers include EPDM, silicone, and Buna-N, while test cocks feature Lead Free* bronze bodies, and pins/fasteners are 300 Series stainless steel.

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