3 957-OSY-GxG-FS

Item Number: F112063
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$8,349.75
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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
  • Type: Reduced Pressure Zone Assembly
  • Shutoff Valves: OSY Gate Valves
  • Connections: Grooved Inlet x Grooved Outlet
  • Housing Material: 304 Stainless Steel
  • Maximum Working Pressure: 175 PSI
  • Temperature Range: 33°F - 140°F
  • Flood Sensor: SentryPlus Alert® Technology

Description

The Watts Series 957 Reduced Pressure Zone Assembly is a 3-inch lead-free stainless steel backflow preventer, engineered for potable water system protection against backpressure and backsiphonage contamination in health hazard applications. It features durable 304 stainless steel construction with UL Classified and FM Approved OSY gate valves and grooved inlet/outlet connections. A SentryPlus Alert® flood sensor detects relief valve discharges, requiring an add-on kit for active alerts via BMS, cellular, or Wi-Fi. This assembly offers lowest pressure loss due to patented torsion spring checks and is easily serviceable, with a maximum working pressure of 175 PSI and a temperature range of 33-140°F. Item number F112063.

Help Me Connect

Connections

  • The assembly features grooved inlet and grooved outlet connections for direct integration into a pipeline system.
  • Ensure compatibility with corresponding grooved piping system components.

Flood Sensor Activation

  • The integrated SentryPlus Alert® flood sensor requires an add-on connection kit to activate its communication features.
  • Connection kit options include compatibility with Building Management Systems (BMS), cellular communication, and the Sensor Control Monitor for integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.
  • Without an add-on connection kit, the flood sensor remains a passive component with no communication capabilities.

Installation Considerations

  • When installing a drain line for the backflow preventer, use 957AG air gaps and attach the air gap brackets directly onto the flood sensor for proper drainage.
  • Always consult local governing authorities for specific installation requirements and thoroughly read all product safety information.
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Additional Details

The Watts Series 957 Reduced Pressure Zone Assembly is a 3 inch lead free stainless steel backflow preventer designed to protect potable water systems from contamination due to backpressure or backsiphonage, particularly in health hazard applications.

This assembly features OSY (Outside Stem and Yoke) gate valves with grooved inlet and outlet connections, offering clear indication of valve position and preventing stem corrosion. It includes a flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve, signaling facility personnel for corrective action to prevent costly damage. An add-on connection kit is required to activate the sensor's alert features.

Features

  • Lead Free construction, with wetted surface containing less than 0.25% lead by weight
  • 304 (Schedule 40) stainless steel housing and sleeve for durability
  • OSY (Outside Stem and Yoke) gate valves are UL Classified and FM Approved, with grooved inlet and outlet connections
  • Integrated flood sensor with SentryPlus Alert® technology detects excessive water discharge from the relief valve
  • Patented torsion spring checks provide lowest pressure loss and drip-tight closure against reverse flow
  • Replaceable check disc rubber and reversible silicone or EPDM elastomers for ease of maintenance
  • Bottom mounted differential pressure relief valve and top mounted test cocks for serviceability
  • Compact design for installation flexibility

Installation and operation must comply with all required instructions, codes, and regulations, including providing proper drainage in the event of a discharge. An add-on connection kit is required to activate the flood sensor's communication features; without it, the sensor is passive.

Specifications

General

  • Product Type: Reduced Pressure Zone Assembly
  • Size: 3 inch
  • Brand: Watts
  • Model: 957-OSY-GxG-FS
  • SKU: F112063
  • Lead Free: Yes (wetted surface < 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)

Construction & Materials

  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Valve Type: OSY (Outside Stem and Yoke) Gate Valves
  • Inlet Connection: Grooved
  • Outlet Connection: Grooved
  • Check Discs: Reversible Silicone or EPDM
  • Elastomers: EPDM, Silicone, Buna-N
  • Torsion Spring Checks: Noryl®, Stainless Steel
  • Test Cocks Body: Lead Free* Bronze
  • Pins & Fasteners: 300 Series Stainless Steel
  • Springs: Stainless Steel
  • Flood Sensor: SentryPlus Alert® Technology

Certificates & Approvals

  • Approved By: Foundation for Cross-Connection Control and Hydraulic Research (FCCCHR-USC)
  • AWWA Standard: C511-97
  • ASSE Standard: 1013
  • CSA Standard: B64.4
  • UL Classified: Yes (for OSY valves)
  • FM Approved: Yes (for OSY valves)
  • NSF Certification: NSF/ANSI 61-G

FAQs

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

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

What type of shutoff valves does this 3-inch assembly use?

This 3-inch assembly utilizes UL Classified and FM Approved OSY (Outside Stem and Yoke) gate valves. These valves clearly indicate whether they are open or closed and are designed to prevent stem corrosion.

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

The integrated SentryPlus Alert® flood sensor detects excessive water discharges from the relief valve. To activate its alert and communication features, an add-on connection kit is required, compatible with systems like BMS, cellular, or Wi-Fi.

What are the connection types for this backflow preventer?

This backflow preventer features grooved inlet and grooved outlet connections, designed for direct and secure integration into compatible grooved piping systems.

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

The Watts Series 957 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).

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