4 957-OSY-GxG-FS

Item Number: F112064
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$9,240.00
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Reduced Pressure Zone Backflow Preventer: 4 inch
  • Weight: 265.0 lb
  • Housing Material: 304 (Schedule 40) Stainless Steel
  • Shutoff Valves: OSY Grooved Gate Valves
  • Maximum Operating Pressure: 175 psi
  • Temperature Range: 33°F - 140°F
  • Integrated Flood Sensor: SentryPlus Alert® technology
  • Lead Free* Construction
  • Certifications: UL, FM, ASSE 1013, AWWA C511-97, NSF/ANSI 61-G

Description

The Watts 4 inch Series 957 Reduced Pressure Zone (RPZ) backflow preventer provides critical protection against contamination from backpressure and backsiphonage in potable water systems. This lead-free assembly features a durable 304 stainless steel housing and UL/FM approved OSY grooved gate valves for easy visual open/closed indication. An integrated SentryPlus Alert flood sensor detects excessive water discharges from the relief valve, with optional kits for remote alerts. It offers a 175 psi maximum working pressure and a 33°F to 140°F temperature range, ensuring reliable performance in health hazard applications. Item number F112064.

Help Me Connect

Flood Sensor Connectivity

To activate the integrated flood sensor's alert features, an add-on connection kit is required. Without this kit, the sensor operates as a passive component without external communication. Connection kit options include those compatible with BMS (Building Management Systems) or cellular network communication, and the Sensor Control Monitor for integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.

Drain Line Installation

When installing a drain line for this Series 957 backflow preventer, utilize 957AG air gaps. Attach the air gap brackets directly onto the flood sensor for proper installation.

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Additional Details

The Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer, 4 inch, with OSY (Outside Stem and Yoke) grooved inlet and outlet gate valves, safeguards potable water systems from contamination due to backpressure or backsiphonage, particularly in health hazard applications. This lead-free assembly also features an integrated flood sensor for early leak detection.

Flood Sensor Technology

  • Includes a SentryPlus Alert® flood sensor to detect continuous water discharge from the relief valve.
  • Activates flood alerts when paired with an add-on sensor connection kit.
  • Connection kit options support integration with BMS (Building Management Systems), cellular communication, or the Sensor Control Monitor for BAS (Building Automation Systems) via RS-485 Modbus or Nexa® platform Wi-Fi.

Key Features

  • Lead Free* 304 (Schedule 40) stainless steel housing and sleeve for durability and corrosion resistance.
  • Features UL Classified and FM Approved OSY resilient seated gate valves with grooved end connections, indicating valve position.
  • Utilizes patented torsion spring checks for lowest pressure loss and unmatched ease of serviceability.
  • Replaceable check disc rubber and bottom-mounted cast stainless steel relief valve for simplified maintenance.
  • Compact design is approximately 70% lighter than traditional models.
  • Groove fittings enable integral pipeline adjustment.
  • Equipped with top-mounted test cocks for easy verification.

Specifications

  • Backflow Type: Reduced Pressure Zone (RPZ)
  • Nominal Pipe Size: 4 inch
  • Shutoff Valve Type: OSY (Outside Stem and Yoke) Resilient Seated Gate Valves
  • Connection Type: Grooved Inlet x Grooved Outlet
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Wetted Surface Lead Content: Less than 0.25% (Lead Free*)
  • Elastomer Material: EPDM, Silicone, Buna-N
  • Torsion Spring Check Material: Noryl®, Stainless Steel
  • Check Disc Material: Reversible Silicone or EPDM
  • Test Cock Material: Lead Free* Bronze Body
  • Pins & Fasteners Material: 300 Series Stainless Steel
  • Spring Material: Stainless Steel
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)
  • Maximum Working Pressure: 175 psi (12.1 bar)

Certificates & Approvals

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

FAQs

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

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

What material is the housing and sleeve made from?

The housing and sleeve are constructed from durable 304 (Schedule 40) stainless steel, ensuring resistance to corrosion and longevity.

How does the integrated flood sensor work?

The SentryPlus Alert® flood sensor detects excessive water discharges from the relief valve. When paired with an optional add-on connection kit, it can relay alerts to facility personnel or connected systems like BMS or BAS.

What are the connection types for this 4 inch model?

This model features OSY (Outside Stem and Yoke) resilient seated gate valves with grooved inlet and grooved outlet connections for easy installation and integral pipeline adjustment.

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

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).

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