10 957N-OSY-FS

Item Number: F111595
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$38,969.54
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 10 inch
  • Weight: 1091.0 lb
  • Backflow Type: Reduced Pressure Zone Assembly
  • Shutoff Valves: UL/FM Approved OSY Resilient Seated Gate
  • Housing & Sleeve: 304 Stainless Steel
  • Maximum Working Pressure: 175 PSI
  • Temperature Range: 33°F - 140°F
  • Features SentryPlus Alert Flood Sensor
  • Certified: ASSE 1013, CSA B64.4, UL, FM, NSF/ANSI 61-G

Description

The Watts Series 957 Reduced Pressure Zone Assembly is a 10-inch backflow preventer designed to protect potable water systems from contamination caused by backpressure or backsiphonage in health hazard applications. This compact assembly features 304 stainless steel housing and UL/FM approved OSY resilient seated gate valves. It includes a SentryPlus Alert flood sensor to detect excessive relief valve discharge, with optional connectivity for remote alerts. Rated for 175 PSI and temperatures from 33°F to 140°F, it offers reliable performance and is approved by ASSE, CSA, UL, FM, and NSF/ANSI 61-G standards. Its lighter design simplifies installation and maintenance.

Help Me Connect

Installation Orientation

  • This Watts 957N Reduced Pressure Zone Assembly is designed for horizontal N-pattern installation. Ensure the assembly is installed in accordance with the direction of the flow arrow for proper function.

Connections

  • The assembly utilizes groove fittings which allow for integral pipeline adjustment and ease of installation.
  • When installing a drain line for the relief valve, use 957AG air gaps. Attach the air gap brackets directly onto the flood sensor.
  • To activate the flood sensor's communication features, an add-on sensor connection kit is required. This kit enables compatibility with BMS and cellular network communication, or integration with a Sensor Control Monitor for BAS via RS-485 Modbus or Nexa platform via Wi-Fi.
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Additional Details

This 10 inch Reduced Pressure Zone Assembly Backflow Preventer provides essential protection to potable water systems from contamination due to backpressure or backsiphonage, particularly in health hazard applications. It is designed to prevent the reverse flow of liquids.

This assembly features a flood sensor with SentryPlus Alert technology to detect excessive water discharges from the relief valve, helping to prevent costly flooding and property damage.

Key Features

  • Equipped with OSY (Outside Stem and Yoke) resilient seated gate valves, UL Classified and FM Approved.
  • Constructed with a 304 (Schedule 40) stainless steel housing and sleeve for durability.
  • Includes a bottom-mounted cast stainless steel relief valve and replaceable check disc rubber for reliable performance.
  • Features patented torsion spring checks designed for the lowest pressure loss and unmatched ease of serviceability.
  • Extremely compact design, up to 70% lighter than traditional designs, allowing for smaller enclosures and easier installation.
  • Groove couplings facilitate integral pipeline adjustment and simplify installation.
  • The flood sensor provides flood alerts, activated with an add-on connection kit, compatible with BMS and cellular network communication.

NOTICE: An add-on connection kit is required to activate the flood sensor. Without the connection kit, the sensor is a passive component that has no communication with any other device.

Specifications

  • Size: 10 inch
  • Backflow Type: Reduced Pressure Zone Assembly
  • Shutoff Valve Type: OSY (Outside Stem and Yoke) Resilient Seated Gate Valves
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Elastomer Materials: EPDM, Silicone, Buna-N
  • Torsion Spring Check Material: Noryl®, Stainless Steel
  • Check Disc Material: Reversible Silicone or EPDM
  • Test Cock Material: Lead Free* Bronze
  • 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)
  • Pattern: N-pattern (Horizontal)

Certificates & Approvals

  • Approved by: Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California (FCCCHR-USC) (excluding 10" N-pattern installation)
  • Standard: AWWA C511-97
  • Certification: ASSE 1013
  • Certification: CSA B64.4
  • Certification: UL Classified (for OSY valves)
  • Certification: FM Approved (for OSY valves)
  • Certification: NSF/ANSI 61-G

FAQs

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

The Watts Series 957 Reduced Pressure Zone Assembly protects potable water systems from contamination. It prevents the reverse flow of non-potable liquids into the clean water supply due to backpressure or backsiphonage, particularly in health hazard environments.

What type of shutoff valves are included with this assembly?

This assembly comes with UL Classified and FM Approved OSY (Outside Stem and Yoke) resilient seated gate valves. These valves provide reliable isolation and shutoff capabilities for the backflow preventer.

How does the integrated flood sensor work?

The Series 957 features a SentryPlus Alert flood sensor on the relief valve that detects excessive water discharges. When paired with an add-on connection kit, this sensor can relay signals for corrective action, sending alerts to facility personnel or integrated building management systems to prevent flooding.

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

The housing and sleeve are made from 304 (Schedule 40) stainless steel. Elastomers include EPDM, silicone, and Buna-N, while test cocks feature a Lead Free* bronze body. Internal components like springs and fasteners are stainless steel.

What are the temperature and pressure limitations for this device?

The Watts Series 957 Reduced Pressure Zone Assembly has a maximum working pressure of 175 PSI (12.1 bar). Its operational temperature range is 33°F to 140°F (0.5°C to 60°C).

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