10 957-OSY-FS

Item Number: F111589
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$31,362.44
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Assembly Size: 10 inch
  • Weight: 924.0 lb
  • Body Material: 304 Stainless Steel (Schedule 40)
  • Shutoff Valves: OSY (Outside Stem and Yoke)
  • Features: Flood Sensor with SentryPlus Alert® Technology
  • Maximum Operating Pressure: 175 PSI
  • Certifications: ASSE 1013, CSA B64.4, UL, FM, NSF
  • Connection Type: Groove couplings
  • Installation: Horizontal

Description

The Watts Series 957 10 inch Reduced Pressure Zone Assembly with OSY shutoff valves and flood sensor is engineered to protect potable water from contamination due to backpressure or backsiphonage. This compact unit features a durable 304 stainless steel body, grooved couplings for easy horizontal installation, and an integrated flood sensor with SentryPlus Alert® technology that detects excessive relief valve discharge. It offers a maximum working pressure of 175 PSI and is certified by ASSE 1013, CSA B64.4, UL, FM, and NSF, ensuring reliable performance for health hazard applications.

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Installation & Compatibility

  • This backflow assembly is approved for horizontal installation only. Ensure proper drainage is provided at the point of discharge.
  • The assembly features groove couplings for straightforward installation and alignment with existing piping.
  • The integrated flood sensor can be enhanced with add-on connection kits for integration with Building Automation Systems (BAS) via RS-485 Modbus or the Nexa® platform through Wi-Fi, as well as cellular communication options.
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Additional Details

The 10 inch Watts Series 957 Reduced Pressure Zone Assembly with OSY shutoff valves and flood sensor is designed to prevent the reverse flow of potable water due to backpressure or backsiphonage, mitigating potential health hazards. This assembly is approved for horizontal installation and features a compact design, making it suitable for smaller enclosures.

The backflow preventer incorporates a flood sensor with SentryPlus Alert® technology that detects excessive water discharge from the relief valve. When paired with an add-on connection kit, the sensor activates to relay alerts for potential flooding events.

Construction & Design

  • Features a durable 304 (Schedule 40) stainless steel housing and sleeve
  • Equipped with UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves for reliable shutoff
  • Includes replaceable check disc rubber and bottom mounted cast stainless steel relief valve
  • Groove couplings are designed for ease of installation and pipe alignment
  • Extremely compact design for installations where space is limited
  • The Lead Free* bronze body test cocks provide reliable performance

Flood Monitoring

  • Integrated flood sensor with SentryPlus Alert® technology for detecting continuous discharge
  • Add-on sensor connection kit extends flood monitoring capabilities
  • Can integrate with a Sensor Control Monitor for maintenance alerts via BAS (RS-485 Modbus) or Nexa® platform (Wi-Fi)

Specifications

  • Product Series: Series 957
  • Assembly Size: 10 inch
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Elastomers: EPDM, Silicone, Buna-N
  • Torsion Spring Checks: Norvyl, Stainless Steel
  • Check Discs: Replaceable Silicone or EPDM
  • Test Cocks: Lead Free* Bronze Body
  • Pins & Fasteners: 300 Series Stainless Steel
  • Springs: Stainless Steel
  • Shutoff Valve Type: OSY (Outside Stem and Yoke) Resilient Seated Gate Valves
  • Flood Sensor: Integrated with SentryPlus Alert® Technology

Performance & Operating Conditions

  • 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
  • FM Approved
  • NSF Approved
  • AWWA C511-97

FAQs

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

Its primary function is to prevent the reverse flow of non-potable water into the potable water supply, protecting against contamination from backpressure or backsiphonage.

What type of shutoff valves does this backflow preventer use?

It uses UL Classified and FM Approved OSY (Outside Stem and Yoke) resilient seated gate valves, which allow for visual confirmation of the valve's open or closed position.

What is the purpose of the flood sensor feature?

The integrated flood sensor with SentryPlus Alert® technology detects excessive water discharge from the relief valve, providing an early warning system for potential flooding events.

Can this backflow preventer be installed vertically?

No, the Watts Series 957 Reduced Pressure Zone Assembly is specifically approved for horizontal installation only. It must be installed in accordance with the direction of the flow arrow and include proper drainage.

What materials are used for the main components of this assembly?

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

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