8 957N-OSY-FS

Item Number: F111594
1 1
$32,876.33
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 8 inch
  • Weight: 709.0 lb
  • Shutoff Valves: OSY Resilient Seated Gate Valves
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Flood Sensor: SentryPlus Alert® Technology
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F - 140°F
  • Test Cocks Body Material: Lead Free* Bronze
  • Certifications: ASSE 1013, CSA B64.4, cULus, FM, NSF/ANSI 61-G

Description

The 8 inch WATTS Series 957 Reduced Pressure Zone Assembly Backflow Preventer safeguards potable water systems from contamination caused by backpressure or backsiphonage. This robust unit features 304 (Schedule 40) stainless steel housing, OSY resilient seated gate valves, and an integrated flood sensor with SentryPlus Alert® technology to detect excessive relief valve discharge. An add-on connection kit is required for sensor activation and alert relay. Its compact design and groove couplings simplify installation. Rated for 175 psi and 33-140°F, it is ASSE 1013, CSA B64.4, cULus, FM, and NSF/ANSI 61-G approved for horizontal N-pattern installation. Item F111594.

Help Me Connect

Installation & Orientation

  • This assembly is approved for horizontal N pattern installation. Ensure installation is in accordance with the direction of the flow arrow.
  • Features groove couplings for ease of installation and pipe alignment with connecting pipes.

Flood Sensor Connectivity

  • An add-on sensor connection kit is required to activate the integrated flood sensor and enable communication for alerts.
  • Connection kit options include compatibility with BMS (Building Management Systems), cellular communication, and the Sensor Control Monitor.
  • The Sensor Control Monitor enables integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.
View full details

Additional Details

This 8 inch reduced pressure zone assembly backflow preventer helps stop the reverse flow of liquids due to backpressure or backsiphonage, protecting potable water systems where potential health hazards exist. This extremely compact assembly is approved for horizontal N pattern installation, provided it is installed in accordance with the direction of the flow arrow.

Flood Detection & Alerts

  • Features a flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve, limiting flooding and costly damage.
  • An add-on sensor connection kit is required to activate the flood sensor, enabling communication for alerts.
  • Integrates with the Sensor Control Monitor to deliver maintenance alerts to Building Automation Systems (BAS) via RS-485 Modbus or the Nexa® platform through Wi-Fi connectivity.
  • Sensor relays a signal that triggers notification to facility personnel for corrective action.

Design & Construction

  • Features 304 (Schedule 40) stainless steel housing and sleeve.
  • Equipped with UL and FM Approved outside stem and yoke (OSY) resilient seated gate valves.
  • Includes replaceable check disc rubber and a bottom mounted cast stainless steel relief valve.
  • The extremely compact design is 70% lighter than traditional designs, allowing for smaller enclosures.
  • Groove couplings ensure ease of installation and pipe alignment.
  • Patented torsion spring checks provide lowest pressure loss and unmatched ease of serviceability.
  • Test cocks are included.

Specifications

  • Size: 8 inch
  • Type: Reduced Pressure Zone Assembly
  • Shutoff Valves: OSY (Outside Stem and Yoke) Resilient Seated Gate Valves
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Check Discs Material: Replaceable Elastomer Discs (Reversible Silicone or EPDM)
  • Elastomers: EPDM, Silicone, Buna-N
  • Torsion Spring Checks Material: Noryl®, Stainless Steel
  • Test Cocks Body Material: Lead Free* Bronze
  • Pins & Fasteners Material: 300 Series Stainless Steel
  • Springs Material: Stainless Steel
  • Wetted Surface Lead Content: Less than 0.25% by weight
  • Operating Orientation: Horizontal N-pattern
  • Flood Sensor: Integrated SentryPlus Alert® Technology

Performance Ratings

  • 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 Standard: C511-97
  • ASSE Standard: 1013
  • CSA Standard: B64.4
  • cULus Classified (for OSY shutoff valves)
  • FM Approved (for OSY shutoff valves)
  • NSF Certified to: NSF/ANSI 61-G

FAQs

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

This 8 inch backflow preventer is designed to protect potable water systems from contamination due to reverse flow caused by backpressure or backsiphonage, particularly in health hazard applications.

What materials are used for the main housing and check valve components?

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel. The check discs are made of replaceable elastomer rubber, and test cocks feature a Lead Free* bronze body.

How does the integrated flood sensor function?

The assembly includes a flood sensor with SentryPlus Alert® technology that detects excessive water discharges from the relief valve. To activate communication and alert capabilities, an add-on sensor connection kit is required.

What are the compatibility options for the flood sensor's alerts?

With an add-on connection kit, the flood sensor can integrate with Building Management Systems (BMS), cellular communication, or the Sensor Control Monitor for BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.

What are the key operating specifications for this backflow preventer?

This unit 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). It is designed for horizontal N-pattern installation.

Related Products

1 3