6 957-OSY-FS

Item Number: F111587
1 1
$14,720.75
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 6 Inch
  • Weight: 420.0 lb
  • Type: Reduced Pressure Zone (RPZ) Backflow Preventer
  • Shutoff Valves: Outside Stem and Yoke (OSY)
  • Housing Material: 304 Stainless Steel
  • Flood Sensor: SentryPlus Alert® Technology
  • Maximum Operating Pressure: 175 PSI
  • Temperature Range: 33°F - 140°F
  • Approvals: UL Classified, FM Approved, ASSE 1013, AWWA C511-97, NSF/ANSI 61-G

Description

The WATTS 6 inch Series 957 Reduced Pressure Zone (RPZ) backflow preventer with OSY shutoff valves is designed to protect potable water systems from contamination due to backpressure or backsiphonage in health hazard applications. Constructed with a 304 stainless steel housing and sleeve, this compact and lightweight assembly is UL Classified and FM Approved. It features a SentryPlus Alert® flood sensor to detect relief valve discharge, with optional connectivity kits for remote alerts. Rated for 175 PSI maximum working pressure and temperatures from 33°F to 140°F, it ensures reliable performance and easy serviceability with grooved connections. Item number F111587.

Help Me Connect

Connections

This WATTS Series 957 Reduced Pressure Zone backflow preventer features grooved couplings for both the inlet and outlet, designed for straightforward installation and precise pipe alignment. The OSY (Outside Stem and Yoke) resilient seated gate valves are integral to the assembly, providing reliable shutoff capabilities. For activating the flood sensor's advanced alert features, an add-on sensor connection kit is required, which can integrate with Building Management Systems (BMS), cellular networks, or the Nexa® platform via Wi-Fi.

View full details

Additional Details

The WATTS 6 inch Series 957 Reduced Pressure Zone (RPZ) backflow preventer with OSY shutoff valves provides robust protection for potable water systems against contamination from backpressure or backsiphonage, commonly found in health hazard applications. This assembly features an extremely compact, lightweight design, approved for horizontal installation.

The unit includes a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve. When paired with an optional add-on connection kit, this sensor actively relays alerts for potential flooding events, helping prevent costly damage. Connection kit options enable integration with Building Management Systems (BMS), cellular communication, or the Nexa® platform via Wi-Fi.

Features

  • Flood sensor with SentryPlus Alert® technology detects continuous discharge from the relief valve.
  • Add-on sensor connection kit extends flood monitoring on compatible assemblies (sold separately).
  • Integrates with Sensor Control Monitor for maintenance alerts to BAS via RS-485 Modbus or Nexa® platform by Wi-Fi connectivity.
  • 304 (Schedule 40) stainless steel housing and sleeve.
  • UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves.
  • Replaceable check disc rubber for easy maintenance.
  • Bottom mounted cast stainless steel relief valve.
  • Extremely compact design allows for smaller enclosures.
  • Groove couplings for ease of installation and pipe alignment.
  • Patented torsion spring checks provide lowest pressure loss.
  • Unmatched ease of serviceability.

NOTICE: The flood sensor does not replace the need to comply with all required installation instructions, codes, and regulations related to proper drainage in the event of a discharge. Watts is not responsible for alert failures due to connectivity issues, power outages, or improper installation. Always consult a trained product installer and local authorities for specific installation requirements.

Specifications

General

  • Product Type: Reduced Pressure Zone (RPZ) Backflow Preventer
  • Series: 957
  • Size: 6 Inch
  • Valve Type: Outside Stem and Yoke (OSY) Resilient Seated Gate Valves
  • Connection Type: Grooved Inlet and Grooved Outlet
  • Sensor: Flood Sensor with SentryPlus Alert® Technology

Materials

  • Housing & Sleeve: 304 (Schedule 40) Stainless Steel
  • Elastomers: EPDM, Silicone, Buna-N
  • Torsion Spring Checks: Noryl®, Stainless Steel
  • Check Discs: Reversible Silicone or EPDM
  • Test Cocks: Lead Free* Bronze Body
  • Pins & Fasteners: 300 Series Stainless Steel
  • Springs: Stainless Steel

Performance

  • Maximum Working Pressure: 175 PSI (12.1 bar)
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)

Dimensions & Weight

  • Overall Length (A): 43 1/2 inches (1105 mm)
  • Height to Top of OSY Handwheel (C OSY): 30 1/8 inches (765 mm)
  • Body Width (D): 16 inches (406 mm)
  • Inlet to Relief Valve Connection (G): 8 1/2 inches (216 mm)
  • Height to Centerline (P): 15 inches (381 mm)
  • Approximate Weight (OSY): 339 lbs (154 kg)

Certificates & Approvals

  • Approved By: Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California (FCCCHR-USC)
  • Standard: AWWA C511-97
  • Standard: ASSE 1013
  • Standard: CSA B64.4
  • Listing: cULus Classified (for OSY)
  • Listing: FM Approved (for OSY)
  • Certification: NSF Certified to NSF/ANSI 61-G
  • Lead Free*: Wetted surface contains less than 0.25% lead by weight.

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, particularly in health hazard applications, by preventing the reverse flow of liquids.

How does the flood sensor feature work on this backflow preventer?

The integrated flood sensor with SentryPlus Alert® technology detects excessive water discharges from the relief valve. When an add-on connection kit is installed, it can relay alerts to facility personnel via BMS, cellular communication, or Wi-Fi to prevent flooding.

What type of shutoff valves are included with this 6-inch model?

This model comes with UL Classified and FM Approved Outside Stem and Yoke (OSY) resilient seated gate valves, which are designed for reliable shutoff.

What are the main materials 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.

What are the installation requirements or considerations for this assembly?

This assembly is approved for horizontal installation and utilizes grooved couplings for ease of installation and pipe alignment. It is crucial to read all installation instructions and consult local governing authorities for specific installation requirements.

Related Products

1 4