8 957N-DOSY

Item Number: 0113099
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$32,876.36
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 8 inch
  • Weight: 694.0 lb
  • Housing Material: 304 Stainless Steel
  • Valve Type: Domestic OSY Shutoff
  • Pattern: N-Pattern
  • Maximum Operating Pressure: 175 psi
  • Lead Free: Wetted surface contains < 0.25% lead
  • Easy Serviceability: Patented torsion spring check modules
  • Installation: Groove couplings for pipeline alignment

Description

This 8 inch Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer offers robust protection for potable water systems against contamination from backsiphonage and backpressure. Featuring an N-pattern configuration and domestic outside stem and yoke (OSY) shutoff valves, it is designed for health hazard applications and continuous pressure piping. The assembly boasts a compact, lightweight 304 stainless steel housing, patented torsion spring check modules for easy servicing, and groove couplings for simple installation and pipe alignment. It operates up to 175 psi and is approved for horizontal installation.

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Installation and Connection

  • This assembly is approved for horizontal installation, provided the backflow assembly is installed in accordance with the direction of the flow arrow.
  • The unit features groove couplings for ease of installation and integral pipeline adjustment, simplifying connection to your existing piping system.
  • Ensure proper drainage is provided in the event of a discharge from the relief valve.
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Additional Details

This 8 inch N pattern reduced pressure zone assembly backflow preventer helps prevent the reverse flow of fire protection substances and water of non-potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and/or backpressure in accordance with national plumbing codes and water authority requirements.

It is ideal for protection in continuous pressure piping applications and at cross-connections identified as health hazards and from other contaminants found at the service line entrance.

Features

  • Provides protection to the potable water system from contamination in health hazard applications.
  • Extremely compact design, allowing for smaller enclosures.
  • 70% lighter than traditional designs.
  • Constructed with 304 (Schedule 40) stainless steel housing and sleeve.
  • Features domestic outside stem and yoke (OSY) resilient seated gate valves.
  • Patented torsion spring check modules provide lowest pressure loss and unmatched ease of serviceability.
  • Groove couplings allow for integral pipeline adjustment and ease of installation.
  • Equipped with a bottom mounted cast stainless steel relief valve.
  • No special tools are required for servicing.

Specifications

  • Size: 8 inch
  • Pattern: N-Pattern
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Shutoff Valves: Domestic Outside Stem and Yoke (OSY) Resilient Seated Gate Valves
  • Check Discs: Reversible Silicone or EPDM
  • Elastomers: EPDM, Silicone, Buna-N
  • Torsion Spring Checks: Noryl®, Stainless Steel
  • Test Cocks Body Material: Lead Free* Bronze
  • Pins & Fasteners: 300 Series Stainless Steel
  • Springs Material: Stainless Steel
  • Lead Content: Wetted surface contains less than 0.25% lead by weight

Certificates & Approvals

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

FAQs

What is the primary function of this backflow preventer?

This 8 inch N pattern reduced pressure zone assembly backflow preventer prevents the reverse flow of non-potable water or substances into the potable water supply, protecting against contamination from backsiphonage and backpressure.

What type of shutoff valves does this model use?

This backflow preventer is equipped with domestic outside stem and yoke (OSY) resilient seated gate valves, which are designed for durability and reliable operation.

What is the maximum operating pressure and temperature for this assembly?

The maximum working pressure for this unit is 175 psi (12.1 bar). It can operate within a temperature range of 33°F to 140°F (0.5°C to 60°C).

Is this backflow preventer considered lead-free?

Yes, the wetted surface of this product, which comes into contact with consumable water, contains less than 0.25% of lead by weight, meeting lead-free requirements.

What materials are used for the main housing and relief valve?

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel, while the relief valve is a bottom-mounted cast stainless steel design, ensuring corrosion resistance and durability.

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