8 957-DNRS

Item Number: 0792323
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$48,647.00
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 8 Inch
  • Weight: 645.0 lb
  • Housing Material: 304 Stainless Steel
  • Shutoff Valves: Domestic Non-Rising Stem (NRS) Gate Valves
  • Protection Type: Backsiphonage and Backpressure
  • Lead Free: Yes (<0.25% lead by weight)
  • Maximum Working Pressure: 175 PSI
  • Temperature Range: 33°F - 140°F
  • Design: Extremely compact and lightweight

Description

This 8 inch stainless steel reduced pressure zone (RPZ) backflow preventer provides essential protection against backsiphonage and backpressure, safeguarding potable water from contamination. Featuring a durable 304 stainless steel housing, domestic non-rising stem (NRS) resilient seated gate valves, and patented torsion spring checks, it ensures reliable performance. Its compact, lightweight design allows for easier installation in continuous pressure applications. This assembly is lead-free compliant, approved for horizontal installation, and rated for a maximum working pressure of 175 PSI. It meets national plumbing codes and water authority requirements for health hazard protection.

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Connections & Installation

  • This 8 inch backflow preventer is approved for horizontal installation, following the direction of the flow arrow.
  • Features groove fittings that allow for integral pipeline adjustment, simplifying installation into existing systems.
  • Designed for continuous pressure piping applications and critical cross-connections where health hazard protection is required at the service line entrance.
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Additional Details

The 8 inch stainless steel reduced pressure zone assembly backflow preventer is designed to prevent the reverse flow of contaminated water into the potable water supply, protecting against backsiphonage and backpressure in accordance with national plumbing codes.

This assembly is ideal for continuous pressure piping applications and at cross-connections identified as health hazards, providing reliable protection at the service line entrance.

Features

  • 8 inch nominal size
  • Stainless steel body with a quick access sleeve
  • Domestic non-rising stem (NRS) gate valves with resilient seats
  • Corrosive resistant stainless steel bottom mounted pressure relief valve
  • Patented torsion spring check valves for lowest pressure loss
  • Extremely compact design, up to 70% lighter than traditional models
  • Groove fittings allow integral pipeline adjustment
  • Replaceable check disc rubber
  • Unmatched ease of serviceability
  • Lead Free* compliant construction (wetted surface contains less than 0.25% lead by weight)

Installation must comply with all required instructions, codes, and regulations. Inquire with governing authorities for local installation requirements.

Specifications

  • Product Type: Reduced Pressure Zone (RPZ) Backflow Preventer
  • Nominal Size: 8 Inch
  • Shutoff Valve Type: Domestic Non-Rising Stem (NRS) 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 Body Material: Lead Free* Bronze
  • Pins & Fastener 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)
  • Lead Content: Wetted surface contains less than 0.25% lead by weight

Certificates & Approvals

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

FAQs

What is the primary function of this 8 inch backflow preventer?

This 8 inch reduced pressure zone assembly backflow preventer is designed to prevent the reverse flow of contaminated water into the potable water supply, protecting against both backsiphonage and backpressure.

What type of shutoff valves are included with this model?

This specific model, 957-DNRS, features domestic non-rising stem (NRS) resilient seated gate valves, which are known for their durability and reliable sealing.

Is this backflow preventer compliant with Lead Free requirements?

Yes, this product is Lead Free compliant. The wetted surface of this assembly contains less than 0.25% of lead by weight, meeting current standards for potable water systems.

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

This backflow preventer 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).

Can this backflow preventer be installed horizontally?

Yes, this assembly is specifically approved for horizontal installation. It should be installed in accordance with the direction of the flow arrow and local plumbing codes.

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