6 957-DNRS

Item Number: 0792322
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$27,288.20
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 6 inch
  • Weight: 405.0 lb
  • Housing Material: 304 Stainless Steel
  • Shutoff Valves: Domestic Non-Rising Stem (NRS) Gate Valves
  • Maximum Operating Pressure: 175 psi
  • Temperature Range: 33°F - 140°F
  • Lead-Free Construction
  • Extremely Compact and Lighter Design
  • Certified to ASSE 1013, CSA B64.4, NSF/ANSI 61-G

Description

The 6 inch Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer with domestic non-rising stem shutoff valves safeguards potable water systems from contamination due to backsiphonage or backpressure. Its compact, lightweight design features a durable 304 stainless steel housing, patented torsion spring check valves, and a lead-free bronze test cock body. Approved for horizontal installation, this assembly is ideal for health hazard cross-connections and continuous pressure applications. It offers unmatched ease of serviceability and is certified to ASSE 1013, CSA B64.4, and NSF/ANSI 61-G.

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Installation & Compatibility

  • This backflow preventer is approved for horizontal installation, requiring careful attention to the direction of flow.
  • Groove fittings facilitate integral pipeline adjustment for versatile installation.
  • Designed for protection in continuous pressure piping applications and critical cross-connections that present health hazards to the potable water supply.
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Additional Details

The 6 inch Watts Series 957 Reduced Pressure Zone (RPZ) assembly backflow preventer with domestic non-rising stem (NRS) shutoff valves is designed to protect potable water systems from contamination caused by backsiphonage or backpressure, meeting national plumbing codes and water authority requirements. This assembly is approved for horizontal installation and is ideal for continuous pressure piping applications and cross-connections identified as health hazards.

Features

  • Extremely compact design, significantly lighter than traditional designs
  • Housing and sleeve constructed from 304 (Schedule 40) stainless steel for durability
  • Includes domestic non-rising stem gate valves for shutoff
  • Patented torsion spring check valves provide lowest pressure loss
  • Features a corrosive-resistant stainless steel bottom-mounted pressure relief valve
  • Designed for unmatched ease of serviceability with no special tools required
  • Groove fittings allow integral pipeline adjustment
  • Equipped with ball valve type test cocks for easy testing
  • Wetted surface contains less than 0.25% lead by weight, making it lead-free

Specifications

  • Size: 6 inch
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Shutoff Valves: Domestic Non-Rising Stem (NRS) Gate Valves
  • 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
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)
  • Maximum Working Pressure: 175 psi (12.1 bar)

Certificates & Approvals

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

FAQs

What is a Reduced Pressure Zone (RPZ) assembly?

An RPZ assembly is a type of mechanical backflow preventer designed to protect potable water supplies from contamination by containing two independently operating check valves and a hydraulically operating differential pressure relief valve.

What does "Domestic NRS Shutoff Valves" mean?

"NRS" stands for Non-Rising Stem. Domestic NRS shutoff valves are gate valves where the stem does not rise out of the valve body when opened, making them suitable for installations with limited overhead clearance. "Domestic" indicates they meet specifications for common plumbing use.

What is the maximum operating pressure for this 6-inch RPZ assembly?

The maximum operating pressure for this 6-inch Watts Series 957 RPZ assembly is 175 psi (12.1 bar).

Is this product suitable for use with potable water?

Yes, this backflow preventer is designed for potable water systems. Its wetted surface contains less than 0.25% lead by weight, meeting lead-free requirements, and it is NSF/ANSI 61-G certified.

What are the key materials used in the construction of this backflow preventer?

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel. It also features Noryl® and stainless steel torsion spring checks, reversible silicone or EPDM check discs, and a lead-free bronze body for the test cocks.

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