8 957Z-NRS

Item Number: 0111618
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$21,352.49
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Nominal Size: 8 inch
  • Weight: 667.0 lb
  • Housing Material: 304 (Schedule 40) stainless steel
  • Shutoff Valves: Non-rising stem (NRS) gate valves
  • Maximum Working Pressure: 175 psi
  • Installation: Horizontal Z pattern
  • Relief Valve: Bottom mounted cast stainless steel
  • Connection Type: Groove couplings
  • Certifications: ASSE 1013, CSA B64.4, NSF/ANSI 61-G

Description

This 8 inch WATTS Series 957 Reduced Pressure Zone backflow preventer is designed for horizontal Z-pattern installations, protecting potable water from contamination due to backsiphonage and backpressure. It features a durable 304 stainless steel housing, non-rising stem (NRS) resilient seated gate valves, and a bottom-mounted stainless steel relief valve. Engineered for ease of serviceability and compact design, it operates up to 175 psi and is approved by ASSE 1013, CSA B64.4, and NSF/ANSI 61-G for health hazard applications in continuous pressure piping systems. Item number 0111618.

Help Me Connect

This WATTS Series 957 Reduced Pressure Zone Assembly is designed for horizontal Z pattern installation. Its groove couplings are engineered to facilitate straightforward installation and precise pipe alignment. When connecting a drain line to this Series 957 backflow preventer, utilize 957AG air gaps for proper discharge management.

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Additional Details

This 8 inch reduced pressure zone assembly backflow preventer helps prevent the reverse flow of fire protection substances and non-potable water into the potable water supply. It protects against backsiphonage and backpressure in accordance with national plumbing codes and water authority requirements.

This extremely compact and lightweight assembly is approved for horizontal Z pattern installation. It is ideal for continuous pressure piping applications and cross-connections identified as health hazards. This assembly features a 304 (Schedule 40) stainless steel body with a quick access sleeve, torsion spring check valves, resilient seated non-rising stem (NRS) gate valves, test cocks, and a corrosive resistant stainless steel bottom mounted pressure relief valve.

Features

  • 8 inch nominal pipe size
  • 304 (Schedule 40) stainless steel housing and sleeve for durability
  • Non-rising stem (NRS) resilient seated gate valves for reliable shutoff
  • Approved for horizontal Z pattern installation
  • Replaceable check disc rubber for easy maintenance
  • Bottom mounted cast stainless steel relief valve
  • Extremely compact design, significantly lighter than traditional designs
  • Patented torsion spring check modules for ease of serviceability
  • Groove couplings facilitate installation and pipe alignment
  • Maximum operating pressure of 175 psi (12.1 bar)

Specifications

  • Nominal Size: 8 inch
  • Housing & Sleeve Material: 304 (Schedule 40) stainless steel
  • Shutoff Valve Type: Non-rising stem (NRS), resilient seated gate valves
  • Installation Pattern: Z-pattern
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)
  • Elastomer Materials: EPDM, Silicone, Buna-N
  • Torsion Spring Check Material: Noryl®, stainless steel
  • Check Disc Material: Reversible silicone or EPDM
  • Test Cock Material: Lead Free* bronze body
  • Pins & Fastener Material: 300 Series stainless steel
  • Spring Material: Stainless steel

Certificates & Approvals

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

FAQs

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

Its primary function is to protect potable water systems from contamination caused by backsiphonage or backpressure from non-potable substances or fire protection fluids, complying with national plumbing codes.

What type of shutoff valves are included with this assembly?

This assembly features non-rising stem (NRS) resilient seated gate valves for reliable shutoff and maintenance.

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

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel, while the check discs are made from reversible silicone or EPDM, and torsion spring checks from Noryl® and stainless steel.

What is the maximum operating pressure and temperature range for this model?

This backflow preventer has a maximum working pressure of 175 psi (12.1 bar) and operates within a temperature range of 33°F to 140°F (0.5°C to 60°C).

Is this backflow preventer suitable for Z-pattern installation?

Yes, this model is specifically approved for horizontal Z pattern installation, ensuring proper protection for various cross-connection applications.

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