6 957Z-NRS-FS

Item Number: F111617
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$16,181.99
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Nominal Size: 6 inch
  • Weight: 427.0 lb
  • Z-Pattern orientation for horizontal installation
  • Non-Rising Stem (NRS) resilient seated gate valves
  • 304 (Schedule 40) stainless steel housing and sleeve
  • Flood sensor with SentryPlus Alert® technology
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F to 140°F
  • UL Classified and FM Approved

Description

The Watts Series 957 6 inch Reduced Pressure Zone Assembly is a backflow preventer designed to protect potable water systems from contamination from backpressure or backsiphonage. This Z-pattern assembly features UL and FM Approved NRS shutoff valves, a durable 304 (Schedule 40) stainless steel housing, and a Lead Free* bronze relief valve. It includes an integrated SentryPlus Alert® flood sensor to detect excessive discharge. With a compact, lighter design and groove couplings for ease of installation, it offers reliable contamination control for health hazard applications, operating at up to 175 psi and 140°F.

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Installation Pattern and Connections

This 6 inch reduced pressure zone assembly is specifically designed for Z-pattern horizontal installation to ensure optimal performance and code compliance. It utilizes groove fittings for straightforward installation, allowing for integral pipeline adjustment and ease of maintenance.

Flood Sensor Connectivity

  • The integrated flood sensor is a passive component that requires an add-on sensor connection kit to become active.
  • Connection kit options enable the sensor to relay alerts for potential flooding events and integrate with BMS (Building Management Systems) via RS-485 Modbus or the Nexa® platform through Wi-Fi.
  • When installing a drain line on Series 957 backflow preventers, use 957AG air gaps. Attach the air gap brackets directly onto the flood sensor.
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Additional Details

This 6 inch Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer is designed to protect potable water systems from contamination caused by backpressure or backsiphonage, especially in health hazard applications.

The extremely compact assembly features an integrated flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve, providing an advanced layer of protection against potential flooding. It is approved for Z-pattern horizontal installation.

Key Features

  • 6 inch nominal size with a Z-pattern orientation for specific installation needs.
  • Integrated flood sensor with SentryPlus Alert® technology detects excessive water discharges from the relief valve. NOTICE: An add-on sensor connection kit is required to activate the flood sensor. Without the connection kit, the sensor is a passive component that has no communication with any other device.
  • Constructed with a durable 304 (Schedule 40) stainless steel housing and sleeve.
  • Includes UL Classified and FM Approved non-rising stem (NRS) resilient seated gate valves.
  • Features replaceable check disc rubber for easy maintenance.
  • Equipped with a bottom mounted Lead Free* cast stainless steel relief valve.
  • Designed with groove fittings for straightforward installation and pipeline alignment.
  • Extremely compact design is 70% lighter than traditional designs, allowing for smaller enclosures.
  • Patented torsion spring checks provide the lowest pressure loss.

Specifications

  • Nominal Size: 6 inch
  • Pattern: Z-Pattern
  • Shutoff Valves: Non-Rising Stem (NRS) Resilient Seated Gate Valves
  • Housing Material: 304 (Schedule 40) Stainless Steel
  • Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Relief Valve Body: Lead Free* Bronze
  • Check Disc Material: Reversible Silicone or EPDM
  • Elastomers: EPDM, Silicone, Buna-N
  • Torsion Spring Checks Material: Noryl®, Stainless Steel
  • Pins & Fasteners Material: 300 Series Stainless Steel
  • Springs Material: Stainless Steel
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)
  • 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/ANSI 61-G

FAQs

What is the primary function of the Watts Series 957 backflow preventer?

This backflow preventer is designed to protect potable water systems from contamination caused by backpressure or backsiphonage, commonly used in health hazard applications.

How does the flood sensor feature work, and what is required for its activation?

The integrated flood sensor with SentryPlus Alert® technology detects excessive water discharges from the relief valve. To activate its full alert capabilities and communication, an add-on sensor connection kit is required.

What type of shutoff valves are included with this assembly?

This 6 inch Watts Series 957 assembly comes with UL Classified and FM Approved non-rising stem (NRS) resilient seated gate valves.

What are the material specifications for the housing and relief valve?

The assembly features a housing and sleeve constructed from 304 (Schedule 40) stainless steel, and a bottom-mounted relief valve with a Lead Free* bronze body.

Is this backflow preventer suitable for all installation patterns?

This particular model is designed for Z-pattern horizontal installation. Always confirm local codes and installation requirements for proper placement and function.

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