4 957Z-NRS-FS

Item Number: F111616
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$10,017.01
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Nominal Pipe Size: 4 inch
  • Weight: 270.0 lb
  • Housing Material: 304 Stainless Steel
  • Shutoff Valves: Non-Rising Stem (NRS)
  • Installation Pattern: Z-Pattern
  • Integrated Flood Sensor with SentryPlus Alert technology
  • Maximum Operating Pressure: 175 PSI
  • Lead Free Wetted Surfaces: Yes (<0.25% lead)
  • Groove couplings for easy installation

Description

The Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer is a 4-inch assembly designed to protect potable water systems from contamination caused by backpressure or backsiphonage. Featuring a durable 304 stainless steel housing and non-rising stem (NRS) resilient seated gate valves, it ensures reliable performance. This Z-pattern unit includes an integrated flood sensor with SentryPlus Alert technology to detect excessive relief valve discharges, helping to prevent flooding and costly damage. Its compact, lightweight design and groove couplings simplify installation for health hazard applications. Item number F111616.

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Installation Orientation

This Reduced Pressure Zone assembly is approved for horizontal Z pattern installation. Ensure the assembly is installed in strict accordance with the direction of the flow arrow to maintain proper function and compliance with local codes.

Connection and Integration

  • The assembly utilizes groove couplings for straightforward installation and simplified pipeline alignment.
  • To activate the full flood monitoring capabilities of the integrated sensor, an add-on sensor connection kit is required (sold separately).
  • Connection kit options allow for integration with various building management systems (BMS) and cellular networks, or with the Sensor Control Monitor for BAS via RS-485 Modbus or the Nexa platform through Wi-Fi.
  • When installing a drain line for this Series 957 backflow preventer, use specific Watts 957AG air gaps. Attach the air gap brackets directly onto the flood sensor for proper discharge management.
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Additional Details

This 4 inch reduced pressure zone assembly backflow preventer helps stop the reverse flow of liquids due to backpressure or backsiphonage, protecting potable water systems where potential health hazards exist. Its compact design is ideal for various installations.

Features

  • Features a flood sensor with SentryPlus Alert technology to detect continuous discharge from the relief valve.
  • An add-on sensor connection kit (sold separately) is required to activate the flood sensor for extended flood monitoring and alerts.
  • When activated, the flood sensor integrates with the Sensor Control Monitor to deliver maintenance alerts to BAS via RS-485 Modbus or the Nexa platform by Wi-Fi connectivity.
  • Constructed with a 304 (Schedule 40) stainless steel housing and sleeve for durability.
  • Includes UL and FM approved outside stem and yoke resilient seated gate valves.
  • Features replaceable check disc rubber.
  • Equipped with a bottom mounted cast stainless steel relief valve.
  • Extremely compact design allows for use in smaller enclosures and is 70% lighter than traditional designs.
  • Groove couplings ensure ease of installation and pipeline alignment.
  • Approved for horizontal Z pattern installation when installed according to the flow arrow direction.
  • Patented torsion spring checks provide the lowest pressure loss and unmatched ease of serviceability.

Notice: An add-on 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.

Specifications

General

  • Product Type: Reduced Pressure Zone Assembly
  • Series: 957
  • Nominal Pipe Size: 4 inch
  • Shutoff Valve Type: Non-Rising Stem (NRS) Resilient Seated Gate Valves
  • Installation Pattern: Z-Pattern Orientation (Horizontal)
  • Flood Detection: Integrated Flood Sensor with SentryPlus Alert Technology
  • Drain Line Compatibility: Requires Watts 957AG air gaps (sold separately)
  • Lead Content: Wetted surface contains less than 0.25% lead by weight

Materials

  • Housing & Sleeve: 304 (Schedule 40) Stainless Steel
  • 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

Performance

  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Temperature Range: 33°F – 140°F (0.5°C – 60°C)

Certificates & Approvals

  • Approved by Foundation for Cross-Connection Control and Hydraulic Research (FCCCHR-USC)
  • AWWA Standard: C511-97
  • ASSE Standard: 1013
  • CSA Standard: B64.4
  • cULus Classified
  • FM Approved
  • NSF Certified to NSF/ANSI 61-G

FAQs

What is the primary purpose of the Watts 957Z Reduced Pressure Zone Assembly?

The primary purpose of this assembly is to protect potable water systems from contamination caused by backpressure or backsiphonage, especially in health hazard applications. It prevents the reverse flow of non-potable liquids into the clean water supply.

Does this 4-inch backflow preventer include a flood sensor?

Yes, this assembly features an integrated flood sensor with SentryPlus Alert technology. It detects excessive water discharges from the relief valve, signaling potential flooding events when connected with an add-on kit.

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

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel. Internal components like check discs and elastomers utilize durable materials such as EPDM, silicone, Buna-N, Noryl, and Lead Free* bronze for the test cocks.

What are the installation requirements for this backflow preventer?

This 4-inch assembly is approved for horizontal Z-pattern installation. It features groove couplings for easy pipeline adjustment. Ensure it is installed according to the flow arrow and all local plumbing codes.

What is the maximum operating pressure and temperature?

The Watts 957Z 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).

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