3 957N-NRS-FS

Item Number: F111609
1 1
$7,977.94
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 3 inch
  • Weight: 235.0 lb
  • Type: Reduced Pressure Zone Assembly
  • Shutoff Valves: Non-rising stem (NRS)
  • Housing Material: 304 Stainless Steel
  • Flood Detection: SentryPlus Alert Flood Sensor
  • Maximum Working Pressure: 175 PSI
  • Lead Content: Less than 0.25% lead by weight
  • Approvals: ASSE 1013, AWWA C511-97, CSA B64.4, NSF/ANSI 61-G

Description

The Watts Series 957 is a 3-inch reduced pressure zone backflow preventer designed for potable water system protection against backpressure and backsiphonage health hazards. This compact, lead-free assembly features a 304 stainless steel housing, non-rising stem shutoff valves, and a bottom-mounted relief valve. It includes an integrated SentryPlus Alert flood sensor to detect excessive water discharge, which can be activated with an add-on connection kit for remote notifications. Approved by ASSE 1013, AWWA C511-97, and NSF/ANSI 61-G, it ensures reliable performance up to 175 PSI with horizontal N-pattern installation.

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Installation & Connections

  • Designed for horizontal N-pattern installation.
  • Features groove couplings for straightforward installation and pipeline alignment with compatible grooved piping systems.
  • The integrated flood sensor requires an add-on sensor connection kit to become active and relay alerts.
  • With a compatible connection kit, the sensor can integrate with BMS (Building Management Systems), enable cellular communication, or connect to a Sensor Control Monitor for data transmission via RS-485 Modbus or the Nexa® platform (Wi-Fi).
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Additional Details

The Watts Series 957 Reduced Pressure Zone Assembly is a 3 inch backflow preventer designed to protect potable water systems from contamination due to backpressure or backsiphonage where potential health hazards exist.

This compact assembly is approved for horizontal N-pattern installation and includes a flood sensor with SentryPlus Alert® technology to detect excessive water discharge from the relief valve.

Features

  • Provides protection against backpressure and backsiphonage in health hazard applications.
  • Extremely compact design, lighter than traditional backflow preventers.
  • Horizontal N-pattern installation.
  • Includes a flood sensor with SentryPlus Alert® technology to detect continuous relief valve discharge.
  • Non-rising stem (NRS) resilient seated gate valves.
  • Replaceable check disc rubber.
  • Bottom-mounted cast stainless steel relief valve.
  • Groove couplings for ease of installation and pipeline alignment.

Flood Sensor Technology

  • Features SentryPlus Alert® technology to detect continuous discharge from the relief valve.
  • An add-on sensor connection kit is required to activate the flood sensor. Without the connection kit, the sensor is a passive component with no communication capabilities.
  • Connects with BMS, cellular communication, or the Sensor Control Monitor for integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.

Materials

  • Housing & Sleeve: 304 (Schedule 40) stainless steel.
  • Wetted surface contacted by consumable water contains less than 0.25% of lead by weight.

Specifications

General

  • Product Type: Reduced Pressure Zone Assembly
  • Series: 957
  • Size: 3 inch
  • Shutoff Valves: Non-rising stem (NRS) resilient seated gate valves
  • Orientation: Horizontal N-pattern
  • Flood Detection: Integrated flood sensor with SentryPlus Alert® technology

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
  • Lead Content: Wetted surface contains less than 0.25% lead by weight

Performance

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

Certificates & Approvals

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

FAQs

What is the primary function of the Watts Series 957 Reduced Pressure Zone Assembly?

This 3-inch backflow preventer protects potable water systems from contamination due to backpressure and backsiphonage, especially in health hazard applications. It ensures that contaminated water does not flow back into the clean water supply.

How does the integrated flood sensor work?

The Series 957 includes a SentryPlus Alert® flood sensor on the relief valve to detect excessive water discharge. To activate alerts and enable communication with BMS or other platforms, an add-on sensor connection kit is required.

What type of shutoff valves does this backflow preventer use?

This assembly features non-rising stem (NRS) resilient seated gate valves. These valves provide reliable shutoff and are essential for isolating the backflow assembly during maintenance or testing.

What are the key materials used in the construction of this assembly?

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel for durability. Elastomers are EPDM, silicone, and Buna-N, while test cocks feature a Lead Free bronze body.

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

The Watts Series 957 is designed to operate with a maximum working pressure of 175 PSI (12.1 bar). It has a temperature range of 33°F to 140°F (0.5°C to 60°C).

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