10 957-NRS-FS

Item Number: F111607
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$29,929.12
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Assembly Size: 10 inch
  • Weight: 1131.0 lb
  • Shutoff Valves: Non-Rising Stem (NRS) Resilient Seated Gate Valves
  • Housing Material: 304 (Schedule 40) Stainless Steel
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F - 140°F
  • Features SentryPlus Alert® flood sensor
  • Lead Free* construction
  • Approved for horizontal installation

Description

The Watts 10 inch Series 957 Reduced Pressure Zone Assembly Backflow Preventer with Non-Rising Stem (NRS) shutoff valves is designed to protect potable water systems from contamination by backpressure or backsiphonage in health hazard applications. This compact and lightweight assembly features a durable 304 (Schedule 40) stainless steel housing and patented torsion spring checks for low pressure loss. It includes a SentryPlus Alert® flood sensor to detect continuous relief valve discharge, with optional kits for BMS, cellular, or Wi-Fi connectivity. Rated for 175 psi and 33-140°F, this lead-free unit is approved for horizontal installation. Item number F111607.

Help Me Connect

Flood Sensor Connection

  • An add-on connection kit is required to activate the flood sensor's alert features and enable communication. Without this kit, the sensor operates as a passive component.
  • Connection kit options allow compatibility with Building Management Systems (BMS), cellular communication, and integration with BAS via RS-485 Modbus or the Nexa® platform by Wi-Fi when using the Sensor Control Monitor.

Drain Line Installation

  • When installing a drain line on Series 957 backflow preventers, utilize 957AG air gaps.
  • Attach the air gap brackets directly onto the flood sensor for proper installation.

General Installation

  • Always refer to the full product installation and safety information provided by Watts.
  • Consult with governing authorities for local installation requirements and codes.
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Additional Details

The Watts Series 957 Reduced Pressure Zone Assembly provides comprehensive protection for potable water systems against contamination from both backpressure and backsiphonage. This 10-inch lead-free assembly is designed for health hazard applications and features non-rising stem (NRS) resilient seated gate valves and an integrated flood sensor.

This backflow preventer is exceptionally compact, up to 70% lighter than traditional designs, and approved for horizontal installation. It utilizes a 304 (Schedule 40) stainless steel housing and sleeve with groove fittings for easy installation and pipeline alignment.

Flood Detection & Alert System

  • Equipped with a flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve.
  • Relays a signal to facility personnel for corrective action, limiting potential flooding and costly damage.
  • Requires an add-on connection kit to activate the flood sensor's alert features and enable communication.
  • Compatible with Building Management Systems (BMS) and cellular networks when paired with an appropriate connection kit.
  • Integrates with BAS via RS-485 Modbus or the Nexa® platform by Wi-Fi connectivity when using the Sensor Control Monitor connection kit.

Design & Serviceability

  • Features patented torsion spring checks for the lowest pressure loss in its class.
  • Replaceable check disc rubber and a bottom-mounted cast stainless steel relief valve ensure unmatched ease of serviceability.
  • Test cocks are made from Lead Free* bronze body.

Installation Notice: Use of the flood sensor does not replace the need to comply with all required instructions, codes, and regulations related to installation, operation, and maintenance of this product, including the need to provide proper drainage in the event of a discharge. It is essential to thoroughly read all installation instructions and product safety information before beginning installation.

Specifications

  • Assembly Size: 10 inch
  • Shutoff Valves: Non-Rising Stem (NRS) Resilient Seated Gate Valves
  • Flood Sensor: Integrated with SentryPlus Alert® technology
  • Lead Content: Wetted surface contains less than 0.25% lead by weight
  • Installation: Approved for horizontal installation

Materials

  • Housing & Sleeve: 304 (Schedule 40) stainless steel
  • Elastomers: EPDM, silicone, and 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

  • 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), excluding 10" N-pattern installation as well as 6" and 10" Z-pattern installations
  • AWWA C511-97
  • ASSE 1013
  • CSA B64.4
  • NSF Certified to NSF/ANSI 61-G

FAQs

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

Its primary function is to protect potable water systems from contamination caused by backpressure or backsiphonage, especially in health hazard applications.

Does this backflow preventer come with a flood sensor?

Yes, it includes an integrated flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve. An add-on connection kit is required to activate its alert features.

What material is the housing and sleeve made from?

The housing and sleeve are constructed from durable 304 (Schedule 40) stainless steel, ensuring long-lasting performance.

What type of shutoff valves are included with this 10-inch assembly?

This 10-inch assembly is equipped with Non-Rising Stem (NRS) resilient seated gate valves for reliable shutoff.

What are the maximum operating pressure and temperature range for this unit?

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).

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