2.5 957Z-NRS-FS

Item Number: F111614
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$6,830.26
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 2 1/2 inch
  • Weight: 176.0 lb
  • Shutoff Valves: Non-Rising Stem (NRS) Gate
  • Installation Pattern: Z-Pattern
  • Flood Sensor: SentryPlus Alert® Technology
  • Housing Material: 304 Stainless Steel
  • Max Working Pressure: 175 psi
  • Temperature Range: 33°F - 140°F
  • Approvals: ASSE 1013, CSA B64.4, UL, FM, NSF/ANSI 61-G

Description

The Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer with 2 1/2 inch non-rising stem (NRS) shutoff valves is designed to protect potable water systems from contamination in health hazard applications by preventing backpressure and backsiphonage. This compact, Z-pattern assembly includes a SentryPlus Alert® flood sensor to detect excessive water discharge. Constructed with a durable 304 stainless steel body and groove couplings for easy installation, it operates up to 175 psi. It is ASSE 1013, CSA B64.4, UL, FM, and NSF/ANSI 61-G approved, offering reliable performance for demanding environments. Item number F111614.
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Additional Details

This 2 1/2 inch Reduced Pressure Zone (RPZ) assembly backflow preventer, Watts Series 957, protects potable water systems from contamination in health hazard applications, preventing reverse flow due to backpressure or backsiphonage. It features an extremely compact design and is 70% lighter than traditional designs, allowing for smaller enclosures and horizontal Z-pattern installation.

Key Features

  • Includes a SentryPlus Alert® flood sensor with technology to detect continuous discharge from the relief valve.
  • An add-on sensor connection kit can extend flood monitoring on compatible assemblies.
  • Integrates with the Sensor Control Monitor to deliver maintenance alerts to BAS via RS-485 Modbus or the Nexa® platform by Wi-Fi connectivity.
  • Features non-rising stem (NRS) resilient seated gate valves.
  • UL and FM approved outside stem and yoke resilient seated gate valves.
  • Constructed with a 304 (Schedule 40) stainless steel housing and sleeve.
  • Designed for horizontal Z-pattern installation.
  • Features replaceable check disc rubber.
  • Equipped with a bottom mounted cast stainless steel relief valve.
  • Groove couplings for ease of installation and pipe alignment.
  • Patented torsion spring checks provide lowest pressure loss.
  • 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. 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.

Specifications

  • Size: 2 1/2 inch
  • Series: 957
  • Assembly Type: Reduced Pressure Zone (RPZ)
  • Shutoff Valve Type: Non-rising stem (NRS) resilient seated gate valves
  • Installation Pattern: Z-pattern orientation
  • Flood Sensor: SentryPlus Alert® Technology
  • Housing & Sleeve Material: 304 (Schedule 40) stainless steel
  • 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 & Fasteners Material: 300 Series stainless steel
  • Spring Material: Stainless steel
  • 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)
  • AWWA C511-97
  • ASSE 1013
  • CSA B64.4
  • UL Classified
  • FM Approved
  • NSF Certified to NSF/ANSI 61-G

FAQs

What is the primary function of the Watts Series 957 RPZ assembly?

Its primary function is to protect potable water systems from contamination caused by backpressure or backsiphonage. It is commonly used in health hazard applications to maintain water quality.

What type of shutoff valves does this particular Series 957 model use?

This model utilizes non-rising stem (NRS) resilient seated gate valves for reliable shutoff control. These valves are designed for durability and ease of operation.

How does the SentryPlus Alert® flood sensor function on this backflow preventer?

The integrated SentryPlus Alert® flood sensor detects excessive water discharges from the relief valve. When paired with an optional add-on connection kit, it can relay alerts to facility personnel or integrate with building management systems via Modbus or Wi-Fi for remote monitoring.

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

The housing and sleeve are constructed from durable 304 (Schedule 40) stainless steel. Internal 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?

This backflow preventer is rated for a maximum working pressure of 175 psi (12.1 bar). It can operate within a temperature range of 33°F to 140°F (0.5°C to 60°C).

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