2 1/2 957N-OSY-FS

Item Number: F111590
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$10,045.35
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • 2 1/2 inch Reduced Pressure Zone assembly
  • 304 (Schedule 40) Stainless Steel Housing
  • Outside Stem and Yoke (OSY) Shutoff Valves
  • N-pattern orientation for horizontal installation
  • Integrated flood sensor with SentryPlus Alert technology
  • Compact design, 70% lighter than traditional models
  • Groove couplings for easy installation
  • Maximum Operating Pressure: 175 psi

Description

The Watts Series 957 2 1/2 inch Reduced Pressure Zone (RPZ) backflow preventer with a flood sensor protects potable water systems from contamination caused by backsiphonage or backpressure. This N-pattern assembly features 304 stainless steel construction and UL/FM approved OSY shutoff valves. Its compact, lightweight design includes groove couplings for easy installation. The integrated SentryPlus Alert flood sensor detects excessive water discharges from the relief valve, signaling potential flooding. This RPZ assembly is suitable for health hazard applications requiring reliable backflow prevention and flood monitoring. Item number F111590.

Help Me Connect

Installation Orientation

  • This assembly is approved for horizontal N pattern installation. Ensure installation aligns with the direction of the flow arrow.

Flood Sensor Connectivity

  • The integrated flood sensor requires an add-on connection kit for activation and communication.
  • Compatible with Building Automation Systems (BAS) via RS-485 Modbus when using the Sensor Control Monitor.
  • Can connect to the Nexa platform via Wi-Fi connectivity with appropriate connection kit options.

Pipeline Connections

  • Features groove couplings for ease of installation and integral pipeline adjustment.
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Additional Details

The Watts Series 957 2 1/2 inch Reduced Pressure Zone assembly backflow preventer provides essential protection to potable water systems from contamination due to backsiphonage or backpressure in health hazard applications. This compact and lightweight assembly features Outside Stem and Yoke (OSY) resilient seated gate valves and is approved for horizontal N pattern installation.

It includes a flood sensor with SentryPlus Alert technology to detect excessive water discharges from the relief valve, helping to prevent costly water damage.

Features

  • 2 1/2 inch size with OSY shutoff valves
  • 304 (Schedule 40) stainless steel housing and sleeve for durability
  • Extremely compact design that is 70% lighter than traditional models
  • Patented torsion spring checks for lowest pressure loss and unmatched ease of serviceability
  • Bottom mounted cast stainless steel relief valve
  • Groove couplings for ease of installation and pipeline alignment
  • Replaceable check disc rubber for simple maintenance

Flood Sensor Technology

  • Equipped with SentryPlus Alert technology for detecting continuous discharge from the relief valve
  • Add-on sensor connection kit extends flood monitoring capabilities
  • Integrates with Sensor Control Monitor to deliver maintenance alerts to BAS via RS-485 Modbus or the Nexa platform by Wi-Fi connectivity when paired with a connection kit
  • An add-on connection kit is required to activate the flood sensor; without it, the sensor acts as a passive component with no communication.

Specifications

General

  • Product Type: Reduced Pressure Zone Assembly Backflow Preventer
  • Series: 957
  • Size: 2 1/2 inch
  • Pattern: N-pattern
  • Shutoff Valves: Outside Stem and Yoke (OSY) Resilient Seated Gate Valves
  • Flood Sensor: Included

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 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
  • CULUS Classified
  • FM Approved
  • NSF Certified to NSF/ANSI 61-G

FAQs

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

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

How does the integrated flood sensor work?

The SentryPlus Alert flood sensor detects excessive water discharges from the relief valve. When activated with an add-on connection kit, it relays signals to facility personnel or integrates with systems like BAS or Nexa for alerts.

What material is the housing and sleeve made from?

The housing and sleeve of this backflow preventer are constructed from durable 304 (Schedule 40) stainless steel.

Can this backflow preventer be installed vertically?

No, this specific model (2 1/2 957N-OSY-FS) is approved for horizontal N pattern installation only, in accordance with the direction of the flow arrow.

What are the shutoff valves on this assembly?

This assembly features UL and FM Approved Outside Stem and Yoke (OSY) resilient seated gate valves.

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