2.5 957NRPDA-OSY-CFM-FS

Item Number: F111632
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$9,206.59
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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: 200.0 lb
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F - 140°F
  • Gate Valves: UL/FM Approved OSY Resilient Seated
  • Pattern: Horizontal N-Pattern Installation
  • Flood Detection: SentryPlus Alert Sensor on Relief Valve
  • Bypass Meter: Cubic Foot Per Minute (CFM) Meter

Description

The Watts 957NRPDA-OSY-CFM-FS is a 2 1/2 inch reduced pressure detector backflow preventer assembly designed to prevent reverse flow of liquids in non-potable water systems. Its compact design features a 304 stainless steel housing, UL/FM approved OSY gate valves, and grooved end connections for horizontal N-pattern installation. A built-in SentryPlus Alert flood sensor detects relief valve discharge, while a cubic foot per minute meter helps identify leaks. Rated for 175 psi and temperatures from 33°F to 140°F, it's suitable for fire protection and industrial applications.

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Connections

  • This 2 1/2 inch backflow preventer assembly is designed for horizontal N-pattern installation.
  • The main housing connects with groove end connections, allowing for integral pipeline adjustment.
  • Features UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves.
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Additional Details

This 2 1/2 inch reduced pressure detector backflow preventer assembly helps stop the reverse flow of liquids due to backpressure or backsiphonage, where potential health hazard exists. It is designed for horizontal installation and features an extremely compact and lighter design than traditional models.

Features

  • Flood sensor with SentryPlus Alert technology to detect continuous discharge from the relief valve.
  • Add-on sensor connection kit for extended 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.
  • 304 (Schedule 40) stainless steel housing and sleeve.
  • UL Classified and FM Approved outside stem and yoke resilient seated gate valves.
  • Approved for horizontal N pattern installation.
  • Furnished with a cubic foot per minute meter to detect underground leaks and unauthorized water use.
  • Bottom mounted cast stainless steel relief valve.
  • Compact design allows smaller enclosures to be used.
  • Torsion spring check valves and test cocks.
  • Corrosion resistant construction.
  • Groove fittings allow integral pipeline adjustment.

It is illegal to use this product in any plumbing system providing water for human consumption such as drinking or dishwashing in the United States. Before installing standard material product, consult your local water authority, building and plumbing codes.

Specifications

  • Size: 2 1/2 inch
  • Model: 957NRPDA-OSY-CFM-FS
  • Housing & Sleeve Material: 304 (Schedule 40) stainless steel
  • Gate Valve Type: UL Classified and FM Approved outside stem and yoke, resilient seated gate valves
  • Pattern: N-pattern orientation (Horizontal)
  • Relief Valve: Bottom mounted cast stainless steel relief valve
  • Flood Detection: Sensor on relief valve for flood detection (SentryPlus Alert technology)
  • Bypass Meter: Cubic foot per minute meter
  • Check Modules: Two independent torsion spring check modules
  • 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

Pressure - Temperature

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

Certificates & Approvals

  • ASSE: 1047
  • CSA: B64.4
  • UL Classified: Yes (BFG & OSY Only)
  • FM Approved: Yes (BFG & OSY Only)
  • AWWA: C511-97
  • Approved by: 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)

FAQs

What is the primary function of the Watts 957NRPDA-OSY-CFM-FS backflow preventer?

This assembly prevents the reverse flow of liquids due to backpressure or backsiphonage, particularly in systems where potential health hazards exist, but it is not for potable water applications.

What materials are used in the construction of this backflow preventer?

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel. It features a bottom-mounted cast stainless steel relief valve, Noryl® torsion spring checks, and 300 Series stainless steel pins and fasteners.

Does this backflow preventer include flood detection capabilities?

Yes, it features a flood sensor with SentryPlus Alert technology on the relief valve to detect continuous discharge. An add-on connection kit can extend monitoring capabilities.

What type of gate valves are included with this assembly?

The assembly comes with UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves for reliable operation and easy visual indication of their open/closed status.

What are the working pressure and temperature limits for this device?

The maximum working pressure for this backflow preventer is 175 psi (12.1 bar), and the operating temperature range is 33°F to 140°F (0.5°C to 60°C).

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