3 957NRPDA-OSY-GPM

Item Number: 0111639
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$10,008.00
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 3 inch
  • Weight: 225.0 lb
  • Body Material: 304 (Schedule 40) Stainless Steel
  • Shutoff Valves: UL/FM Approved OSY Resilient Seated Gate Valves
  • Installation: Horizontal N-Pattern
  • Maximum Working Pressure: 175 PSI
  • Temperature Range: 33°F - 140°F
  • Flood Detection: Integrated Flood Sensor on Relief Valve
  • Leak Detection: Gallons/Minute (GPM) Metered Bypass

Description

This 3 inch Watts 957NRPDA Reduced Pressure Detector Assembly Backflow Preventer provides critical protection for potable water systems from contamination due to backsiphonage and backpressure. Ideal for fire sprinkler systems and other health hazard cross-connections, it features a durable 304 stainless steel body, UL/FM approved OSY shutoff valves, and a unique compact, lightweight design. The assembly includes a GPM meter for leak detection and a flood sensor on the relief valve for early warning of water discharges. Approved for horizontal N pattern installation, it ensures reliable performance and ease of serviceability. Item number 0111639.

Help Me Connect

Connections

  • This assembly features groove end connections for integral pipeline adjustment and simplified installation into your existing system.

Flood Sensor Activation

An add-on connection kit is required to activate the flood sensor's alert feature. Without this kit, the sensor acts as a passive component and will not communicate with other devices. Consult the RP/IS-957/957DCDA document for more information on the required connection kit.

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Additional Details

This 3 inch reduced pressure detector backflow preventer assembly is designed to prevent the reverse flow of fire protection substances and water of non-potable quality from being pumped or siphoned into the potable water supply. It protects against backsiphonage and backpressure in accordance with national plumbing codes and water authority requirements.

WARNING: 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.

Key Features

  • Provides protection in health hazard cross-connection applications, such as on fire sprinkler systems.
  • Features an extremely compact design that is 70% lighter than traditional designs, allowing for smaller enclosures.
  • Equipped with UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves.
  • Includes a gallons per minute (GPM) meter in the bypass line to detect underground leaks and unauthorized water use.
  • Incorporates a flood sensor on the relief valve to detect excessive water discharges, relaying a signal for corrective action.
  • Designed for horizontal N pattern installation.

Construction & Components

  • Housing and sleeve are constructed from 304 (Schedule 40) stainless steel.
  • Features two independent torsion spring check modules and a bottom-mounted cast stainless steel relief valve.
  • Patented torsion spring check design offers lowest pressure loss and unmatched ease of serviceability.
  • Groove fittings facilitate integral pipeline adjustment and ease of installation.
  • Check discs are replaceable and made of silicone or EPDM.
  • Elastomers are made of EPDM, silicone, and Buna 'N'.

Specifications

  • Product Type: Reduced Pressure Detector Assembly
  • Size: 3 inch
  • Installation Pattern: Horizontal N-Pattern
  • Shutoff Valves: OSY (Outside Stem and Yoke) Resilient Seated Gate Valves
  • Bypass: Metered with Gallons/Minute (GPM) Meter
  • Flood Detection: Sensor on Relief Valve

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
  • Relief Valve: Cast Stainless Steel

Pressure & Temperature

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

Certificates & Approvals

  • Approved by Foundation for Cross-Connection Control and Hydraulic Research at USC (excluding 10" N-pattern, 6" & 10" Z-pattern installations)
  • AWWA C511-97
  • ASSE 1047
  • CSA B64.4
  • UL Classified (C US)
  • FM Approved (C US)

Dimensions & Weight

  • Weight: 175 lbs (79 kg)

FAQs

What is the primary purpose of this backflow preventer assembly?

This reduced pressure detector assembly is designed to protect potable water systems from contamination by preventing the reverse flow of non-potable substances due to backsiphonage or backpressure, commonly found in fire protection systems.

What type of shutoff valves are included with this assembly?

This assembly is furnished with UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves, which allow for visual indication of valve position.

What is the function of the included gallons per minute (GPM) meter?

The GPM meter is integrated into the bypass line to detect any underground leaks or unauthorized use of water from the fire sprinkler system, helping to conserve water and prevent theft.

Does this backflow preventer include a flood detection feature?

Yes, it includes a flood sensor on the relief valve that detects excessive water discharges. This sensor can relay a signal to facility personnel for corrective action, helping to prevent flooding and costly damage when activated with an add-on connection kit.

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

The housing and sleeve are made from durable 304 (Schedule 40) stainless steel. Other components include EPDM, silicone, and Buna 'N' elastomers, Noryl® torsion spring checks, and lead-free bronze test cocks.

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