4 957RPDA-DOSY-GPM-FS

Item Number: F113058
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$11,370.18
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 4 inch
  • Weight: 265.0 lb
  • Housing Material: 304 (Schedule 40) Stainless Steel
  • Features SentryPlus Alert® flood sensor technology
  • Includes domestic OSY resilient seated gate valves
  • Bypass Meter: Gallons per minute (GPM)
  • Maximum Working Pressure: 175 PSI
  • Approved for Horizontal N-Pattern installation
  • Certifications: ASSE, UL, FM, CSA B64.4

Description

The 4 inch Watts Series 957RPDA Reduced Pressure Detector Assembly is a backflow preventer designed to protect potable water systems from contamination caused by back-siphonage or backpressure in health hazard applications. It also monitors for unauthorized water use in fire protection systems. Featuring a compact 304 stainless steel body, OSY shutoff valves, and a GPM meter, this assembly includes a SentryPlus Alert® flood sensor to detect relief valve discharge. It supports horizontal N-pattern installation, operates up to 175 PSI, and is ASSE, UL, FM, and CSA B64.4 approved. Item number F113058.

Help Me Connect

Flood Sensor Activation

  • An add-on connection kit is required to activate the flood sensor's alert features. Without this kit, the sensor is passive and does not communicate with other devices.
  • Connection kit options include those compatible with Building Management Systems (BMS), cellular communication, and the Sensor Control Monitor for integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.

Pipeline Adjustments

  • Groove fittings are incorporated into the design to allow for integral pipeline adjustment during installation.
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Additional Details

This 4 inch Watts Series 957RPDA Reduced Pressure Detector Assembly (RPDA) backflow preventer protects potable water systems from contamination due to back-siphonage or backpressure, particularly in health hazard applications. It also monitors unauthorized water use from the fire protection system.

This assembly includes a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve. The sensor is installed externally and relays a signal for notification and corrective action, helping to limit flooding and costly damage. 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. Consult your local water authority, building, and plumbing codes before installation.

Features

  • Extremely compact design, up to 70% lighter than traditional designs
  • 304 (Schedule 40) stainless steel housing and sleeve for durability
  • Groove fittings allow integral pipeline adjustment and ease of serviceability
  • Patented torsion spring check valves provide lowest pressure loss
  • Replaceable check disc rubber
  • Includes domestic Outside Stem and Yoke (OSY) resilient seated gate valves
  • Bottom mounted cast stainless steel relief valve
  • Metered bypass (gallons per minute meter) detects leakage or theft of water from the fire sprinkler system
  • Sensor on relief valve for flood detection, activated with an add-on sensor connection kit
  • Flood alert feature compatible with BMS and cellular network communication, and Nexa® platform integration via Wi-Fi with Sensor Control Monitor

Specifications

General

  • Product Type: Reduced Pressure Detector Assembly (RPDA)
  • Size: 4 inch
  • Application: Health Hazard
  • Installation Pattern: Horizontal N-Pattern
  • Flood Sensor: Yes, with SentryPlus Alert® technology
  • Bypass Meter: Gallons per minute (GPM)
  • Shutoff Valves: Domestic Outside Stem and Yoke (OSY)
  • Servicing: No special tools required
  • Design: Extremely compact, 70% lighter than traditional designs

Materials

  • Housing & Sleeve: 304 (Schedule 40) stainless steel
  • Elastomers: EPDM, Silicone, Buna 'N'
  • Torsion Spring Checks: Noryl® silicone steel
  • Check Discs: Replaceable EPDM
  • Test Cocks: Lead Free* bronze body
  • Pins & Fasteners: 300 Series stainless steel
  • Springs: Stainless steel
  • Relief Valve: Bottom mounted cast stainless steel

Performance

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

Certificates & Approvals

  • ASSE® Approved
  • UL® Classified
  • FM® Approved
  • CSA B64.4

FAQs

What is the primary purpose of the Watts 957RPDA Reduced Pressure Detector Assembly?

Its primary purpose is to protect potable water systems from contamination due to back-siphonage or backpressure in health hazard applications, and to monitor unauthorized water use from fire protection systems.

What material is the housing of this backflow preventer made from?

The housing and sleeve of the Watts 957RPDA are constructed from durable 304 (Schedule 40) stainless steel.

Does this assembly include a flood detection feature?

Yes, it features a SentryPlus Alert® flood sensor on the relief valve to detect excessive water discharges and can be activated with an add-on connection kit for alert notifications.

What are the main certifications and approvals for this 4 inch RPDA?

This backflow preventer is ASSE® Approved, UL® Classified, FM® Approved, and CSA B64.4 certified, ensuring compliance with industry standards.

Can this product be used in systems supplying drinking water in the United States?

No, 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. Always consult local water authority and plumbing codes before installation.

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