4 994-DOSY-FS

Item Number: F439414
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$11,906.72
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Nominal Size: 4 inch
  • Weight: 350.0 lb
  • Body Material: 300 Series Stainless Steel
  • Shutoff Valves: Domestic OSY Resilient Seated Gate
  • Flood Detection: SentryPlus Alert® Flood Sensor
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F-110°F
  • Half the weight of competitive designs
  • No special tools required for servicing

Description

This Watts 4 inch Reduced Pressure Zone (RPZ) assembly backflow preventer safeguards potable water from contamination due to backpressure or backsiphonage, particularly in health hazard cross-connection scenarios. It features a lightweight, lead-free stainless steel body and domestic outside stem and yoke (OSY) shutoff valves. The integrated SentryPlus Alert® flood sensor detects excessive relief valve discharges, providing early warning when paired with an add-on connection kit. Its compact design and bottom-mounted relief valve simplify installation and maintenance, requiring no special tools for servicing. Maximum working pressure is 175 psi, with a continuous temperature range of 33°F-110°F.

Help Me Connect

Flood Sensor Connectivity

An add-on connection kit is required to activate the integrated flood sensor. Without this kit, the sensor functions passively without communication to other devices. The connection kit options include:

  • Building Management Systems (BMS)
  • Cellular communication
  • Sensor Control Monitor for integration with BAS via RS-485 Modbus
  • Sensor Control Monitor for integration with the Nexa® platform through Wi-Fi
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Additional Details

This 4 inch reduced pressure zone assembly backflow preventer is designed to protect potable water supplies from contamination due to backpressure or backsiphonage, specifically where potential health hazards exist.

Its compact, modular design facilitates easy maintenance and in-line repairs through a single access cover.

Key Components

  • Features a short lay length lead free stainless steel body.
  • Includes two domestic outside stem and yoke (OSY) resilient seated gate valves.
  • Equipped with corrosive resistant stainless steel bottom mounted relief valve.
  • Incorporates torsion spring check valves and test cocks.

Flood Sensor Technology

  • Contains a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve.
  • When paired with an add-on connection kit, the sensor activates to relay alerts for potential flooding events.
  • Connection kit options include BMS, cellular communication, and the Sensor Control Monitor for integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.

Design Advantages

  • Stainless steel construction provides long term corrosion resistance and maximum strength.
  • Half the weight of competitive designs, reducing installation and shipping costs.
  • Short end-to-end dimensions make retrofit easy.
  • Bottom mounted relief valve reduces clearance requirements when installed against an outside wall.
  • Torsion spring check valves provide maximum flow at low pressure drop.
  • No special tools required for servicing.
  • Compact construction allows for smaller enclosures.

Specifications

  • Product Type: Reduced Pressure Zone Assembly
  • Nominal Size: 4 inch
  • Body Material: 300 Series Stainless Steel
  • All Internal Metal Parts: 300 Series Stainless Steel
  • Check Assembly Material: Noryl®
  • Shutoff Valves: Domestic Outside Stem and Yoke (OSY) Resilient Seated Gate Valves
  • Relief Valve: Stainless Steel, Bottom Mounted
  • Check Valves: Thermoplastic with Stainless Steel Hinge Pins, Torsion Spring Design
  • Flood Detection: SentryPlus Alert® Flood Sensor
  • Temperature Range: 33°F-110°F (0.5°C - 43°C) continuous
  • Maximum Working Pressure: 175 psi (12.1 bar)

Certificates & Approvals

  • AWWA C511-92
  • CSA B64.5
  • UL Classified (OSY only)
  • FM Approved (OSY only)
  • ASSE 1013
  • Approved by Foundation for Cross Connection Control & Hydraulic Research at the University of Southern California (for sizes 2 1/2" to 6")

FAQs

What is the primary purpose of this 4 inch Reduced Pressure Zone assembly?

This assembly protects potable water supplies from contamination caused by backpressure or backsiphonage from hazardous materials, ensuring the safety of the water system.

What materials are used in the construction of this Watts Series 994 RPZ assembly?

The main valve body and all internal metal parts are constructed from 300 Series stainless steel for corrosion resistance, while the check assembly is made of Noryl®.

Does this backflow preventer include flood detection capabilities?

Yes, it features an integrated SentryPlus Alert® flood sensor designed to detect excessive water discharges from the relief valve, providing an alert when activated with an add-on connection kit.

What is the maximum operating pressure and temperature range for this 4 inch model?

The assembly has a maximum working pressure of 175 psi (12.1 bar) and a continuous temperature range of 33°F-110°F (0.5°C - 43°C).

Are special tools needed for servicing this RPZ assembly?

No, the design of this Watts Series 994 backflow preventer allows for servicing and maintenance without the need for special tools.

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