4 994RPDA-OSY-CFM-FS

Item Number: F438052
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$13,668.01
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: 300.0 lb
  • Flood Sensor: Yes, with SentryPlus Alert® technology
  • Main Valve Body Material: 300 Series Stainless Steel
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F – 110°F continuous
  • Shutoff Valves: OSY Resilient Seated Gate Valves
  • Meter Type: Cubic Feet per Minute (CFM)
  • Approvals: ASSE 1047, UL Classified, FM Approved

Description

The Watts 4 inch 994RPDA Reduced Pressure Detector Backflow Preventer Assembly is engineered to protect potable water supplies from contamination caused by backpressure or backsiphonage in health hazard and fire protection applications. It features a durable 300 Series stainless steel body, OSY resilient seated gate valves, and a CFM meter for leak detection. Equipped with SentryPlus Alert® flood sensing technology, it provides critical discharge monitoring. Its compact, lightweight design and bottom-mounted relief valve simplify installation and maintenance. The assembly is rated for 175 psi maximum working pressure and temperatures from 33°F to 110°F.

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Connection and Compatibility

  • This backflow preventer assembly is designed for installation at cross-connections to prevent backflow into potable water supplies.
  • The flood sensor can be connected to an add-on sensor connection kit (not included) for remote monitoring.
  • Compatible connection kit options include Building Automation Systems (BMS), cellular communication, and the Sensor Control Monitor for integration via RS-485 Modbus or the Nexa® platform (Wi-Fi).
  • Flange dimension in accordance with AWWA Class D.
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Additional Details

This 4 inch Watts 994RPDA Reduced Pressure Detector Backflow Preventer Assembly is designed to prevent the reverse flow of hazardous materials into potable water supplies due to backpressure or backsiphonage. It is suitable for health hazard applications and fire protection systems that use non-potable substances like glycerin or antifreeze.

Its compact and modular design ensures easy maintenance and efficient in-line repairs.

Key Features

  • Equipped with a flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve, alerting personnel to potential flooding events.
  • Compatible with an add-on sensor connection kit for extended flood monitoring and integration with Building Automation Systems (BAS) via RS-485 Modbus or the Nexa® platform through Wi-Fi.
  • Features a 300 Series stainless steel main valve body and internal parts, offering superior corrosion resistance and maximum strength.
  • The stainless steel body is half the weight of competitive designs, simplifying installation and reducing shipping costs.
  • Includes UL and FM Approved outside stem and yoke (OSY) resilient seated gate valves for reliable shutoff.
  • A cubic foot per minute (CFM) meter is included to detect underground leaks and unauthorized water use, helping monitor water consumption.
  • The bottom-mounted relief valve reduces clearance requirements when installed against an outside wall.
  • Utilizes torsion spring check valves for maximum flow at low pressure drop and thermoplastic and stainless steel check valves for trouble-free operation.
  • Compact construction allows for installation in smaller enclosures.

Important: The flood sensor does not replace compliance with all required installation, operation, and maintenance codes and regulations for backflow preventers. Proper drainage must be provided in the event of a discharge.

Warning: Watts is not responsible for alert failures due to connectivity issues, power outages, or improper installation. Always read all installation instructions and safety information thoroughly before beginning installation.

Specifications

General Specifications

  • Product Type: Reduced Pressure Detector Backflow Preventer
  • Series: 994RPDA
  • Nominal Size: 4 inch
  • Application: Health Hazard, Fire Protection
  • Operation: Automatic

Materials

  • Main Valve Body: 300 Series Stainless Steel
  • All Internal Metal Parts: 300 Series Stainless Steel
  • Check Assembly: Noryl®

Performance Data

  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Temperature Range: 33°F – 110°F (0.5°C – 43°C) continuous

Features Included

  • Flood Sensor: Yes, with SentryPlus Alert® technology
  • Shutoff Valves: Yes, OSY Resilient Seated Gate Valves
  • Meter Type: Cubic Feet per Minute (CFM) Meter

Certificates & Approvals

  • Standards: AWWA C511-92, CSA B64.5
  • Approvals: ASSE 1047, UL Classified, FM Approved

Dimensions & Weight (4 inch)

  • Length (A): 40 inches (1016 mm)
  • Width (C): 22 3/4 inches (578 mm)
  • Height (D): 10 1/2 inches (267 mm)
  • Gate Valve Height (G): 10 inches (254 mm)
  • Lay Length (L): 22 inches (559 mm)
  • P: 14 1/2 inches (368 mm)
  • S: 9 inches (229 mm)
  • Weight with Gates: 270 lbs (122 kg)
  • Weight without Gates: 67 lbs (30 kg)

FAQs

What is the primary purpose of the Watts 994RPDA backflow preventer?

The primary purpose is to prevent the reverse flow of hazardous materials, such as glycerin or antifreeze, from non-potable systems into the potable water supply due to backsiphonage or backpressure. It is suitable for health hazard and fire protection applications.

Does this backflow preventer include a flood sensor?

Yes, this assembly includes a flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve, providing alerts for potential flooding events.

What type of shutoff valves are included with this model?

This model comes with UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves, providing reliable shutoff capabilities.

What is the main body material and why is it beneficial?

The main valve body and all internal metal parts are constructed from 300 Series stainless steel, which provides long-term corrosion resistance, maximum strength, and is half the weight of competitive designs, reducing installation and shipping costs.

Can this backflow preventer detect water leaks or unauthorized water use?

Yes, the assembly is furnished with a cubic foot per minute (CFM) meter specifically designed to detect underground leaks and unauthorized water use, helping monitor water consumption.

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