4 994RPDA-LF-CFM-FS

Item Number: F438054
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$10,782.75
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Nominal Pipe Size: 4 inch
  • Weight: 75.0 lb
  • Body Material: 300 Series Stainless Steel
  • Maximum Operating Pressure: 175 psi
  • Temperature Range: 33°F – 110°F continuous
  • Flood Sensor: Included with SentryPlus Alert® technology
  • Meter Type: Cubic Feet Per Minute (CFM)
  • Shutoff Valves: Not included (LF)
  • Certifications: AWWA C511-92, CSA B64.5, ASSE 1047, FM Approved, UL Classified

Description

The Watts 4 inch Series 994RPDA Reduced Pressure Detector Assembly is a backflow preventer engineered for health hazard applications, preventing contaminants from entering the potable water supply. Constructed with a durable 300 Series stainless steel body, it offers superior corrosion resistance and reduced weight for easier installation. This model includes a SentryPlus Alert® flood sensor on the relief valve to detect excessive water discharges, providing critical notification capabilities when paired with an add-on connection kit. A cubic foot per minute (CFM) meter is also integrated to monitor for leaks or unauthorized water use. This assembly is supplied without shutoff valves and features a compact design for smaller enclosures and easy maintenance. Item number F438054.

Help Me Connect

Connection and Setup Guidance

  • This assembly is designed with flanged connections in accordance with AWWA Class D.
  • An add-on sensor connection kit is required to activate the flood sensor's communication features. Without this kit, the flood sensor operates as a passive component.
  • A retrofit sensor connection kit is available for existing installations if needed.
  • The flood alert feature, once activated, is compatible with Building Management Systems (BMS) and cellular network communication.
  • Watts recommends installing a drain line and the required 994AGK-P air gap for proper drain line installation to manage discharge in the event of a flood.
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Additional Details

The 4 inch Watts Series 994RPDA Reduced Pressure Detector Assembly Backflow Preventer is designed for health hazard applications to prevent the reverse flow of liquids due to backpressure or backsiphonage into the potable water supply. This assembly includes a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve.

This compact modular design features a short lay length stainless steel body and is assembled without shutoff valves, facilitating easy maintenance with a single access cover for in-line repairs.

Features

  • Stainless steel construction provides long term corrosion resistance and maximum strength.
  • Stainless steel body is 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.
  • Thermoplastic and stainless steel check valves for trouble-free operation.
  • No special tools required for servicing.
  • Compact construction allows for smaller enclosures.
  • Stainless steel relief valve features a balanced rolling diaphragm to eliminate sliding seals and lower maintenance costs.
  • Detects underground leaks and unauthorized water use.
  • Cubic foot per minute (CFM) meter included.
  • Flood sensor on relief valve for flood detection.
  • Flood alert feature activated with add-on sensor connection kit, compatible with BMS and cellular network communication.

An add-on sensor connection kit is required to activate the flood sensor's communication features; without it, the sensor is passive. Watts is not responsible for alert failures due to connectivity issues, power outages, or improper installation.

Specifications

  • Nominal Pipe Size: 4 inch
  • Main Valve Body Material: 300 Series Stainless Steel
  • All Internal Metal Parts Material: 300 Series Stainless Steel
  • Check Assembly Material: Noryl®
  • Shutoff Valves: No Shutoff Valves (LF)
  • Meter Type: Cubic Feet Per Minute (CFM) Meter
  • Flood Sensor: Included, on relief valve
  • Temperature Range: 33°F – 110°F (0.5°C – 43°C) continuous
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Flange Dimension: In accordance with AWWA Class D

Certificates & Approvals

  • AWWA C511-92
  • CSA B64.5
  • ASSE 1047
  • FM Approved
  • UL Classified
  • C US

FAQs

What is the primary purpose of the Watts 4 inch 994RPDA backflow preventer?

Its primary purpose is to prevent the reverse flow of hazardous materials, such as glycerin wetting agents, foam agents, or stagnant water, from contaminating the potable water supply in health hazard applications.

Does this 994RPDA model include shutoff valves?

No, this specific model (LF option) is assembled and supplied without shutoff valves for particular application requirements.

How does the flood sensor feature work?

The flood sensor, equipped with SentryPlus Alert® technology, detects excessive water discharges from the relief valve. When activated with an add-on sensor connection kit, it relays a signal for notification of potential flooding to facility personnel.

What materials are used for the main components of this assembly?

The main valve body and all internal metal parts are constructed from 300 Series stainless steel for long-term corrosion resistance and strength. The check assembly uses Noryl®.

What are the maximum operating pressure and temperature range for this unit?

This backflow preventer has a maximum operating pressure of 175 psi (12.1 bar) and a continuous temperature range of 33°F to 110°F (0.5°C to 43°C).

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