4 994RPDA-LF-GPM

Item Number: 0438055
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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 Size: 4 inch
  • Weight: 95.0 lb
  • Product Type: Reduced Pressure Detector Assembly
  • Shutoff Valves: Not included (LF model)
  • Metering: Gallons Per Minute (GPM) meter
  • Flood Detection: Sensor on relief valve for flood detection
  • Body Material: 300 Series Stainless Steel
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Easy Installation: Half the weight of competitive designs and short lay length

Description

This 4 inch Reduced Pressure Detector Assembly prevents the reverse flow of fire protection substances and non-potable water into potable water supplies. Designed without shutoff valves, this backflow preventer protects against backsiphonage and backpressure in health hazard applications and continuous pressure piping. Its stainless steel body offers superior corrosion resistance and strength while being half the weight of competitive designs, simplifying installation. Features include a compact, modular design for easy maintenance, a short lay length, and a bottom-mounted relief valve for reduced clearance. A Gallons Per Minute (GPM) meter detects leaks, and an integrated flood sensor (requires an activation kit) monitors discharges. Max operating pressure is 175 psi, with a continuous temperature range of 33-110°F.

Help Me Connect

This 4 inch Reduced Pressure Detector Assembly is designed for installation in continuous pressure piping applications. It typically connects using flanged connections, with flange dimensions in accordance with AWWA Class D standards.

It is used to protect potable water supplies from backsiphonage and backpressure of non-potable substances found at cross-connections or service line entrances.

  • To activate the integral flood sensor, an add-on connection kit (sold separately) is required.
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Additional Details

This 4 inch reduced pressure detector backflow preventer, assembled without shutoff valves, is designed to prevent the reverse flow of fire protection substances and non-potable water into the potable water supply. It protects against backsiphonage and backpressure in accordance with national plumbing codes and water authority requirements.

This assembly features a compact modular design for easy maintenance with a single access cover, making it ideal for continuous pressure piping applications and cross-connections identified as health hazards.

Construction & Design

  • Stainless steel body for long term corrosion resistance and maximum strength
  • Half the weight of competitive designs, reducing installation and shipping costs
  • Short end-to-end dimensions for easy retrofit
  • 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 with stainless steel hinge pins for trouble-free operation
  • Stainless steel relief valve features a balanced rolling diaphragm to eliminate sliding seals and lower maintenance costs
  • Compact construction allows for smaller enclosures

Monitoring & Detection

  • Detects underground leaks and unauthorized water use
  • Furnished with a Gallons Per Minute (GPM) meter
  • Includes a sensor on the relief valve for flood detection to trigger alerts when activated by an add-on connection kit.

An add-on connection kit is required to activate the flood sensor; without this kit, the sensor is a passive component and does not communicate with other devices.

Specifications

General

  • Model Series: 994RPDA
  • Nominal Size: 4 inch
  • Shutoff Valves: No
  • Meter Type: Gallons Per Minute (GPM)

Materials

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

Performance

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

Certificates & Approvals

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

Dimensions & Weight (Without Shutoff Valves)

  • Overall Length (A): 40 in (1016 mm)
  • Main Body Length (L): 22 in (559 mm)
  • Height (G): 10 in (254 mm)
  • Depth (D): 10.5 in (267 mm)
  • Height to Top of Main Valve Body (C): 22.75 in (578 mm)
  • Weight: 67 lbs (30 kg)

FAQs

What is the primary purpose of the 4 inch 994RPDA Reduced Pressure Detector Assembly?

Its primary purpose is to prevent the reverse flow of fire protection substances and non-potable water into the potable water supply. It protects against backsiphonage and backpressure in accordance with national plumbing codes.

Does this specific model include shutoff valves?

No, this 994RPDA-LF-GPM model is assembled without shutoff valves, as indicated by the "LF" designation.

What are the main construction materials for this backflow preventer?

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

How does the flood sensor feature work on this assembly?

The assembly includes a sensor on the relief valve for flood detection. To activate this feature and enable communication for alerts, an add-on sensor connection kit is required and sold separately.

What is the maximum operating pressure and continuous temperature range for this backflow preventer?

This assembly is rated for a maximum working pressure of 175 psi (12.1 bar). It can operate continuously within a temperature range of 33°F to 110°F (0.5°C to 43°C).

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