6 994-DNRS

Item Number: 0439403
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$17,825.86
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 6 inch
  • Body Material: 300 Series Stainless Steel
  • Gate Valve Type: Domestic Non-Rising Stem (NRS)
  • Maximum Operating Pressure: 175 psi
  • Temperature Range: 33°F-110°F continuous
  • Features: Short Lay Length Design
  • Protection: Backsiphonage and Backpressure
  • Includes: Flood Detection Sensor

Description

The Watts 6 inch Reduced Pressure Zone (RPZ) backflow preventer prevents the reverse flow of hazardous materials into potable water supplies. This assembly protects against both backsiphonage and backpressure, making it ideal for continuous pressure piping applications and health hazard cross-connections. It features a corrosion-resistant 300 series stainless steel body, short lay length, and domestic non-rising stem (NRS) gate valves. The design includes a bottom-mounted relief valve with a flood detection sensor and torsion spring check valves for maximum flow. Approved by ASSE 1013, AWWA C511-92, CSA B64.5, UL Classified, and FM, it offers reliable protection with a maximum working pressure of 175 psi. Item number 0439403.

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Connections & Compatibility

This 6 inch Reduced Pressure Zone (RPZ) backflow preventer is designed for installation in continuous pressure piping applications. It is suitable for cross-connections identified as health hazards and at the service line entrance to prevent backsiphonage and backpressure of hazardous materials into the potable water supply. The assembly is equipped with flanged connections, manufactured in accordance with AWWA Class D standards.

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Additional Details

The Watts 6 inch reduced pressure zone assembly backflow preventer 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 continuous pressure piping applications and at cross-connections identified as health hazards.

Features

  • Compact modular design with short lay length for easy maintenance and retrofit.
  • Single access cover for in-line repairs.
  • 300 Series Stainless steel body for corrosion resistance.
  • Bottom mounted relief valve reduces clearance requirements.
  • Patented torsion spring check valves provide maximum flow at low pressure drop.
  • Thermoplastic check valves with stainless steel hinge pins for trouble-free operation.
  • No special tools required for servicing.
  • Includes a sensor on the relief valve for flood detection.
  • Domestic non-rising stem resilient seated gate valves.
  • Includes four ball-type test cocks.

Watts recommends installing a drain line and the required 994AGK-P air gap for the drain line installation. When installing an air gap, attach the air gap brackets directly onto the flood sensor. Refer to product installation instructions and safety information before beginning installation.

The information provided is not intended to replace full product installation and safety information or the experience of a trained product installer. Always refer to product installation instructions and safety information before beginning the installation.

Specifications

  • Size: 6 inch
  • Body Material: 300 Series Stainless Steel
  • Internal Metal Parts: 300 Series Stainless Steel
  • Check Assembly Material: Noryl®
  • Gate Valve Type: Domestic Non-Rising Stem (NRS)
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Temperature Range: 33°F-110°F (0.5°C - 43°C) continuous
  • Lay Length (C-NRS): 16 inches (406 mm)
  • Overall Length (A): 48.5 inches (1232 mm)
  • Weight (with gates): 380 lbs (172 kg)
  • Relief Valve: Bottom Mounted, Resilient Seated
  • Check Valves: Thermoplastic, Torsion Spring
  • Flood Detection: Sensor on Relief Valve

Certificates & Approvals

  • ASSE: 1013
  • AWWA: C511-92
  • CSA: B64.5
  • UL Classified
  • FM Approved
  • Foundation for Cross Connection Control & Hydraulic Research Approved (2.5" to 6" sizes)

FAQs

What is the primary function of this Watts 994 Reduced Pressure Zone assembly?

Its primary function is to prevent backsiphonage and backpressure of hazardous materials or non-potable water from entering the potable water supply, protecting against contamination at cross-connections.

What type of gate valves does this 6-inch RPZ backflow preventer use?

This assembly is equipped with domestic non-rising stem (NRS) resilient seated gate valves, which offer reliable shutoff capabilities for isolation.

What materials are used for the main body and internal parts?

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

What is the maximum operating pressure and temperature range for this device?

This backflow preventer has a maximum operating pressure of 175 psi (12.1 bar) and can continuously operate in temperatures ranging from 33°F to 110°F (0.5°C to 43°C).

Does this backflow preventer include a flood detection sensor?

Yes, it includes a sensor located on the bottom-mounted relief valve for flood detection, providing an additional layer of safety and monitoring.

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