4 LF709-NRS-IOT

Item Number: 88003385
1 1
$10,550.98
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 4 Inch
  • Lead Free Construction: Wetted surface < 0.25% lead
  • Body Material: Epoxy Coated Cast Iron
  • Coating: ArmorTek® Powder Coating for corrosion resistance
  • Valve Type: NRS (Non-Rising Stem) Gate Valves
  • Integrated Pressure-Sensing Test Cocks (IoT)
  • Maximum Working Pressure: 175 PSI
  • Modular Design for Easy Maintenance

Description

The Watts 4 inch LF709-NRS-IOT Lead Free Double Check Valve Assembly is engineered to prevent backflow of polluted water into potable systems in non-health hazard installations. It features a robust epoxy coated cast iron body with patented ArmorTek® coating for superior corrosion resistance against MIC and exposed metal. Equipped with NRS shutoff valves and a modular check design for easy maintenance, this assembly also includes integrated pressure-sensing test cocks for proactive performance monitoring with an optional add-on kit. It operates up to 175 PSI and complies with Lead Free installation requirements. Item number 88003385.

Help Me Connect

Understanding Backflow Prevention

The Watts 4 inch Lead Free Double Check Valve Assembly is installed at cross-connections to prevent the backflow of polluted water into the potable water supply. It is specifically designed for installations where a non-health hazard situation exists, safeguarding the drinking water supply from contamination due to backsiphonage or backpressure.

Connections & Monitoring

  • This assembly features NRS (Non-Rising Stem) gate valves for shutoff on both sides, which are typically flange-connected into the main water line.
  • It includes integrated pressure-sensing test cocks (Model IOT) at three locations. These sensors monitor pressure fluctuations within the assembly.
  • To activate and transmit data from these sensors to a Building Management System (BMS) or Building Automation System (BAS), an add-on monitoring connection kit (available separately) is required. This kit communicates via a wired serial (RS-485) interface.
  • Consult local jurisdictional authority for specific installation requirements and approvals for use in your application.
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Additional Details

The Watts 4 inch LF709-NRS-IOT Lead Free Double Check Valve Assembly prevents the reverse flow of polluted water from entering the potable water system. This assembly is suitable for non-health hazard installations and continuous pressure piping applications, providing robust protection against backsiphonage and backpressure.

Construction & Design

  • Features a modular check design concept for simplified maintenance and assembly, retaining the spring load.
  • The body is constructed from fused epoxy coated cast iron, providing durability.
  • Utilizes NRS (Non-Rising Stem) resilient seated gate valves for shutoff.
  • Internal and external surfaces are coated with ArmorTek® powder coating, a patented three-part advanced epoxy system engineered to reduce microbial-induced corrosion (MIC) and protect exposed metal substrates.
  • Equipped with replaceable stainless steel seats.
  • Includes captured spring assemblies for enhanced safety during maintenance.
  • Approved for vertical flow up installation.

Integrated Monitoring Technology

  • Features integrated pressure-sensing test cocks (Model IOT) at three locations to measure pressure fluctuations.
  • These sensors are activated with an add-on monitoring connection kit (available separately) for collecting, converting, and transmitting data values for use in a building management system (BMS/BAS).
  • Enables monitoring and assessment of backflow assembly performance between code testing and helps drive maintenance scheduling.

NOTICE: Use of integrated pressure sensors and monitoring connection kits does not replace the need to comply with all required instructions, codes, and regulations related to installation, operation, and maintenance of the backflow preventer. Always read all installation instructions and safety information before beginning the installation of this product.

Specifications

  • Product Type: Double Check Valve Assembly
  • Size: 4 inch
  • Model: LF709-NRS-IOT
  • Body Material: Epoxy Coated Cast Iron
  • Valve Type: NRS (Non-Rising Stem) Gate Valves
  • Seats: Stainless Steel
  • Coating: ArmorTek® Powder Coating (Internal & External Surfaces)
  • Maximum Working Pressure: 175 PSI (12.1 bar)
  • Temperature Range (Continuous): 33°F - 110°F (0.5°C - 43°C)
  • Temperature Range (Intermittent): 140°F (60°C)
  • Lead Free Compliance: Wetted surface contains less than 0.25% lead by weight
  • Design: Modular check with center stem guiding
  • Features: Integrated pressure-sensing test cocks

Certificates & Approvals

  • ASSE No. 1015
  • AWWA C510-92
  • CSA B64.5
  • UL Classified File No. EX3185
  • IAPMO PA 31
  • NSF Certified to NSF/ANSI 61-G
  • Approved by Foundation for Cross-Connection Control and Hydraulic Research at USC
  • USC Manual for Cross-Connection Control, 8th Edition

FAQs

What is the primary function of the Watts LF709-NRS-IOT Double Check Valve Assembly?

This 4 inch double check valve assembly is designed to prevent the reverse flow of polluted (non-potable) water from entering the clean potable water supply, protecting against backsiphonage and backpressure in non-health hazard cross-connections.

What does 'Lead Free' mean for this specific product?

Lead Free means that the wetted surfaces of this product that come into contact with consumable water contain less than 0.25% lead by weight, ensuring compliance with current lead-free installation requirements.

How does the ArmorTek® coating benefit the valve's durability?

The ArmorTek® powder coating is a patented three-part advanced epoxy system applied to both internal and external surfaces. It is specifically engineered to reduce microbial-induced corrosion (MIC) and protect against exposed metal substrate corrosion, extending the valve's lifespan.

What is the purpose of the integrated pressure-sensing test cocks?

The integrated pressure-sensing test cocks on Model IOT measure pressure fluctuations at three points. When activated with an add-on monitoring connection kit (sold separately), they can transmit data to a building management system for proactive monitoring of the assembly's performance and to help schedule maintenance.

What are the maintenance benefits of this valve's design?

This assembly features a simplified modular check design concept that allows for complete maintenance and assembly while retaining the spring load. Captured spring assemblies and the ability to service without special tools further simplify maintenance.