4 LF709-NRS-S-FDA-IOT

Item Number: 88003391
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$12,479.26
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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
  • Product Type: Double Check Valve Backflow Preventer Assembly
  • Lead Free: Wetted surface contains less than 0.25% lead
  • Body Material: Fused Epoxy Coated Cast Iron
  • Corrosion Resistance: ArmorTek® 3-part advanced epoxy coating
  • Valves: Non-Rising Stem (NRS) Resilient Seated Gate Valves
  • Features: Integrated pressure-sensing test cocks
  • Max Working Pressure: 175 psi

Description

This 4 inch Lead Free Double Check Valve Backflow Preventer Assembly, Model LF709-NRS-S-FDA-IOT, prevents the reverse flow of polluted water into potable systems. It is suitable for non-health hazard installations and continuous pressure piping applications. Constructed with a fused epoxy coated cast iron body and ArmorTek coating for superior corrosion resistance, it features NRS resilient seated gate valves and an FDA epoxy coated strainer. Integrated pressure-sensing test cocks allow performance monitoring with an add-on kit. The assembly operates up to 175 psi and meets ASSE 1015, AWWA C510-92, and CSA B64.5 standards.

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Installation & Compatibility

  • This 4 inch double check valve backflow preventer is designed for installation in continuous pressure piping applications and cross-connections identified as non-health hazards.
  • It is suitable for preventing the reverse flow of non-potable quality water into the potable water supply.
  • The assembly is approved for vertical flow up installation.
  • The integrated pressure-sensing test cocks require an add-on monitoring connection kit (sold separately) to activate sensors and transmit data. This kit communicates via a wired serial (RS-485) interface and is compatible with most Building Management and Building Automation Systems (BMS/BAS).
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Additional Details

This 4 inch lead free double check valve backflow preventer assembly is designed to prevent the reverse flow of polluted or contaminated water from entering the potable water supply. It is ideal for protection in continuous pressure piping applications and cross-connections identified as non-health hazards, where approved by the local authority having jurisdiction.

Key Features

  • Features a modular check design concept to facilitate complete maintenance and assembly, retaining the spring load for safety.
  • Constructed with a fused epoxy coated cast iron body and NRS resilient seated gate valves.
  • Includes an FDA epoxy coated strainer for added protection.
  • Utilizes ArmorTek® coating technology, a patented three-part advanced epoxy system, engineered to reduce microbial-induced corrosion (MIC) and protect exposed metal substrate.
  • Contains replaceable stainless steel seats, and requires no special tools for servicing.
  • Designed for maximum flow at low pressure drop.
  • Approved for vertical flow up installation.
  • Complies with Lead Free* construction requirements (wetted surfaces contain less than 0.25% lead by weight).

Smart & Connected Technology

  • Equipped with integrated pressure-sensing test cocks (No. 2, No. 3, and No. 4) that measure pressure fluctuations at three locations.
  • Enables monitoring and assessment of certain aspects of backflow assembly performance and the water supply system.
  • Requires an add-on monitoring connection kit (sold separately) to activate sensors, collect, convert, and transmit data values via a wired serial (RS-485) interface.
  • The connection kit is compatible with most Building Management and Building Automation Systems (BMS/BAS).

Use of integrated pressure sensors and the monitoring connection kit with IOT models does not replace the need to comply with all required instructions, codes, and regulations related to installation, operation, and maintenance of the backflow preventer. You are required to thoroughly read all installation instructions and product safety information before beginning the installation of this product.

Specifications

  • Size: 4 inch
  • Product Type: Double Check Valve Backflow Preventer Assembly
  • Body Material: Fused Epoxy Coated Cast Iron
  • Coating: ArmorTek® 3-part Advanced Epoxy System
  • Valve Type: Non-Rising Stem (NRS) Resilient Seated Gate Valves
  • Strainer: FDA Epoxy Coated
  • Seats: Replaceable Stainless Steel
  • Lead Content: Less than 0.25% by weight (wetted surface)
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Temperature Range: 33°F - 110°F (0.5°C - 43°C) continuous, 140°F (60°C) intermittent

Certificates & Approvals

  • ASSE No.: 1015
  • AWWA Standard: C510-92
  • CSA Standard: B64.5
  • UL Classification: File No. EX3185
  • NSF Certification: NSF/ANSI 61-G
  • IAPMO Approval: PA 31
  • Approved by: Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California
  • Manual Reference: USC Manual for Cross-Connection Control, 8th Edition

FAQs

What is the primary function of the 4 inch LF709-NRS-S-FDA-IOT backflow preventer?

This backflow preventer is designed to prevent the reverse flow of polluted or contaminated water from entering the potable water supply. It is used in continuous pressure piping applications and non-health hazard cross-connections.

What does 'Lead Free' mean for this product?

The 'Lead Free' designation means that the wetted surface of this product, which comes into contact with consumable water, contains less than 0.25% lead by weight. This complies with Lead Free installation requirements.

How does the ArmorTek® coating benefit this backflow preventer?

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

How do the integrated pressure sensors work, and what is needed to use them?

The assembly features integrated pressure-sensing test cocks at three locations (No. 2, No. 3, and No. 4) to measure pressure fluctuations. To collect and transmit this data for monitoring, an add-on monitoring connection kit (sold separately) is required. This kit enables communication with Building Management Systems (BMS/BAS) via a wired serial (RS-485) interface.

What are the key standards and approvals this backflow preventer meets?

This 4 inch LF709 backflow preventer meets ASSE No. 1015, AWWA C510-92, CSA B64.5, UL Classified File No. EX3185, and NSF/ANSI 61-G. It is also approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California.

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