4 LF850-DNRS

Item Number: 0683082
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$7,899.93
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Febco
  • Product Type: Double Check Valve Assembly
  • Weight: 425.0 lb
  • Size: 4 Inch
  • Shutoff Valves: Domestic Non-Rising Stem (NRS)
  • Body Material: Ductile Iron Grade 65-45-12
  • ArmorTek Powder Coating for corrosion resistance
  • Maximum Working Pressure: 175 PSI
  • Lead Free: Yes (Wetted surface < 0.25% lead)
  • ASSE 1015 Listed, CSA B64.5

Description

The FEBCO 4 Inch Lead Free MasterSeries LF850 Double Check Valve Assembly with domestic NRS shutoffs is designed for non-health hazard (pollutant) backflow prevention in potable water systems. Its fused epoxy ductile iron body is protected by ArmorTek® coating for superior corrosion resistance, including microbial-induced corrosion (MIC). This assembly prevents backsiphonage and backpressure, ensuring compliance with local codes. Featuring in-line serviceability, replaceable check components, and a compact modular design, it offers easy maintenance. Rated for a maximum working pressure of 175 PSI and temperature range of 33°F to 140°F. ASSE 1015 Listed and CSA B64.5 compliant. Item number 0683082.

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Connections and Compatibility

This 4 inch FEBCO LF850 backflow preventer assembly is designed for installation on potable water supply systems. It features end connections compliant to ASME B16.1 Class 125 and AWWA Class D Flange standards, ensuring compatibility with standard flanged piping systems. The assembly includes domestic non-rising stem (NRS) resilient seated gate valves for secure shut-off.

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Additional Details

This 4 inch lead free MasterSeries® double check valve backflow preventer assembly is designed to prevent the backflow of polluted water from entering into the potable water supply due to backsiphonage and/or backpressure conditions. It is ideal for protection in continuous pressure piping applications and at cross-connections identified as non-health hazards.

Construction and Design

  • This assembly features a fused epoxy ductile iron body with a patented ArmorTek® 3-part advanced epoxy coating system, engineered to reduce microbial-induced corrosion (MIC) and protect exposed metal substrate.
  • Includes domestic non-rising stem (NRS) resilient seated gate valves, top-mounted test cocks, and two in-line independent positive seating check modules.
  • Designed for in-line serviceability with replaceable check discs and seats, requiring no special tools for servicing.
  • Features a compact modular design for easy maintenance and a winterization feature with disc retainers and valve body drain ports.
  • Lead Free* construction ensures compliance with low lead installation requirements.

Operation and Protection

  • Specifically designed for non-health hazard (pollutant) applications to protect potable drinking water systems.
  • Prevents backsiphonage and backpressure conditions as mandated by Local Governing Water Utility Code.
  • The assembly incorporates stainless steel check components and a captured modular spring assembly for reliable performance.

Installation requires thorough reading of all instructions and product safety information. Inquire with governing authorities for local installation requirements prior to beginning installation.

Specifications

General

  • Product Type: Double Check Valve Assembly
  • Size: 4 Inch
  • Shutoff Valves: Domestic Non-Rising Stem (NRS) Resilient Seated Gate Valves
  • Lead Free: Yes (Wetted surface contains less than 0.25% lead by weight)

Materials

  • Main Valve Body: Ductile Iron Grade 65-45-12
  • Coating: ArmorTek Powder Coating (Internal and External Surfaces)
  • Check Seats: Stainless Steel
  • Disc Holder: Stainless Steel
  • Elastomer Disc: Silicone
  • Spring: Stainless Steel
  • Clamp: AWWA C606 (Note: applies to 10" size)

Performance Ratings

  • Maximum Working Pressure: 175 PSI (12.1 bar)
  • Minimum Working Pressure: 10 PSI (0.7 bar)
  • Hydrostatic Test Pressure: 350 PSI (24.1 bar)
  • Hydrostatic Safety Pressure: 700 PSI (48.3 bar)
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C) Continuous

Dimensions (NRS)

  • Overall Length (A): 46 1/4 inch (1175 mm)
  • Length (B): 28 inch (711 mm)
  • Height (C): 10 1/8 inch (257 mm)
  • Shutoff Valve Length (D): 14 3/8 inch (365 mm)
  • Distance from Center to Top (E): 23 1/4 inch (591 mm)
  • Shutoff Valve Center to Flange (F): 5 1/2 inch (140 mm)
  • Shutoff Valve Top to Bottom (G): 8 1/8 inch (206 mm)

Weight (NRS)

  • Assembly Weight: 311 lb (141 kg)

Certificates & Approvals

  • Approved by: Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California (FCCCHR-USC)
  • ASSE: 1015 Listed
  • IAPMO: Approved
  • CSA: Listed, CSA B64.5
  • AWWA Standard: C510 Compliant
  • End Connections: Compliant to ASME B16.1 Class 125 & AWWA Class D Flange
  • NSF: Certified to NSF/ANSI 61-G

FAQs

What is the primary purpose of the FEBCO LF850 Double Check Valve Assembly?

The primary purpose is to prevent the backflow of polluted water from entering potable drinking water systems due to backsiphonage or backpressure, specifically for non-health hazard (pollutant) applications.

Is this backflow preventer assembly suitable for "Lead Free" installations?

Yes, it features Lead Free* construction, meaning the wetted surface of the product contacted by consumable water contains less than 0.25% of lead by weight, complying with low lead installation requirements.

What type of shutoff valves are included with this 4-inch LF850 assembly?

This assembly is equipped with domestic Non-Rising Stem (NRS) resilient seated gate valves, which comply with AWWA C509 standards.

How does the ArmorTek® coating benefit the valve assembly?

The ArmorTek® coating is a patented three-part advanced epoxy system applied to the ductile iron body. It is engineered to reduce microbial-induced corrosion (MIC) and protect exposed metal substrates from electrochemical corrosion.

What are the maximum operating pressure and temperature limits for this device?

The maximum working pressure for this assembly is 175 PSI (12.1 bar), and it can operate continuously within a temperature range of 33°F to 140°F (0.5°C to 60°C).

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