4 LF856-DOSY-GPM

Item Number: 0124443
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$10,725.10
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Febco
  • Size: 4 inch
  • Weight: 307.0 lb
  • Lead Free Construction: Yes (less than 0.25% lead by weight)
  • Maximum Working Pressure: 175 psi
  • Main Valve Body Material: Ductile iron Grade 65-45-12
  • Internal & External Coating: ArmorTek advanced epoxy system
  • Shutoff Valves: OS&Y resilient wedge gate valves
  • Auxiliary Bypass: Features GPM meter for leak detection
  • Certifications: ASSE 1048, UL Classified, FM Approved

Description

This 4 inch FEBCO MasterSeries LF856 Double Check Detector Backflow Preventer is a lead-free assembly designed to protect potable water supplies from non-health hazard pollutants. It prevents backflow due to backsiphonage and backpressure, making it suitable for fire sprinkler and standpipe systems that require detection of unauthorized water usage. Constructed with a durable ductile iron body, it features ArmorTek® epoxy coating for advanced corrosion resistance, including microbial-induced corrosion. The assembly includes OS&Y gate valves, stainless steel check components, and a GPM metered bypass for leak detection. It is UL Classified, FM Approved, and ASSE 1048 Listed.

Help Me Connect

The FEBCO MasterSeries® LF856 Double Check Detector Assembly is designed for installation on the potable water supply at any point of cross-connection. It provides protection against possible backpressure and backsiphonage conditions for non-health hazard (pollutant) applications. The end connections are compliant to ASME B16.1 Class 125 and AWWA Class D Flange standards, ensuring broad compatibility with standard piping systems.

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Additional Details

This 4 inch lead free MasterSeries® LF856 Double Check Detector Backflow Preventer Assembly is designed to protect drinking water supplies from dangerous cross-connections. It prevents the backflow of pollutants due to backsiphonage and/or backpressure conditions, making it ideal for non-health hazard applications such as fire sprinkler and standpipe systems where detection of unauthorized water use is required.

The assembly incorporates ArmorTek® coating technology, a patented three-part advanced epoxy system engineered to reduce microbial-induced corrosion (MIC) and protect exposed metal substrate.

Main Valve Features

  • In-line serviceable assembly requiring no special tools for servicing
  • Captured modular spring assembly
  • Reversible and replaceable discs
  • Field replaceable seats
  • Ductile iron valve body design
  • Stainless steel check components
  • ArmorTek coating technology to resist corrosion of internals
  • Winterization feature with disc retainers and valve body drain ports
  • Clapper check assembly
  • Commonality between 1st and 2nd check components
  • Captured O-ring design

Auxiliary Bypass Features

  • Compact bypass design, remains in main valve assembly profile
  • In-line serviceable 3/4" check assembly requiring no special tools for servicing
  • Field replaceable seat and disc
  • Designed to detect potential underground water leaks
  • Designed to detect unauthorized water usage
  • Equipped with a GPM meter

Specifications

  • Size: 4 inch
  • Lead Free: Yes (less than 0.25% lead by weight)
  • Model: LF856
  • Bypass Meter: 5/8" x 3/4" GPM Water Meter (ANSI/AWWA C700 Compliant)

Materials

  • Main Valve Body: Ductile iron Grade 65-45-12
  • Coating: ArmorTek powder coating
  • Shutoff Valves: OS&Y resilient wedge gate valves AWWA C515
  • Check Seats: Stainless steel
  • Disc Holder: Stainless steel
  • Elastomer Disc: Silicone
  • Spring: Stainless steel

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

Certificates & Approvals

  • Foundation for Cross-Connection Control and Hydraulic Research (FCCCHR-USC)
  • ASSE 1048 Listed
  • UL Classified (U.S. & Canada)
  • FM Approved
  • IAPMO
  • AWWA Standard C510 Compliant
  • End Connections: Compliant to ASME B16.1 Class 125 & AWWA Class D Flange

FAQs

What is the primary use of the FEBCO LF856 Double Check Detector Assembly?

This assembly is primarily used to protect drinking water supplies from non-health hazard pollutants, preventing backflow due to backsiphonage and backpressure. It is ideal for fire sprinkler and standpipe systems where detection of unauthorized water use is required.

Is this backflow preventer assembly lead-free?

Yes, the FEBCO MasterSeries LF856 Double Check Detector Assembly is lead-free. The wetted surfaces contain less than 0.25% lead by weight, meeting current lead-free standards.

What is ArmorTek® coating technology?

ArmorTek® is a patented three-part advanced epoxy coating system applied to the iron components of the backflow preventer. It is engineered to reduce microbial-induced corrosion (MIC) and protect exposed metal substrates, enhancing durability and longevity.

What type of shutoff valves are included with this assembly?

This assembly includes OS&Y (Outside Stem and Yoke) resilient wedge gate shutoff valves. These valves are UL Classified/FM Approved and comply with AWWA C510 standards.

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

The maximum working pressure for the FEBCO LF856 is 175 psi (12.1 bar). It operates continuously within a temperature range of 33°F to 140°F (0.5°C to 60°C).

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