3 LF856-DOSY-GPM

Item Number: 0124438
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$10,391.55
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Febco
  • Nominal Size: 3 inch
  • Weight: 228.0 lb
  • Lead Free Construction: <0.25% lead by weight
  • Max Working Pressure: 175 psi
  • Temperature Range: 33°F - 140°F (Continuous)
  • Body Material: Ductile Iron Grade 65-45-12
  • Coating: ArmorTek Powder Coating for corrosion resistance
  • Shutoff Valves: OS&Y Resilient Wedge Gate Valves
  • Auxiliary Bypass: GPM Meter for leak detection

Description

The 3 inch FEBCO MasterSeries LF856 is a lead free double check detector backflow preventer assembly for potable water systems. It is designed to prevent the backflow of non-health hazard pollutants caused by backsiphonage or backpressure. This assembly features a durable ductile iron body with ArmorTek® powder coating for corrosion resistance, OS&Y gate valves, and an auxiliary bypass with a GPM meter for detecting leaks and unauthorized water usage. It is suitable for non-health hazard cross-connections, service line containment, and fire sprinkler/standpipe systems. The unit has a maximum working pressure of 175 psi and operates in temperatures from 33°F to 140°F.

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Installation & Use

  • This 3 inch Double Check Detector Backflow Preventer Assembly is designed for installation on the potable water supply.
  • It is used at points of cross-connection to protect against backpressure and backsiphonage conditions for non-health hazard (pollutant) applications.
  • Ideal for containment at the service line entrance or for use on fire sprinkler and standpipe systems requiring detection of unauthorized water use.
  • End connections are compliant to ASME B16.1 Class 125 and AWWA Class D Flange standards.
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Additional Details

The FEBCO MasterSeries LF856 3 inch lead free double check detector backflow preventer assembly is designed to protect potable water supplies from the backflow of pollutants due to backsiphonage or backpressure. It is ideal for non-health hazard cross-connections, containment at the service line entrance, and is primarily used on fire sprinkler and standpipe systems where detection of unauthorized water use is required.

This assembly features a ductile iron body with ArmorTek® coating technology, domestic OSY gate valve shutoff valves, and a detector bypass assembly with a Gallons Per Minute (GPM) meter.

Main Valve Features

  • In-line serviceable assembly with no special tools required for servicing
  • Captured modular spring assembly and captured O-ring design
  • Reversible and replaceable discs and field replaceable seats
  • Ductile iron valve body design with 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 with commonality between 1st and 2nd check components

Auxiliary Bypass Features

  • Compact bypass design; remains in main valve assembly profile
  • In-line serviceable 3/4 inch check assembly
  • No special tools required for servicing
  • Field replaceable seat and disc
  • Detect potential underground water leaks
  • Detect unauthorized water usage

Specifications

General

  • Product Type: Double Check Detector Backflow Preventer Assembly
  • Nominal Size: 3 inch
  • Lead Free: Yes (wetted surface contains less than 0.25% lead by weight)
  • Flow Orientation: Horizontal and Vertical Up

Materials

  • Main Valve Body: Ductile Iron Grade 65-45-12
  • Coating: ArmorTek Powder Coating (internal and external surfaces)
  • Shutoff Valves: OS&Y Resilient Wedge Gate Valves (UL Classified/FM Approved, AWWA C515)
  • Check Seats: Stainless Steel
  • Disc Holder: Stainless Steel
  • Elastomer Disc: Silicone
  • Spring: Stainless Steel

Performance

  • 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 & Weight (with OSY Gate Valves)

  • Overall Length (A): 41 7/8 inches (1064 mm)
  • Width (B): 25 5/8 inches (651 mm)
  • Bypass (C): 10 inches (254 mm)
  • Height (E**): 22 1/7 inches (565 mm)
  • Inlet/Outlet Depth (F): 4 1/2 inches (114 mm)
  • Check Module Depth (G): 7 3/8 inches (187 mm)
  • Test Cock Height (H): 13 3/8 inches (340 mm)
  • Weight: 271 lbs (123 kg)

Certificates & Approvals

  • Approved by Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California (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 MasterSeries LF856 assembly?

It is designed to protect potable water supplies from non-health hazard pollutants due to backsiphonage or backpressure. It is commonly used for non-health hazard cross-connections, containment at the service line, and on fire sprinkler/standpipe systems to detect unauthorized water use.

What type of coating is used on this backflow preventer?

The assembly features ArmorTek® powder coating, a patented three-part advanced epoxy system, applied to both internal and external surfaces. This coating is engineered to reduce microbial-induced corrosion (MIC) and protect exposed metal substrates.

What are the key features of the auxiliary bypass on this unit?

The auxiliary bypass has a compact design that includes an in-line serviceable 3/4 inch check assembly, field replaceable seat and disc, and a GPM meter. This bypass is designed to detect potential underground water leaks and unauthorized water usage.

What are the pressure and temperature ratings for the 3 inch LF856 assembly?

The maximum working pressure is 175 psi (12.1 bar). It has a hydrostatic test pressure of 350 psi and a hydrostatic safety pressure of 700 psi. The continuous operating temperature range is 33°F to 140°F (0.5°C to 60°C).

Is this backflow preventer assembly lead-free?

Yes, the FEBCO MasterSeries LF856 is lead-free. The wetted surface of this product that contacts consumable water contains less than 0.25% of lead by weight.

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