8 LF856-DOSY-GPM

Item Number: 0124455
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$33,133.32
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Febco
  • Size: 8 inch
  • Weight: 815.0 lb
  • Body Material: Ductile Iron
  • Coating: ArmorTek® Epoxy
  • Max Working Pressure: 175 psi
  • Lead Free Construction: < 0.25% lead
  • Shutoff Valves: OS&Y Gate Valves
  • Bypass Meter: GPM (Gallons Per Minute)
  • Approvals: ASSE 1048, UL Classified, FM Approved

Description

This 8 inch FEBCO MasterSeries LF856 Double Check Detector Backflow Preventer Assembly protects potable water supplies from non-health hazard cross-connections. It prevents backflow from backpressure or backsiphonage, making it ideal for fire sprinkler and standpipe systems requiring detection of unauthorized water use. The assembly features a durable ductile iron body with ArmorTek® epoxy coating for corrosion resistance, two independent check valves, and OS&Y gate valve shutoffs. It includes a GPM metered bypass for leak detection and water usage monitoring. This lead-free unit is rated for 175 psi maximum working pressure and approved by ASSE, UL, and FM. Item number 0124455.

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Installation & Connections

This 8 inch Lead Free Double Check Detector Backflow Preventer Assembly is designed for installation on potable water supply lines at points of cross-connection. It protects against backpressure and backsiphonage in non-health hazard (pollutant) applications.

  • End Connections: Compliant to ASME B16.1 Class 125 and AWWA Class D Flange standards.
  • Ensure proper sizing and orientation (Horizontal & Vertical Up approved) for your system.
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Additional Details

This 8 inch lead free MasterSeries® LF856 Double Check Detector Backflow Preventer Assembly protects drinking water supplies from non-health hazard pollutants due to backpressure or backsiphonage. It is primarily used for the protection of non-health hazard cross-connections and for containment at the service line entrance, commonly found in fire sprinkler and standpipe systems that require detection of unauthorized water use.

The assembly consists of a durable ductile iron body, two in-line independent check valves, replaceable stainless steel check seats, and outside stem and yoke (OS&Y) resilient seated domestic gate valve shutoff valves. It also includes a gallons per minute (GPM) metered bypass and ball valve test cocks. The iron components are coated with ArmorTek®, a patented three-part advanced epoxy system, engineered to reduce microbial-induced corrosion (MIC) and protect exposed metal substrates.

Main Valve Features

  • In-line serviceable assembly
  • No special tools required 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
  • No special tools required for servicing
  • Field replaceable seat and disc
  • Detect potential underground water leaks
  • Detect unauthorized water usage

The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.

Specifications

  • Product Type: Double Check Detector Backflow Preventer Assembly (Type II)
  • Size: 8 inch
  • Body Material: Ductile Iron Grade 65-45-12
  • Coating: ArmorTek® Powder Coating (internal and external surfaces)
  • Shutoff Valves: OS&Y Resilient Wedge Gate Valves AWWA C515 (UL Classified/FM Approved)
  • Check Seats: Stainless Steel
  • Disc Holder: Stainless Steel
  • Elastomer Disc: Silicone
  • Spring: Stainless Steel
  • Lead Content: Less than 0.25% by weight (wetted surface)

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
  • Bypass Meter: 5/8" x 3/4" Water Meter (ANSI/AWWA C700 Compliant)
  • Bypass Meter Type: Gallons Per Minute (GPM)

Dimensions & Weight (for 8 inch)

  • A Dimension: 65 in (1651 mm)
  • B Dimension: 41 3/4 in (1061 mm)
  • C Dimension: 15 5/8 in (397 mm)
  • E Dimension (with OSY): 37 3/4 in (959 mm)
  • F Dimension: 7 in (178 mm)
  • G Dimension: 11 1/8 in (283 mm)
  • H Dimension: 15 3/4 in (400 mm)
  • Weight (with OSY Gate Valves): 826 lbs (375 kg)

Certificates & Approvals

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

FAQs

What is the primary application of this backflow preventer?

This backflow preventer is primarily used for non-health hazard cross-connections, such as fire sprinkler and standpipe systems, to prevent backflow of pollutants into the potable water supply. It also detects unauthorized water usage.

What type of coating is used on the backflow preventer, and what are its benefits?

The backflow preventer features ArmorTek®, a patented three-part advanced epoxy coating system. This coating is engineered to reduce microbial-induced corrosion (MIC) and protect exposed metal substrates.

Is this product suitable for potable water systems?

Yes, this assembly is designed to protect drinking water supplies by preventing non-health hazard pollutants from entering the potable water system through cross-connections. Its wetted surfaces contain less than 0.25% lead by weight, making it lead-free.

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

The maximum working pressure for this 8 inch assembly 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).

What type of shutoff valves are included with this assembly?

This assembly comes with UL Classified/FM Approved OS&Y (Outside Stem and Yoke) resilient seated domestic gate valves, compliant with AWWA C515.

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