2 1/2 LF856-DOSY-GPM

Item Number: 0124433
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$9,077.40
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Febco
  • Size: 2 1/2 inch
  • Weight: 202.0 lb
  • Lead Free Construction: Less than 0.25% lead by weight
  • Maximum Working Pressure: 175 psi
  • Body Material: Ductile Iron Grade 65-45-12
  • Coating: ArmorTek advanced epoxy system
  • Shutoff Valves: OS&Y resilient wedge gate valves
  • Bypass Water Meter: 5/8 inch x 3/4 inch GPM
  • Approvals: ASSE 1048 Listed, UL Classified, FM Approved

Description

The 2 1/2 inch FEBCO MasterSeries LF856 Lead Free Double Check Detector Backflow Preventer Assembly is designed for non-health hazard applications, primarily in fire sprinkler and standpipe systems. It protects drinking water supplies from backsiphonage and backpressure of pollutants. Constructed with a durable ductile iron body and ArmorTek epoxy coating, it offers enhanced corrosion resistance. Key features include a GPM metered bypass for leak detection, two independent check valves with stainless steel components, and OS&Y gate valves. This lead-free assembly (less than 0.25% lead by weight) is ASSE 1048, UL Classified, and FM Approved, with a maximum working pressure of 175 psi.

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Installation & Connections

  • This MasterSeries LF856 Double Check Detector Assembly should be installed on the potable water supply at each point of cross-connection.
  • It is designed for non-health hazard (pollutant) applications.
  • The assembly is fitted with UL Classified/FM Approved inlet/outlet resilient seated shutoff valves and resilient seated test cocks.
  • End connections are compliant to ASME B16.1 Class 125 and AWWA Class D Flange.
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Additional Details

The 2 1/2 inch FEBCO MasterSeries LF856 Lead Free Double Check Detector Backflow Preventer Assembly (Type II) is designed to protect drinking water supplies from cross-connections.

It prevents the backflow of pollutants due to backsiphonage or backpressure that are objectionable, but not toxic, from entering potable water systems, making it ideal for non-health hazard applications such as fire sprinkler and standpipe systems, or for containment at the service line entrance to detect unauthorized water usage.

Construction & Design

  • Features a ductile iron body construction with a patented 3-part advanced ArmorTek epoxy coating system to resist microbial-induced corrosion (MIC) and protect exposed metal substrates.
  • Consists of two (2) independently acting clapper style check modules with replaceable seats and disc rubbers.
  • Includes UL Classified/FM Approved inlet/outlet resilient seated shutoff valves and four (4) resilient seated test cocks.
  • The auxiliary bypass line contains a 5/8 inch x 3/4 inch water meter that complies with ANSI/AWWA Standard C700 and an approved check assembly to detect leaks or unauthorized water usage.

Main Valve Features

  • In-line serviceable assembly with no special tools required for servicing.
  • Captured modular spring assembly.
  • Reversible and replaceable discs and field replaceable seats.
  • Stainless steel check components.
  • Winterization feature with disc retainers and valve body drain ports.
  • Clapper check assembly with commonality between 1st and 2nd check components.
  • Captured O-ring design.

Auxiliary Bypass Features

  • Compact bypass design that remains in the main valve assembly profile.
  • In-line serviceable 3/4 inch check assembly with no special tools required for servicing.
  • Field replaceable seat and disc.
  • Designed to detect potential underground water leaks and unauthorized water usage.
NOTICE: The information contained herein is not intended to replace the full product installation and safety information available or the experience of a trained product installer. You are required to thoroughly read all installation instructions and product safety information before beginning the installation of this product.

Specifications

General

  • Product Type: Double Check Detector Backflow Preventer Assembly
  • Model: LF856 (Type II)
  • Size: 2 1/2 inch
  • Lead Content: Less than 0.25% by weight
  • Application: Non-health hazard, non-potable service (irrigation, fire line, industrial processing)
  • Primary Use: Fire sprinkler and standpipe systems

Materials

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

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 Water Meter: 5/8 inch x 3/4 inch 16 mm x 19 mm
  • Bypass Meter Standard: ANSI/AWWA C700 Compliant
  • Performance Standard: AWWA Standard C510 Compliant

Dimensions & Weight (2 1/2" with OSY Gate Valves)

  • Overall Length (A): 40 3/4 inches (1035 mm)
  • Length of Check Assembly (B): 25 1/2 inches (648 mm)
  • Centerline to Centerline (C): 10 inches (254 mm)
  • Height (E): 16 3/8 inches (416 mm)
  • Width (F): 4 1/2 inches (114 mm)
  • Test Cock Length (G): 7 1/8 inches (181 mm)
  • Test Cock Height (H): 13 3/8 inches (340 mm)
  • Weight: 245 lbs (111 kg)

Certificates & Approvals

  • 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 application of the FEBCO LF856 Double Check Detector Assembly?

The FEBCO LF856 assembly is primarily used for protecting drinking water supplies from non-health hazard cross-connections, such as those found in fire sprinkler and standpipe systems, or for industrial processing and irrigation.

What does "Lead Free" mean for this backflow preventer?

Lead Free means that the wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight, meeting national plumbing codes for drinking water safety.

What is ArmorTek coating and what are its benefits?

ArmorTek is a patented three-part advanced epoxy system applied to the iron components. It is engineered to reduce microbial-induced corrosion (MIC) and protect exposed metal substrates from electrochemical corrosion, extending the product's lifespan.

Can this assembly detect water leaks or unauthorized usage?

Yes, the auxiliary bypass line includes a 5/8 inch x 3/4 inch water meter (ANSI/AWWA Standard C700 compliant) and is specifically designed to detect potential underground water leaks or unauthorized water usage within the system.

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

The maximum working pressure for this assembly is 175 psi (12.1 bar). It has a continuous operating temperature range of 33°F to 140°F (0.5°C to 60°C).

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