The Febco 4 inch LF850 MasterSeries Double Check Valve Assembly is a lead-free backflow preventer designed to protect potable water systems from non-health hazard pollutants. It prevents backflow due to backsiphonage and backpressure, suitable for continuous pressure piping. Featuring a ductile iron body with an ArmorTek® advanced epoxy coating for corrosion resistance, it includes UL Classified/FM Approved OS&Y gate valves. The assembly offers easy in-line maintenance with no special tools required. Key features include a 175 psi maximum working pressure and a temperature range of 33°F to 140°F. Item number 0683076.
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Connections
This 4 inch backflow preventer features standard flanged end connections.
The flanges are compliant with ASME B16.1 Class 125 and AWWA Class D Flange standards.
Designed for installation on potable water supply lines in either horizontal or vertical up flow orientation.
The assembly includes four properly located resilient seated test cocks for field testing.
The FEBCO MasterSeries LF850 4 inch Lead Free Double Check Valve Assembly is designed to prevent the backflow of polluted water from entering potable drinking water systems due to backsiphonage or backpressure conditions.
This assembly is specifically intended for non-health hazard (pollutant) applications, offering protection in continuous pressure piping applications and at cross-connections identified as non-health hazards.
Construction & Design
Features a robust ductile iron body construction.
Equipped with OS&Y (Outside Stem & Yoke) gate valves which are UL Classified/FM Approved and compliant with AWWA C515.
Internal and external surfaces are coated with ArmorTek®, a patented three-part advanced epoxy system engineered to resist microbial-induced corrosion (MIC) and protect exposed metal substrate.
Designed with two in-line independent clapper style check modules featuring replaceable seats and disc rubbers.
Includes stainless steel check components, disc holders, and springs.
Incorporates a captured modular spring assembly and captured O-ring design.
Features a compact modular design that facilitates easy in-line maintenance.
Servicing of check modules does not require special tools and is accessed through independently top entry covers.
Includes properly located resilient seated test cocks for easy testing.
Suitable for horizontal and vertical up flow orientation.
This is a non-stock, special order item and could take up to 2 weeks or more to deliver. All non-stock items are non-refundable. Please ensure you order carefully, and contact us with any questions before placing your order.
Temperature Range: 33°F - 140°F (0.5°C - 60°C) Continuous
Materials
Main Valve Body: Ductile Iron Grade 65-45-12
Coating: ArmorTek® Advanced Epoxy Coating System
Check Seats: Stainless Steel
Disc Holder: Stainless Steel
Elastomer Disc: Silicone
Spring: Stainless Steel
Dimensions & Weight
Lay Length (A): 46 1/4 inches (1175 mm)
Weight (OSY Configuration): 323 lbs (147 kg)
Certificates & Approvals
Lead Free* Construction (wetted surface < 0.25% lead)
Approved by FCCCHR-USC (Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California)
ASSE 1015 Listed
UL Classified (U.S. & Canada)
FM Approved
IAPMO
CSA Listed
CSA B64.5
AWWA Standard C510 Compliant
AWWA Standard C515 Compliant (OS&Y Gate Valves)
NSF/ANSI 61-G Certified
End Connections: Compliant to ASME B16.1 Class 125 & AWWA Class D Flange
FAQs
What is the primary use of the Febco LF850 Double Check Valve Assembly?
The Febco LF850 Double Check Valve Assembly is designed to prevent the backflow of polluted water into potable drinking water systems from non-health hazard (pollutant) sources, protecting against backsiphonage and backpressure conditions.
What are the key construction materials of this backflow preventer?
This backflow preventer features a durable ductile iron valve body. It is internally and externally coated with ArmorTek®, a patented three-part advanced epoxy system, and includes stainless steel check components, disc holders, and springs with silicone elastomer discs.
Does this backflow assembly meet lead-free requirements?
Yes, the Febco LF850 is constructed with Lead Free* materials, ensuring 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 is the maximum operating pressure and temperature range for this unit?
This 4 inch LF850 backflow preventer has a maximum working pressure of 175 psi. It is designed to operate continuously within a temperature range of 33°F to 140°F (0.5°C to 60°C).
Are special tools required for servicing the Febco LF850?
No, this backflow assembly is designed for in-line servicing without the need for any special tools. Its captured modular spring assembly and top-entry covers facilitate easy maintenance of the check modules.
