The Febco 3 inch LF850 Double Check Valve Assembly with Non-Rising Stem (NRS) gate valves prevents backflow of non-health hazard pollutants into potable water systems. Designed for backpressure and backsiphonage conditions, this lead-free unit features a durable ductile iron body with ArmorTek® epoxy coating for superior corrosion resistance. It offers in-line serviceability, stainless steel internal components, and flanged connections compliant with ASME B16.1 Class 125 and AWWA Class D Flange standards. Rated for a maximum working pressure of 175 psi and a temperature range of 33°F to 140°F. Item number 0124528.
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Connections
This 3 inch Febco LF850 Double Check Valve Assembly features flanged end connections. These connections are compliant to ASME B16.1 Class 125 and AWWA Class D Flange standards, ensuring compatibility with standard flanged piping systems.
The Febco 3 inch LF850 MasterSeries Lead Free Double Check Valve Assembly with Non-Rising Stem (NRS) gate valves is designed to protect potable drinking water systems from non-health hazard pollutants due to backpressure or backsiphonage conditions.
This in-line design backflow preventer is ideal for containing pollutants at the service line entrance or for general non-health hazard cross-connections.
Features
Lead Free* construction to comply with low lead installation requirements.
Ductile iron valve body construction (Grade 65-45-12).
ArmorTek® advanced epoxy coating applied to internal and external surfaces for protection against microbial-induced corrosion (MIC) and electrochemical corrosion.
Two (2) independently acting clapper-style stainless steel check modules with replaceable seats and disc rubbers.
In-line serviceable assembly requiring no special tools for servicing.
Captured modular spring assembly for ease of maintenance.
Reversible and replaceable silicone elastomer discs.
Field replaceable stainless steel check seats.
Winterization feature with disc retainers and valve body drain ports.
Commonality between 1st and 2nd check components.
*The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.
Specifications
General
Product Type: Double Check Valve Assembly
Series: LF850 MasterSeries
Valve Size: 3 inch
End Connections: Flanged
Operation: Non-Rising Stem (NRS) Gate Valves
Flow Orientation: Horizontal & Vertical Up
Lead Content: Less than 0.25% lead by weight (wetted surface)
Temperature Range: 33°F - 140°F (0.5°C ~ 60°C) Continuous
Lay Length: 41.875 inches (1064 mm)
Weight: 252 lbs (114 kg)
Certificates & Approvals
ASSE 1015 Listed
IAPMO Listed
CSA Listed
AWWA Standard C510 Compliant
NSF/ANSI 61-G Certified
Approved by Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California (FCCCHR-USC)
Compliant to ASME B16.1 Class 125 & AWWA Class D Flange
FAQs
What type of applications is the Febco LF850 Double Check Valve Assembly designed for?
It is specifically designed for non-health hazard (pollutant) applications to protect potable drinking water systems from backpressure and backsiphonage, such as containment at the service line entrance.
What material is the main valve body made from and how is it protected?
The main valve body is constructed from ductile iron Grade 65-45-12. It is protected with ArmorTek®, a patented three-part advanced epoxy system, applied to both internal and external surfaces to resist microbial-induced and electrochemical corrosion.
Are special tools required for servicing this backflow preventer?
No, the Febco LF850 Double Check Valve Assembly is designed for in-line serviceability and does not require any special tools for maintenance or replacement of components like discs and seats.
What are the maximum operating pressure and temperature range for this assembly?
This assembly has a maximum working pressure of 175 psi (12.1 bar) and operates continuously within a temperature range of 33°F to 140°F (0.5°C to 60°C).
What type of end connections does this 3-inch LF850 assembly have?
This assembly features flanged end connections. These connections are compliant with ASME B16.1 Class 125 and AWWA Class D Flange standards.
