The Febco 6" LF850 Lead Free Double Check Valve Assembly provides essential protection against backpressure and backsiphonage of non-health hazard pollutants into potable water systems. This MasterSeries backflow preventer features a durable ductile iron body with a patented ArmorTek® epoxy coating for superior corrosion resistance. It includes 6-inch NRS gate valves and standard flanged connections for reliable installation. Designed for in-line serviceability without special tools, it offers a maximum working pressure of 175 psi and operates in temperatures from 33°F to 140°F, making it ideal for various cross-connection control applications.
Help Me Connect
This Febco LF850 backflow preventer is designed for installation on potable water supply lines. It features standard flange end connections that comply with ASME B16.1 Class 125 and AWWA Class D Flange standards. The assembly includes NRS (Non-Rising Stem) resilient wedge gate valves, manufactured to AWWA C509 Standard.
This 6 inch lead free MasterSeries® LF850 double check valve assembly is designed for non-health hazard applications, protecting potable drinking water systems from pollutants caused by backpressure or backsiphonage. It is suitable for cross-connection control or containment at the service line entrance.
Features & Construction
Lead Free* construction to comply with low lead installation requirements
Ductile iron valve body design with flanged end connections
ArmorTek® coating technology, a patented three-part advanced epoxy system, applied to internal and external surfaces to resist microbial-induced corrosion (MIC) and protect exposed metal substrate
NRS (Non-Rising Stem) resilient wedge gate valves, AWWA C509 Standard
Two (2) in-line independent clapper style check modules with replaceable stainless steel seats and reversible, replaceable silicone discs
In-line serviceable assembly with no special tools required for servicing both check modules via independently accessed top entry covers
Captured modular spring assembly and captured O-ring design
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
Product Type: Double Check Valve Assembly
Model: LF850 MasterSeries®
Nominal Size: 6 inch
Shutoff Valves: NRS (Non-Rising Stem) Gate Valves
Body Material: Ductile Iron Grade 65-45-12
Body Coating: ArmorTek® Powder Coating (internal and external)
Check Components: Stainless Steel
Disc Material: Silicone (Elastomer Disc)
Spring Material: Stainless Steel
Connection Type: Standard Flange
Lay Length: 56 inch (1422 mm)
Weight (NRS): 478 lbs (217 kg)
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
Certificates & Approvals
Approved by the Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California (FCCCHR-USC)
ASSE 1015 Listed
UL Classified (U.S. & Canada)
FM Approved
IAPMO
CSA Listed
AWWA Standard C510 Compliant
AWWA C509 Standard (for shutoff valves)
End Connections: Compliant to ASME B16.1 Class 125 & AWWA Class D Flange
FAQs
What is the main purpose of the Febco 6" LF850 Double Check Valve Assembly?
The primary purpose of this assembly is to protect potable drinking water systems from contamination by non-health hazard pollutants, preventing backflow due to backpressure or backsiphonage conditions.
What materials are used in the construction of the LF850 backflow preventer?
The main valve body is made of ductile iron grade 65-45-12, coated with ArmorTek® advanced epoxy. Check components, disc holders, and springs are stainless steel, while the discs are made of silicone.
Does the Febco 6" LF850 require special tools for maintenance?
No, this assembly is designed for in-line serviceability, and no special tools are required for servicing the check modules, which are accessed through independently operated top entry covers.
What are the connection types and shutoff valves included with this 6-inch model?
This model features standard flanged end connections that comply with ASME B16.1 Class 125 and AWWA Class D Flange standards. It comes with NRS (Non-Rising Stem) resilient wedge gate valves.
What are the maximum operating pressure and temperature limits for this device?
The Febco 6" LF850 has a maximum working pressure of 175 psi (12.1 bar) and can operate continuously in a temperature range of 33°F to 140°F (0.5°C to 60°C).
