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Febco LF850 Lead Free DCA Backflow Preventer 4 in. NRS Gate Valves | LF850-400-NRS

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Febco LF850-400-NRS 4 in. Lead Free DCA W/NRS Valve

MasterSeries LF860 Lead Free* Reduced Pressure Zone Assemblies are used to protect against high hazard (toxic) fluids in water services to industrial plants, hospitals, morgues, mortuaries, and chemical plants. They are also used in irrigation systems, boiler feed, water lines and other installations requiring maximum protection. They feature an epoxy coated ductile iron body and OSY shutoff valves. Maximum Working Pressure: 175psi (12.1 bar).

Pressure - Temperature
  • Maximum Working Pressure: 175psi (12.1 bar)
  • Min. Working Pressure: 20psi ( 1.4 bar)
  • Hydrostatic Test Press: 350psi (24.1 bar)
  • Hydrostatic Safety Pressure: 700psi (48.3 bar)
  • Temperature Range: 33F to 140F (0C to 60C)

Below is general materials list of the Series LF860. All assemblies size 2.5" through 10" is similar in materials and construction. Please contact your local FEBCO Representative if you require further information.

  • Main Valve Body: Ductile iron Grade 65-42-12
  • Relief Valve Body: Ductile iron Grade 65-45-12
  • Coating: Fusion epoxy coated internal and external AWWA C550
  • Shutoff Valves: NRS resilient wedge gate valve AWWA C509 (standard) OSY resilient wedge gate valve AWWA C515 (UL/FM)
  • Check Seats: Stainless Steel
  • Disc Holder: Stainless Steel
  • Elastomer Disc: Silicone
  • Spring: Stainless Steel
  • Clamp: AWWA C606 (10" only)
Feature & Benefits
  • Inline Serviceable Assembly
  • No Special Tools Required for Servicing
  • Captured Modular Spring Assembly
  • Reversible and Replaceable Discs
  • Field Replaceable Seats
  • Ductile Iron ValveBody Design
  • Stainless Steel Check Components
  • Modular Pressure Differential Relied Valve
  • Clapper Check Assemmbly
  • Captured O-ring Design
Approvals - Standards
  • ASSE01013 LIsted
  • UL Classified
  • FM Approved
  • AWWA Standard C511 Compliant
  • End Connections: Compliant to ASME B16.1 Class 125 & AWWA Class D Flange
  • Assembly configured with UL/FM Approved OS&Y RW Gate Valves. Less gate valve assemblies are not UL/FM approved configurations.
  • Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California.

Diagram: LF850-300-NRS 3 inch Lead Free RPS w/NRS Valve RPZ Assemblies

Manual & Literature Specifications Installation
Test Cocks:
Min Working Pressure:
10 PSI
Max Working Pressure:
175 PSI
Hydrostatic Test Pressure:
350 PSI
Hydrostatic Safety Pressure:
700 PSI
Temperature Range:
33F to 140F
Main Valve Body Materials:
Ductive Iron Grade 65-45-12
Stainless Steel
Advance Features:
Lead Free
1 Year
4 in.
NRS Gate Valves
Lead Free:
Lead Free
Specifications (509.61 kB)