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Febco Lead Free Double Check Assembly 4" NRS (DCA) | LF850-400-NRS
Febco LF850 - 4 inch Double Check Valve Lead Free DCA W/NRS
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Product Code: LF850-400-NRS

Description Reviews
Untitled Document

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: 33░F to 140░F (0░C to 60░C)


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

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