Product Overview

ES-F-805YD
S P E C I F I C A T I O N S H E E T
FEBCO product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise mea-
surements, please contact FEBCO. FEBCO reserves the right to change or modify product design, construction, specifications, or materials
without prior notice and without incurring any obligation to make such changes and modifications on FEBCO products previously or subse-
quently sold.
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Approval
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Series 805YD
Double Check Valve Assemblies
Size: 2
1
⁄2" - 10" (65mm - 250mm)
The FEBCO Series 805YD Double Check Valve Assemblies are used to
prevent backflow of pollutants that are objectionable but not toxic. Double
Checks may be installed under continuous pressure service and may be
subjected to backpressure. Double checks can be used in sprinkler irriga-
tion systems, fire protection without chemical additives, protection of
industrial plants, industrial in-plant plumbing systems and other systems
requiring protection. Local codes may vary; consult authorities for specific
approved applications.
Features
• TheDuraCheckfeaturesallstainlesssteelcheckassembliesfor
corrosion resistance, reduced fouling and longer valve life.
• DuraCastductileironbodyforsuperiorstrength,corrosion
resistance and lighter weight.
• Lowheadloss
• DocumentedflowcurvesestablishedbyUniversityofSouthern
California Foundation for Cross-Connection Control and
Hydraulic Research.
• EndConnection–FlangedANSIB16.1
Operation
Inanonflowconditionthecheckvalveshold1psi(7kPa)minimuminthe
directionofflow.Inaflowconditionthecheckvalvesareopen,propor-
tionaltotheflowdemand.Inabackflowconditionbothcheckswillclose
until the resumption of normal flow.
Options
• SiliconSeatDiscs
• OS&YGateValves
• NRSGateValves
Specifications
Double check assemblies shall consist of two independent "Y"
configured check valves. Checks shall be of the spring loaded, center
stem guided type.
DuctileironbodiesshallbeflangedANSIB16.1,Class125andepoxy
coatedinternally10-20milsandepoxycoatedexternally.
The assembly shall include flanged, full port resilient wedge shutoff valves
and four full port ball valve testcocks, considered integral to the assembly.
All double check valve assemblies shall be constructed all internal parts,
including seat rings, can be serviced without removing the device from
the line. The assembly shall meet or exceed requirements of ASSE
standard1015,AWWAstandardC506-78,andtheUSCFoundationfor
Cross-connection Control and Hydraulic Research, seventh edition.
Double check valve assemblies shall be FEBCO, 805YD prior
approved equal.
Approvals – Standards
• ApprovedbytheFoundationforCross-ConnectionControland
 HydraulicResearchattheUniversityofSouthernCalifornia.*
• ANSI/AWWAConformance(C510-89)
* ValvesmustbesuppliedwithresilientseatedshutoffvalvesforUSC
andFMapprovalstobeineffect.ULandFMListingsonlyapplicable
withapprovedOS&Ygates.
Pressure – Temperature
Max.WorkingPressure: 175psi(12.1bar)
HydrostaticTestPress: 350psi(24.1bar)
TemperatureRange: 32ºFto140ºF(0ºCto60ºC)
Materials
MainValveBody/Cover: DuctileironASTMA-536grade65-45-12
  epoxycoatedinternal10-20mils
Main Valve Trim Bronze
InternalCheckAssembly: StainlessSteel
Elastomers: Nitrile
Springs: StainlessSteel
InternalCheckAssembly: StainlessSteel
Shutoffs: Non-risingstem,RWgates,standard.
Others available.
Coating: FusionbondedepoxyAWWAC550-90,
  USCFCCC&HRapproved.
805YD
1015 B64.5 3" - 10 "
(80 - 250mm)
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