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ES-F-856ST

S P E C I F I C AT 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 measure-ments, please contact FEBCO. FEBCO reserves the right to change or modify product design, construction, specifications, or materials with-out prior notice and without incurring any obligation to make such changes and modifications on FEBCO products previously or subsequentlysold.

Job Name Contractor

Job Location Approval

Engineer Contractors P.O. No.

Approval Representative

MasterSeries 856STDouble Check Detector Backflow

Prevention Assemblies

Size: 2

1

2

" - 10" (65mm - 250mm)

Model 856ST Double Check Detector Assembly

The FEBCO MasterSeries 856ST Double Check Detector Assembly is spe-cifically designed to protect against possible backpressure and backsiphon-age conditions for non-health hazard (i.e., pollutant) application in accor-dance with Local Governing Water Utility Code. This Backflow Assembly isprimarily used on potable drinking water systems where Local GoverningCode mandates protection from non-potable quality water being pumpedor siphoned back into the potable water system.

FeaturesMain Valve: InlineServiceableAssembly NoSpecialToolsRequiredforServicing

CapturedModularSpringAssembly Reversible&ReplaceableDiscs FieldReplaceableSeats DuctileIronValveBodyDesign StainlessSteelCheckComponents Winterizationfeaturewithdiscretainersandvalvebodydrainports ClapperCheckAssembly Commonalitybetween1st&2ndCheckComponents CapturedO-ringDesign

Auxiliary Bypass: CompactBypassDesign;RemainswithinMainValveAssemblyProfile InlineServiceable34 Backflow Assembly NoSpecialToolsRequiredforServicing FieldReplaceableSeats&Discs

DetectPotentialUndergroundWaterLeaks DetectUnauthorizedWaterUsage

SpecificationsTheFEBCOMasterSeries856STDoubleCheckDetectorValveAssemblyshall be installed on the potable water supply and at each point of cross-connection to protect against possible backpressure and backsiphonageconditions for non-health hazard (i.e., pollutant) applications. The assemblyshallconsistofamainlinevalvebodycomposedoftwo(2)independentlyacting approved clapper style check modules with replaceable seats anddisc rubbers. Servicing of both check modules does not require any speciatools and are accessed through independent top entry covers. This assem-bly shall be fitted with approved UL/FM inlet/outlet resilient seated shutoffvalves and contain four (4) properly located resilient seated test cocks asspecifiedbyAWWAStandardC510.Theauxiliarybypasslinecontainsa 58x34(16x19mm)WaterMeterthatcomplieswithANSI/AWWAStandardC700coupledwithanapproveddoublecheckassembly(DC)complianttoAWWAStandardC510.Thebypasslineisdesignedtodetectleaks or unauthorized water usage of the water system while protectingagainst possible backpressure and backsiphonage conditions for non-healthhazard (i.e., pollutant) application. Flow and pressure loss performanceparametersshallmeettherequirementsofAWWAStandardC510.

IMPORTANT: INQUIRE WITH GOVERNING AUTHORITIESFOR LOCAL INSTALLATION REQUIREMENTS

NOTE: The information contained herein is not intended to replace thefullproductinstallationandsafetyinformationavailableortheexperienceof a trained product installer. You are required to thoroughly read all instalation instructions and product safety information before beginning theinstallation of this product.

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Options - SuffixOSY: UL/FMApprovedOS&YGateValves(ANSI/AWWAC515

Compliant)

CFM:CubicFeetperMinute5/8x3/4WaterMeter(ANSI/AWWAC700Compliant)

GPM:GallonFeetperMinute5/8x3/4WaterMeter(ANSI/AWWAC700Compliant)

S: Wye-StrainerFDAApproved(ASMEB16.1Class125&AWWAClass D Flange)

LG: LessShutoffvalves;ThisisNOTanAPPROVEDASSEMBLYExample Ordering Descriptions:

4856ST-OSY-GPM-ValveAssemblyfittedwithOS&YShutoffValves&Gallon Feet per Minute Water Meter

4856ST-OSY-CFM-S-ValveAssemblyfittedwithOS&YShutoffValves,CubicfeetperMinuteWaterMeter&suppliedwithaninlinewye-strainer

Assembly Flow Orientation: Horizontal&VerticalUp(2128)-ApprovedbyFCCCHR-USC,ASSE,

UL,FM,IAPMO/UPC

Horizontal(10only)-ApprovedbyFCCCHR-USC,ASSE,UL,FM,IAPMO/UPC

MaterialsBelow is a general material list of the Model 856ST. All assemblies size212through10issimilarinmaterialsandconstruction.PleasecontactyourlocalFEBCORepresentativeifyourequirefurtherinformation.

MainValveBody: DuctileironGrade65-45-12

Coating: Fusionepoxycoatedinternalandexternal AWWAC550-90

ShutoffValves: OS&YresilientwedgegatevalvesAWWAC515(UL/FM)

Check Seats: Stainless Steel

DiscHolder: StainlessSteel

Elastomer Disc Silicone

Spring: Stainless Steel

Clamp: AWWAC606(10"Only)

1048 B64.5

Test Cock #1 Test Cock #2

First SpringAssembly

First CheckAssembly

Second SpringAssembly

Second CheckAssemblyShutoff Vavle #1 Shutoff Valve #2

Test Cock #3

Test Cock #4

Shutoff Valve #1 Shutoff Valve #2

Test Cock #3

Test Cock #4

Test Cock #2Test Cock #1

First CheckAssembly

First SpringAssembly

Second SpringAssembly

Second CheckAssembly

Approvals ApprovedbytheFoundationforCross-ConnectionControlandHydraulic

ResearchatTheUniversityofSouthernCalifornia(FCCCHR-USC)

ASSE1048Listed

**ULClassified(US&Canada)

**FMApproved

IAPMO/cUPC

AWWAStandardC510Compliant

EndConnections:ComplianttoASMEB16.1Class125&AWWAClassD Flange

**AssemblyconfiguredwithUL/FMApprovedOS&YRWGateValves.Less gate valve assemblies are not UL/FM approved configurations.

Pressure - TemperatureMax.WorkingPressure: 175psi(12.1bar)

Min.WorkingPressure: 10psi(0.7bar)

HydrostaticTestPressure: 350psi(24.1bar)

HydrostaticSafetyPressure: 700psi(48.3bar)

TemperatureRange: 33F-140F(0.5C-60C)Continuous

****

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Dimensions & WeightsBelow are the nominal dimensions and physical weights for the Model856STsize212"through10".Allowancesmustbemadefornormalmanufacturingtolerances.Pleasevisitourwebsitetodownloadacopyof this products installation instructions, or contact your local FEBCORepresentativeformoreinformation.

Model 856ST Assemblies

SIZE (DN) DIMENSIONS WEIGHT***

A B C E** F G H OSY

in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kg.

212 65 4034 1035 2512 648 10 254 1638 416 412 114 718 181 1338 340 245 111

3 80 4178 1064 2558 651 10 254 2217 565 412 114 738 187 1338 340 271 123

4 100 4614 1175 28 711 1018 257 2314 591 512 140 818 206 14 356 338 153

6 150 56 1422 3434 883 1234 324 3018 765 612 165 978 251 15 381 515 234

8 200 65 1651 4134 1061 1558 397 3734 959 7 178 1118 283 1534 400 826 375

10 250 7258 1845 4638 1178 1558 397 48 1219 9 229 1238 314 1534 400 1234 560

Note:

** Indicates nominal dimensions with OSY Gate Valves (Full Open Position)

*** Indicates weight of complete Backflow Assemblies with specified Gate Valves

A

B

C

D

G

F

E

E**

A

H

G

F

B

C

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USA: Fresno, CA Tel: (559) 441-5300 Fax: (559) 441-5301 www.FEBCOonline.com

Canada: Burlington, ON Tel: (905) 332-4090 Fax: (905) 332-7068 www.FEBCOonline.ca

ES-F-856ST 1206 2012 FEBCO

A Wat ts Water Technologies Co mpany

PerformanceFlow capacity chart identifies valve performance based upon rated waterVelocityupto20fps.

MaximumserviceflowrateisdeterminedbymaximumratedVelocityof7.5fps.

AWWAManualM-22(AppendixC)recommendsthatthemaximumwaterVelocityintheservicesbenotmorethan10fps.

ULflowrateisdeterminedbytypicallyratedVelocityof15feet/sec.

212" & 3" (65 & 80mm)kPa psi103 15

69 10

34 5

0 0

0 80 160 240 320 400 gpm

0 304 606 909 1211 1520 lpm

kPa psi

103 15

69 10

34 5

0 00 400 800 1200 1600 2000 gpm

0 1520 3040 4540 6050 7560 lpm

4" & 6" (100 & 150mm)

kPa psi

103 15

69 10

34 5

0 0

0 1000 2000 3000 4000 5000 gpm

0 3800 7560 11,350 15,140 18,920 lpm

8" & 10" (200 - 250mm)

HEADloSS(PSi)

HEADloSS

(PSi)

HEADloSS(PSi)