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. Job Name ––––––––––––––––––––––––––––––––––––––––––– Contractor –––––––––––––––––––––––––––––––––––––––––––– Job Location ––––––––––––––––––––––––––––––––––––––––– Approval ––––––––––––––––––––––––––––––––––––––––––––– Engineer –––––––––––––––––––––––––––––––––––––––––––– Contrac tor’s P.O. No. –––––––––––––––––––––––––––––––––– Approval –––––––––––––––––––––––––––––––––––––––––––– Representative –––––––––––––––––––––––––––––––––––––––– The FEBCO Series LF825Y 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. The LF825Y features Lead Free* construc- tion to comply with Lead Free* installation requirements. Features • Ultimatemec hanical protecti onofpotabl ewater ,against hazardsof cross-connection contamination. • Meetsallspecifications ofAWWA,A SSE,CSAandapprovedbythe Foundation for Cross-Connection Control and Hydraulic Research at the Uni ver sity ofS outh ernC ali for nia. • Flowcurv egenerated bytheF oundation ofCross- Connecti onControl andHydr aulicR esearchattheUni versity ofSouther nCalif ornia. • Modular reliefv alvef oreaseofma intenance . • Simple Serviceproce dures.A llinter nalpart sserviceabl einline. • Low head los s. • Springl oaded“ Y”typec heckv alves. • Internal reliefv alvepr essuresens ingpassage s. • Replac eableseat ringsonall sizes. • Endconnect ion–NPT ANSI/ ASM EB1 .20.1 Specifications The reduced pressure zone assembly shall consist of two independently operating,springloaded, “Y”patter ncheckv alvesandonehydrauli cally dependent differenti al relief valve. The assembly shall automatically reduce thepressureinthe“z one”betweenthec heckvalv estoatleast5psilower than inlet pressure. Should the differential between the upstream and the zone of the unit drop to 2psi, the diff erential relief valve shall open and main- tain the proper differential. Mainlinevalvebodyandcapsincludingreliefvalvebodyandcovershallbe LeadFree*bronz e.Checkval vemovingmembershallbecenter stemguid - ed. All hydraulic sensing passages shall be internally located within the main- line and relief valve bodies and relief valve cover. Diaphragm to seat area ratioshallbe1 0:1minimum.Reli efvalveshallha vearemovableseatring. Checkval veandreliefvalv ecomponentsshallbeconstructedsothe ymay be serviced without removing the valve body from the line. All seat discs shall berever sible. Shutof fvalvesandtest cocksshall befull ported ball v alves. Theassemblyshallberatedto1 75psi(12.1bar)w orkingpressureandwater temperaturerangefrom32°Fto140°F(0ºC-60ºC). The Lead Free* Reduced Pressure Zone Assemblies shall comply with state codes and standards, where applicable, requiring reduced lead content. Theassemblyshallmeettherequir ementsofASS EStandard10 13;A WWA StandardCodeC51 1;CSAStandardB64. 4;andapprovedbytheFounda tion for Cross-Connection Control and Hydraulic Hydraulic Research at the UniversityofSouthernCalifornia. Operation Inaflowconditionthecheckvalvesareopenwiththepressurebetween thechecks,calledthezone,beingmaintainedatleast5.0psilowerthanthe inlet pressure and the relief valve is maintained closed. Should abnormal conditions arise under no flow or reversal of flow, the differential relief valve will open and discharge to maintain the zone at least 2psi lower than the supply. Whennormalflowresumes,thezone’sdifferentialpressurewillresume and the relief valve will close. T ypical Installation Reduced pressure zone assemblies should be installed with minimum clearanceof12"(300mm)betweenreliefvalvedischargeportandflooror grade. They must be installed where discharge will not be objectionable and can be positively drained away. They should be installed where eas- ily accessible for testing and maintenance and must be protected from freezing.Thermalwaterexpansionand/orwaterhammerdownstreamof thebackflowpreventercancauseexcessivepressure.Excessivepressure situations should be eliminated to avoid possible damage to the system and assembly. Refer to local codes for specific installation requirements. Some codes may prohibit vertical installation. * The wetted surface of this product contacted by consumable water con- tainslessthanonequarterofonepercent(0.25%)ofleadbyweight. 30" Mx. (700mm) 12" Mn. (300mm) Flw ES-F-LF825Y SPECIF ICA TION SHEET Series LF825Y Lead Free* Reduced Pressure Zone Assemblies Size: 3 ⁄ 4" - 2" (20mm - 50mm) LEAD FREE LF825Y