Tideflex Advantage Brochure 2017

Open Access / Tideflex Duckbill Valves

Brochure containing indepth details on the design history and innovation of the Tideflex duckbill valve for drainage outfalls.

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2. “We hope you find the information provided here to be useful. It is part of our ongoing commitment to provide the technical innovation and support that have made Tideflex ® products the world standard for more than 30 years”. Chris R. Raftis President Spiros G. Raftis Founder Building on a Legacy of Leadership. Nearly 60 years ago, Spiros G. Raftis founded Red Valve Company on a simple promise: provide the highest quality engineered valves, with an unsurpassed level of technical innovation— anywhere. And with that promise began a legacy of leadership—and a never-ending quest to solve the toughest challenges and exceed our customers’ expectations. As today’s world leader in pinch valve and check valve technology, that legacy lives on each day at Red Valve Company and Tideflex ® Technologies. It is supported by Mr. Raftis’ son Chris, along with the hundreds of Red Valve and Tideflex Technologies employees dedicated to keeping the promise Mr. Raftis made more than 50 years ago. Being the world leader in valve technology is more than a slogan —it ’s a promise. And it’s one we intend to keep for a long, long time. Call us any time. We’re ready to speak with you personally—right now. This page intentionally left blank.

13. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge Still Ahead of the Curve! The pl A in T ru T h 12CheckValves Don’tbeFooledbyOtherManufacturers Togainbottomclearancewheninstallingrubber“duckbill” valves,othermanufacturerswillcompromiseyourdesign andinstallationbywrongfullyadvisingyouthattheirvalves canberotatedupto45°fromvertical.Insizes12"and larger,allvalvesthatareinstalledinarotatedposition willdistort,gapopenandleak.Mostimportantly,any rotationcompromisesthestructuralintegrityofthevalve duetoanunequaldistributionofvalveandwaterweight. Rotatingthebillfromverticalcausesthevalvetogapopen whichresultsinthevalvenotbeingabletosealproperly andpreventbackflow.Also,considerabledistortionofthe billandvalveoccursfrombuoyancyeffectsontheprojected surfaceareaoftherotatedbill,resultinginleakage. TheeccentricTF-1CheckValve’sflatbottomdesignallows ustokeepthebillintheverticalpositionandeliminatethe possibilityofthecheckvalvedistortingandgappingopen. Rotatingacheckvalvewillresultindistortion,gappingandleakage. Rubber“duckbill”checkvalve rotatedtogainbottomclearance. Valveweight+waterweight resultsinexcessiveloadon bottompartofvalve. Toppartofvalvewillnotdeflect asmuchasthebottom,resulting inthevalvegappingopen. TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 10:09 AM Page 15 CheckValves13 Changingthepitchofapipewillrobavailabledrivinghead. Notonlydoespitchingthecheckvalvecreategreater headloss,italsoallowsforstandingwatertocollectinside thepipeline.Standingwaterwillcollectandstagnate,at thecuffandwherethesaddlemeetsthebill.Thesaddle anglesdownwardpastthecuff,whichwillalsotrap sedimentationanddebris. DangersofAlteringthePipePitch Anothertacticusedbyothermanufacturersistorecommend installingnon-eccentricduckbillvalvesusingmethodsthat changethepitchofthepipe,asshownintheillustration below.Theinvertofthepipehasbeenraised.Thiswillrob availabledrivinghead. Thebelowdrawingisofaproposed42"checkvalve installationofferedbyanothermanufacturer.Themost significantproblemwiththisinstallationisthereisa9° angleatthecuff,whichraisestheinvert7".Drivingheadis thereforereducedby7".Forexample,iftheapplicationhas atotalupstreamelevationchangeof3feet(adrivinghead of3feet)theheadpressureisreduced20%. THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 10:09 AM Page 16

14. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge Still Ahead of the Curve! The pl A in T ru T h 12CheckValves Don’tbeFooledbyOtherManufacturers Togainbottomclearancewheninstallingrubber“duckbill” valves,othermanufacturerswillcompromiseyourdesign andinstallationbywrongfullyadvisingyouthattheirvalves canberotatedupto45°fromvertical.Insizes12"and larger,allvalvesthatareinstalledinarotatedposition willdistort,gapopenandleak.Mostimportantly,any rotationcompromisesthestructuralintegrityofthevalve duetoanunequaldistributionofvalveandwaterweight. Rotatingthebillfromverticalcausesthevalvetogapopen whichresultsinthevalvenotbeingabletosealproperly andpreventbackflow.Also,considerabledistortionofthe billandvalveoccursfrombuoyancyeffectsontheprojected surfaceareaoftherotatedbill,resultinginleakage. TheeccentricTF-1CheckValve’sflatbottomdesignallows ustokeepthebillintheverticalpositionandeliminatethe possibilityofthecheckvalvedistortingandgappingopen. Rotatingacheckvalvewillresultindistortion,gappingandleakage. Rubber“duckbill”checkvalve rotatedtogainbottomclearance. Valveweight+waterweight resultsinexcessiveloadon bottompartofvalve. Toppartofvalvewillnotdeflect asmuchasthebottom,resulting inthevalvegappingopen. TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 10:09 AM Page 15 CheckValves13 Changingthepitchofapipewillrobavailabledrivinghead. Notonlydoespitchingthecheckvalvecreategreater headloss,italsoallowsforstandingwatertocollectinside thepipeline.Standingwaterwillcollectandstagnate,at thecuffandwherethesaddlemeetsthebill.Thesaddle anglesdownwardpastthecuff,whichwillalsotrap sedimentationanddebris. DangersofAlteringthePipePitch Anothertacticusedbyothermanufacturersistorecommend installingnon-eccentricduckbillvalvesusingmethodsthat changethepitchofthepipe,asshownintheillustration below.Theinvertofthepipehasbeenraised.Thiswillrob availabledrivinghead. Thebelowdrawingisofaproposed42"checkvalve installationofferedbyanothermanufacturer.Themost significantproblemwiththisinstallationisthereisa9° angleatthecuff,whichraisestheinvert7".Drivingheadis thereforereducedby7".Forexample,iftheapplicationhas atotalupstreamelevationchangeof3feet(adrivinghead of3feet)theheadpressureisreduced20%. THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 10:09 AM Page 16

1. Tideflex ® Technologiesoffersa fulllineofcheck valvesand e ngineeredsystems for water mixing, aerationand effluent diffusers. Tideflex ® Technologiesoffersafulllineofcheckvalvesandengineeredsystems forwatermixing,aerationandeffluentdiffusers. 600N.BellAvenue Carnegie,PA15106 p:412.279.0044 f:412.279.7878 info@tideflex.com www.tideflex.com Thisinformationpresentedinthis brochureisprovidedingoodfaith.Red ValveCompany,Inc.andTideflex ® Technologiesreservestherighttomodi- fyorimproveitsdesignspecifications withoutnotice,anddoesnotimplyany gu aranteeo rwarrantyforanyofits products fromrelianceuponthe informationcontainedherein.Allorders aresubjecttoRedValveCompany,Inc. andTideflex ® Technologies’standard termsandwarrantyandaresubjectto finalacceptancebyRedValveCompany, Inc.andTideflex ® Technologies. Tideflex ® CurvedBill Patent#5,727,593. Tideflex ® TF-1CheckValve Patent#5,931,197. Tideflex ® ,RedValve,andtheRedValve “rv”logoareregisteredtrademarksof theRedVal veC ompany,Inc. © 2010RedValveCompany,Inc. Allrightsreserved. RecycledPaper TFTF11/10 THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! TIDEFLEX ® CHECKVALVES Thebestcheckvalveintheworldreplaceshigh-maintenance flapgatestoensurereliablebackflowpreventiononstormwater, effluentandCSOoutfalls.Availableinsizesto96”. Tideflex ® EffluentDiffuserspreventintrusionofdebris, sediment,saltwaterandaquaticlifeintooutfalllineswhile optimizingdiffuserhydraulics. T heuniquewafer-thinelastomerWaterflex ® CheckValve providesreliablebackflowpreventionwithnomovingpartsthat requiremaintenanceorrepairs.Availableinsizesto96”. INLINECHECKVALVES AERATIONSYSTEMS RESERVOIRMIXINGSYSTEMS EFFLUENTDIFFUSERSYSTEMS WATERFLEX ® CHECKVALVES DesignedwiththeTideflex ® CheckValve,theSeries39,39F,4739 and4739-Rprovidemaintenance-freebackflowprevention. Availableinsizesto96”. Tideflex ® DiffusedAerationSystemsutilizebackflowprevention technologytoprovideamaintenance-freesystem.Finebubble, coarsebubbleandcombinationaerationsystemsareavailable. TheTideflex ® MixingSystemimproveswaterqualityinfinished waterstoragetanksandreservoirsofanysizeorstyle.The customengineeredsystemspreventshort-circuiting,stagnation, thermalstratificationandoptimizemixing. The Tideflex ® Adv A n TA ge Still Ahead of the Curve! Tideflex ® Technologiesoffersafulllineofcheckvalvesandengineered systemsforwatermixing,aerationandeffluentdiffusers. 600N.BellAvenue Carnegie,PA15106 p:412.279.0044 f:412.279.7878 info@tideflex.com www.tideflex.com Thisinformationpresentedinthisbrochure isprovidedingoodfaith.RedValveCompany, Inc.andTideflex ® Technologiesreserves therighttomodifyorimproveitsdesign specificationswithoutnotice,anddoesnot implyanyguaranteeorwarrantyforanyofits productsfromrelianceupontheinformation containedherein.Allordersaresubjectto RedValveCom pany,I nc.andTideflex ® Technologies’standardtermsandwarranty andaresubjecttofinalacceptanceby RedValveCompany,Inc.and Tideflex ® Technologies. Tideflex ® CurvedBill Patent#5,727,593. Tideflex ® TF-1CheckValve Patent#5,931,197. Tideflex ® ,RedValve,andtheRedValve“rv” logoareregisteredtrademarksof theRedValveCompany,Inc. ©2010RedValveCompany,Inc. Allrightsreserved. RecycledPaper TFTF15/10 NEWCHECKMATE ™ INLINECHECKVALVES Thecustom-engineered,all-rubberunibodydesignofthe CheckMate ™ InlineCheckValveeliminatescostlybackflow. Thevalvehasverylowheadloss,whichisespeciallybeneficial inlow-lyingareas. Tideflex ® EffluentDiffuserspreventintrusionofdebris, sediment,saltwaterandaquaticlifeintooutfalllines whileoptimizingdiffuserhydraulics. Theuniquewafer-thinelastomerWaterflex ® CheckValve providesreliablebackflowpreventionwithnomovingparts thatrequiremaintenanceorrepairs.Availableinsizesto96". INLINECHECKVALVES AERATIONSYSTEMS RESERVOIRMIXINGSYSTEMS EFFLUENTDIFFUSERSYSTEMS WATERFLEX ® CHECKVALVES DesignedwiththeTideflex ® CheckValve,theSeries39,39F, 4739and4739-Rprovidemaintenance-freebackflow prevention.Availableinsizesto96". Tideflex ® DiffusedAerationSystemsutilizebackflowprevention technologytoprovideamaintenance-freesystem.Finebubble, coarsebubbleandcombinationaerationsystemsareavailable. TheTideflex ® MixingSystemimproveswaterqualityinfinished waterstoragetanksandreservoirsofanysizeorstyle. The customengineeredsystemspreventshort-circuiting, stagnation,thermalstratificationandoptimizemixing. TF1_ComparisonREVISED4.30.10:Layout 1 4/30/10 4:00 PM Page 1

19. Tideflex ® Technologies offers a full line of check valves and engineered systems for water mixing, aeration and effluent diffusers. Tideflex ® Technologiesoffersafulllineofcheckvalvesandengineeredsystems forwatermixing,aerationandeffluentdiffusers. 600N.BellAvenue Carnegie,PA15106 p:412.279.0044 f:412.279.7878 info@tideflex.com www.tideflex.com Thisinformationpresentedinthis brochureisprovidedingoodfaith.Red ValveCompany,Inc.andTideflex ® Technologiesreservestherighttomodi- fyorimproveitsdesignspecifications withoutnotice,anddoesnotimplyany gu aranteeo rwarrantyforanyofits products fromrelianceuponthe informationcontainedherein.Allorders aresubjecttoRedValveCompany,Inc. andTideflex ® Technologies’standard termsandwarrantyandaresubjectto finalacceptancebyRedValveCompany, Inc.andTideflex ® Technologies. Tideflex ® CurvedBill Patent#5,727,593. Tideflex ® TF-1CheckValve Patent#5,931,197. Tideflex ® ,RedValve,andtheRedValve “rv”logoareregisteredtrademarksof theRedVal veC ompany,Inc. © 2010RedValveCompany,Inc. Allrightsreserved. RecycledPaper TFTF11/10 THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! TIDEFLEX ® CHECKVALVES Thebestcheckvalveintheworldreplaceshigh-maintenance flapgatestoensurereliablebackflowpreventiononstormwater, effluentandCSOoutfalls.Availableinsizesto96”. Tideflex ® EffluentDiffuserspreventintrusionofdebris, sediment,saltwaterandaquaticlifeintooutfalllineswhile optimizingdiffuserhydraulics. T heuniquewafer-thinelastomerWaterflex ® CheckValve providesreliablebackflowpreventionwithnomovingpartsthat requiremaintenanceorrepairs.Availableinsizesto96”. INLINECHECKVALVES AERATIONSYSTEMS RESERVOIRMIXINGSYSTEMS EFFLUENTDIFFUSERSYSTEMS WATERFLEX ® CHECKVALVES DesignedwiththeTideflex ® CheckValve,theSeries39,39F,4739 and4739-Rprovidemaintenance-freebackflowprevention. Availableinsizesto96”. Tideflex ® DiffusedAerationSystemsutilizebackflowprevention technologytoprovideamaintenance-freesystem.Finebubble, coarsebubbleandcombinationaerationsystemsareavailable. TheTideflex ® MixingSystemimproveswaterqualityinfinished waterstoragetanksandreservoirsofanysizeorstyle.The customengineeredsystemspreventshort-circuiting,stagnation, thermalstratificationandoptimizemixing. The Tideflex ® Adv A n TA ge Still Ahead of the Curve! Tideflex ® Technologiesoffersafulllineofcheckvalvesandengineered systemsforwatermixing,aerationandeffluentdiffusers. 600N.BellAvenue Carnegie,PA15106 p:412.279.0044 f:412.279.7878 info@tideflex.com www.tideflex.com Thisinformationpresentedinthisbrochure isprovidedingoodfaith.RedValveCompany, Inc.andTideflex ® Technologiesreserves therighttomodifyorimproveitsdesign specificationswithoutnotice,anddoesnot implyanyguaranteeorwarrantyforanyofits productsfromrelianceupontheinformation containedherein.Allordersaresubjectto RedValveCom pany,I nc.andTideflex ® Technologies’standardtermsandwarranty andaresubjecttofinalacceptanceby RedValveCompany,Inc.and Tideflex ® Technologies. Tideflex ® CurvedBill Patent#5,727,593. Tideflex ® TF-1CheckValve Patent#5,931,197. Tideflex ® ,RedValve,andtheRedValve“rv” logoareregisteredtrademarksof theRedValveCompany,Inc. ©2010RedValveCompany,Inc. Allrightsreserved. RecycledPaper TFTF15/10 NEWCHECKMATE ™ INLINECHECKVALVES Thecustom-engineered,all-rubberunibodydesignofthe CheckMate ™ InlineCheckValveeliminatescostlybackflow. Thevalvehasverylowheadloss,whichisespeciallybeneficial inlow-lyingareas. Tideflex ® EffluentDiffuserspreventintrusionofdebris, sediment,saltwaterandaquaticlifeintooutfalllines whileoptimizingdiffuserhydraulics. Theuniquewafer-thinelastomerWaterflex ® CheckValve providesreliablebackflowpreventionwithnomovingparts thatrequiremaintenanceorrepairs.Availableinsizesto96". INLINECHECKVALVES AERATIONSYSTEMS RESERVOIRMIXINGSYSTEMS EFFLUENTDIFFUSERSYSTEMS WATERFLEX ® CHECKVALVES DesignedwiththeTideflex ® CheckValve,theSeries39,39F, 4739and4739-Rprovidemaintenance-freebackflow prevention.Availableinsizesto96". Tideflex ® DiffusedAerationSystemsutilizebackflowprevention technologytoprovideamaintenance-freesystem.Finebubble, coarsebubbleandcombinationaerationsystemsareavailable. TheTideflex ® MixingSystemimproveswaterqualityinfinished waterstoragetanksandreservoirsofanysizeorstyle. The customengineeredsystemspreventshort-circuiting, stagnation,thermalstratificationandoptimizemixing. TF1_ComparisonREVISED4.30.10:Layout 1 4/30/10 4:00 PM Page 1

9. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge Still Ahead of the Curve! T ideflex ® T he n ex T g en er AT io n 8CheckValves EccentricTF-1CheckValve GeometryandImprovedStructure MorethantenyearsbeforetheoriginalTF-2CheckValve patenthadexpired,theEccentricTF-1CheckValvewasintroduced becauseitisstronger,haslessheadlossandaddressestheneeds ofinstallationswithminimalbottomclearance. Ourmostsignificanttechnologicaladvancementoccuredwhen Tideflex ® Technologiestested,patentedandintroducedthe EccentricTF-1CheckValve. Whetherslip-onorflanged,EccentricTF-1CheckValvesare cantileveredwheninstalledattheendofapipe,flangeorheadwall. Only theEccentricTF-1isabletowithstandtheweightofthevalveandthe weightofwaterinsidethevalve withsignificantlylessdeflection. TheTF-1’seccentricgeometric designandincreasedspineangle maximizethestructuralintegrity andperformanceofthevalve.As aresult,theeccentricTF-1has beenproventodeflect30-40% lessthantheTF-2,minimizing thepossibilityofsagging.The potential forsaggingissignificant consideringthetotalweight ofthevalvesandwater. TheTF-1spineisatagreaterangle,reducingthe cantilevereffectsofwaterweight ThecantileverspineoftheTF-1 supportsgreaterweightthan theTF-2design. P A R T S A N D W A T E R W E I G H T S V A L V E SIZE T F - 1 W E I G H T POUNDS W A T E R W E I G H T POUNDS T O T A L W E I G H T POUNDS T O T A L W E I G H T TONS 24" 130 637 767 0.3 30" 220 1072 1292 0.6 32" 300 1380 1680 0.7 36" 560 1801 2361 1.1 42" 800 2702 3502 1.6 48" 1027 3855 4882 2.2 60" 1660 7556 9216 4.1 72" 2620 13968 16588 7.4 84" 3880 18411 22291 10.0 90" 4664 23030 27670 12.4 TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 9:48 AM Page 11 CheckValves9 • IndependentHydraulicTesting • CurvedBillDesignEnhancesSealing • SignificantlyLowerHeadloss • ImprovedStructuralIntegrity • EccentricFlat-bottomDesign • LessBottomClearanceRequired • IncreasesFlowCapacity TheEccentricTideflex ® TF-1CheckValveisthepreferredcheckvalve foroutfalls.Designedforin-structureandend-of-pipeconfigurations, theTF-1featuresaflatbottomandaflaredtop.Thisallowsthecheck valvetobeinstalledataloweroverallelevationcomparedtoother configur ationsbecauselessbottomclearanceisrequired.Thisis especiallyimportantinlow-lyingareaswheremaintainingasmuch drivingheadaspossibleiscritical,orwheresilt,sandanddebris mightcollectbeneaththevalve. TheEccentricTF-1CheckValveisidealforapplicationssuchas junctionboxes,diversionchambersandinterceptorswherethe invertofthepipeisclosetothefloorofthevault.Thesestructures aredesignedtomaximizetheavailablegravityhead,thusthepipe invert isasclosetotheflooraspossible.TheTF-1allowsinstallation inexistingstructureswithouttheneedtobreakuptheconcretefloor toachievebottomclearance.Fornewstructures,constructioncosts arereducedbecausetherequireddepthisminimized. TheEccentricTF-1CheckValveisdesignedto accommodateinstallationswithlittlegroundclearance. THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 9:49 AM Page 12

10. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge StillAheadoftheCurve! T ideflex ® T he n ex T g en er AT io n 8CheckValves EccentricTF-1CheckValve GeometryandImprovedStructure MorethantenyearsbeforetheoriginalTF-2CheckValve patenthadexpired,theEccentricTF-1CheckValvewasintroduced becauseitisstronger,haslessheadlossandaddressestheneeds ofinstallationswithminimalbottomclearance. Ourmostsignificanttechnologicaladvancementoccuredwhen Tideflex ® Technologiestested,patentedandintroducedthe EccentricTF-1CheckValve. Whetherslip-onorflanged,EccentricTF-1CheckValvesare cantileveredwheninstalledattheendofapipe,flangeorheadwall. Only theEccentricTF-1isabletowithstandtheweightofthevalveandthe weightofwaterinsidethevalve withsignificantlylessdeflection. TheTF-1’seccentricgeometric designandincreasedspineangle maximizethestructuralintegrity andperformanceofthevalve.As aresult,theeccentricTF-1has beenproventodeflect30-40% lessthantheTF-2,minimizing thepossibilityofsagging.The potential forsaggingissignificant consideringthetotalweight ofthevalvesandwater. TheTF-1spineisatagreaterangle,reducingthe cantilevereffectsofwaterweight ThecantileverspineoftheTF-1 supportsgreaterweightthan theTF-2design. P A R T S A N D W A T E R W E I G H T S V A L V E SIZE T F - 1 W E I G H T POUNDS W A T E R W E I G H T POUNDS T O T A L W E I G H T POUNDS T O T A L W E I G H T TONS 24" 130 637 767 0.3 30" 220 1072 1292 0.6 32" 300 1380 1680 0.7 36" 560 1801 2361 1.1 42" 800 2702 3502 1.6 48" 1027 3855 4882 2.2 60" 1660 7556 9216 4.1 72" 2620 13968 16588 7.4 84" 3880 18411 22291 10.0 90" 4664 23030 27670 12.4 TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 9:48 AM Page 11 CheckValves9 • IndependentHydraulicTesting • CurvedBillDesignEnhancesSealing • SignificantlyLowerHeadloss • ImprovedStructuralIntegrity • EccentricFlat-bottomDesign • LessBottomClearanceRequired • IncreasesFlowCapacity TheEccentricTideflex ® TF-1CheckValveisthepreferredcheckvalve foroutfalls.Designedforin-structureandend-of-pipeconfigurations, theTF-1featuresaflatbottomandaflaredtop.Thisallowsthecheck valvetobeinstalledataloweroverallelevationcomparedtoother configur ationsbecauselessbottomclearanceisrequired.Thisis especiallyimportantinlow-lyingareaswheremaintainingasmuch drivingheadaspossibleiscritical,orwheresilt,sandanddebris mightcollectbeneaththevalve. TheEccentricTF-1CheckValveisidealforapplicationssuchas junctionboxes,diversionchambersandinterceptorswherethe invertofthepipeisclosetothefloorofthevault.Thesestructures aredesignedtomaximizetheavailablegravityhead,thusthepipe invert isasclosetotheflooraspossible.TheTF-1allowsinstallation inexistingstructureswithouttheneedtobreakuptheconcretefloor toachievebottomclearance.Fornewstructures,constructioncosts arereducedbecausetherequireddepthisminimized. TheEccentricTF-1CheckValveisdesignedto accommodateinstallationswithlittlegroundclearance. THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 9:49 AM Page 12

5. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge Still Ahead of the Curve! Tes T ing A nd M odeling IndependentHydraulicTesting Tideflex ® Technologieshasconductedextensiveindependenthydraulic testingofcheckvalvessincethe1980s. Comprehensivetestingwasrequiredandamassiveamountofdatawas analyzedtomodeltheeffectofvalvegeometryandrelativestiffnesson hydraulics.CheckValvesweretestedfrom2"-48"innumeroushydraulic variationswithineachsize.Valvesweretestedforfreedischarge, submergedandpartiallysubmergedconditions. Withthisextensiveamountoftestdata,Tideflex ® Technologiesdeveloped modelingprogramsusedtoprovidehydrauliccharacteristiccurvesforevery Tideflex ® CheckValve. In-houseTesting Tosupplementtheindependenthydraulictesting,Tideflex ® Technologies continuallyconductsresearchanddevelopmentandtestingtoimprove existingproductsandtodevelopnewproducts.Inaddition,extensivefield studiesareconductedtovalidateproductdesignforlong-termperformance. ATideflex ® CheckValvebeingtestedbyan independentlaboratory. In-housebackpressuretestingofa36"Tideflex ® CheckValve. 4CheckValves Independenttestingofa48"Tideflex ® CheckValve. TF1_ComparisonREVISED4.30.10:Layout 1 4/30/10 4:00 PM Page 7 CheckValves5 FiniteElementAnalysis(FEA) Fromtheoutside,Tideflex ® CheckValvesappeartobeasimple rubbervalvemanufacturedinaduckbillshape.However,foreach Tideflex ® CheckValvetherecanbehundredsoflayersofvarious naturalandsyntheticelastomersandfabric-reinforcedplies. Thisallowsustodesignfordrasticallydifferentcharacteristics suchasresilience,durometer,compressionsetresistance, tensilestrengthandelongation.EachTideflex ® CheckValve iscustomizedtomeetyourspecifichydraulicneeds. Tideflex ® Technologieshasconductedanextensiveamountof FiniteElementAnalysis(FEA)modelstoanalyzethestress,strain, forceanddeflectioncharacteristicsundermanyloadconditions. Modelingwasrunfordischargingandbackpressureconditions. Theseresultswereusedindevelopingdetailedfabrication protocolssothatTideflex ® CheckValveswillwithstandall ofthelong-termvariableloadconditions,whileproducing thedesiredhydrauliccharacteristics. HydraulicVariations Withtheextensiveamountofdatacollected,Tideflex ® Technologiesdevelopsmodelingprogramswhichallowusto selecttheoptimalcheckvalveforyouruniqueapplicationneeds. Tideflex ® CheckValvesarenot“onesizefitsall.” Thereareuptofiftydifferentvariationsofcheckvalveswithin eachnominalsize.Eachvariationhasitsownhydraulic characteristicsforheadloss,jetvelocity,effectivediameterand backpressurerating.Thisisachievedbychangingthegeometry andrelativestiffnessofthevalve. Tideflex ® CheckValvesareconstructedsimilartoatrucktire withmanytypesofelastomersandfabric-reinforcedplies.Each materialhasadifferentmechanicalproperty.Whencombined intoaunibodyconstructionthesematerialsproducespecific hydrauliccharacteristics. OnlyTideflex ® Technologieshasperformedextensivehydraulic testingandbackpressuretestingtocorrelatethespecific constructiondetailswiththehydraulicperformanceand backpressureratingofeachvalve. AFiniteElementAnalysismodelofaTideflex ® CheckValve. VariousconfigurationsofTideflex ® CheckValves andDiffuserNozzles. VariousconfigurationsofTideflex ® CheckValves showingdifferentbillthickness. THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! TF1_ComparisonREVISED4.30.10:Layout 1 5/18/10 9:36 AM Page 8

6. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge Still Ahead of the Curve! Tes T ing A nd M odeling IndependentHydraulicTesting Tideflex ® Technologieshasconductedextensiveindependenthydraulic testingofcheckvalvessincethe1980s. Comprehensivetestingwasrequiredandamassiveamountofdatawas analyzedtomodeltheeffectofvalvegeometryandrelativestiffnesson hydraulics.CheckValvesweretestedfrom2"-48"innumeroushydraulic variationswithineachsize.Valvesweretestedforfreedischarge, submergedandpartiallysubmergedconditions. Withthisextensiveamountoftestdata,Tideflex ® Technologiesdeveloped modelingprogramsusedtoprovidehydrauliccharacteristiccurvesforevery Tideflex ® CheckValve. In-houseTesting Tosupplementtheindependenthydraulictesting,Tideflex ® Technologies continuallyconductsresearchanddevelopmentandtestingtoimprove existingproductsandtodevelopnewproducts.Inaddition,extensivefield studiesareconductedtovalidateproductdesignforlong-termperformance. ATideflex ® CheckValvebeingtestedbyan independentlaboratory. In-housebackpressuretestingofa36"Tideflex ® CheckValve. 4CheckValves Independenttestingofa48"Tideflex ® CheckValve. TF1_ComparisonREVISED4.30.10:Layout 1 4/30/10 4:00 PM Page 7 CheckValves5 FiniteElementAnalysis(FEA) Fromtheoutside,Tideflex ® CheckValvesappeartobeasimple rubbervalvemanufacturedinaduckbillshape.However,foreach Tideflex ® CheckValvetherecanbehundredsoflayersofvarious naturalandsyntheticelastomersandfabric-reinforcedplies. Thisallowsustodesignfordrasticallydifferentcharacteristics suchasresilience,durometer,compressionsetresistance, tensilestrengthandelongation.EachTideflex ® CheckValve iscustomizedtomeetyourspecifichydraulicneeds. Tideflex ® Technologieshasconductedanextensiveamountof FiniteElementAnalysis(FEA)modelstoanalyzethestress,strain, forceanddeflectioncharacteristicsundermanyloadconditions. Modelingwasrunfordischargingandbackpressureconditions. Theseresultswereusedindevelopingdetailedfabrication protocolssothatTideflex ® CheckValveswillwithstandall ofthelong-termvariableloadconditions,whileproducing thedesiredhydrauliccharacteristics. HydraulicVariations Withtheextensiveamountofdatacollected,Tideflex ® Technologiesdevelopsmodelingprogramswhichallowusto selecttheoptimalcheckvalveforyouruniqueapplicationneeds. Tideflex ® CheckValvesarenot“onesizefitsall.” Thereareuptofiftydifferentvariationsofcheckvalveswithin eachnominalsize.Eachvariationhasitsownhydraulic characteristicsforheadloss,jetvelocity,effectivediameterand backpressurerating.Thisisachievedbychangingthegeometry andrelativestiffnessofthevalve. Tideflex ® CheckValvesareconstructedsimilartoatrucktire withmanytypesofelastomersandfabric-reinforcedplies.Each materialhasadifferentmechanicalproperty.Whencombined intoaunibodyconstructionthesematerialsproducespecific hydrauliccharacteristics. OnlyTideflex ® Technologieshasperformedextensivehydraulic testingandbackpressuretestingtocorrelatethespecific constructiondetailswiththehydraulicperformanceand backpressureratingofeachvalve. AFiniteElementAnalysismodelofaTideflex ® CheckValve. VariousconfigurationsofTideflex ® CheckValves andDiffuserNozzles. VariousconfigurationsofTideflex ® CheckValves showingdifferentbillthickness. THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! TF1_ComparisonREVISED4.30.10:Layout 1 5/18/10 9:36 AM Page 8

3. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge Still Ahead of the Curve! TheTideflex ® A dv A n TA ge APioneerintheCheckValveIndustry In1984,theUnitedStatesEnvironmentalProtectionAgency(EPA) commissionedTideflex ® Technologiestodevelopandtestanalternative toflapgatevalves.Intheirreport, DevelopmentandEvaluationofa Rubber“DuckBill”TideGate ,theEPAstates,“Increasingthereliability andperformanceoftidegateshasabeneficialimpactonthegeneral pollutionabatementprogramforthenation’swaterways.” Inresponse,theelastomer“duckbill”Tideflex ® CheckValvewasdeveloped toeliminatetheoperationalandmaintenanceproblemsassociatedwith flapgatecheckvalves,includingcorrosionofmechanicalparts,freezing openorshut,warpingandcloggingduetoentrappeddebris. TheEPArigorouslytestedtheTideflex ® CheckValvefortwoyears andfoundthatthevalveshowed,“Significantimprovementover flapgatevalvesintermsofleakageinflow,entrapmentofdebris, capabilitytoselfcleanandsusceptibilitytomarinefouling.” RichardField,UnitedStatesEPA,statedthefollowinginregardtothe developmentoftheTideflex ® CheckValve: “TidewaterintrusioniscostingtheUnitedStatesmulti-millions ofdollarsbecauseitiswaterthatreallydoesn’thavetobetreated thatintrudesintothesewersystemandtreatmentplants.Inthe longrun,therewillbealotofmoneysavedfortheminor investmentthatwemadehere.” Sinceitscreationin1984,yearsofresearchanddevelopment,testing andprovenperformancehavecombinedtomaketheTideflex ® CheckValve today’smostreliablevalveforbackflowprevention.Infact,thefirstcheck valvethatTideflex ® Technologiessoldin1984isstillinservicetoday. Currently,over600,000Tideflex ® CheckValvesaresolvinginflowand intrusionproblemsaroundtheworld. Twenty-sixyearslater,theoriginal54"Tideflex ® CheckValve(asshownabove)isstillinoperation. Problem TheEPAreport,statingthebenefitsof Tideflex ® CheckValves. Solution 2CheckValves TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 11:56 AM Page 5 TheTideflex ® Advantage TheTideflex ® CheckValveisarevolutionarydesignforbackflowprevention. Ourcheckvalvesofferlowcrackingpressuretoeliminatestandingwater. Theyalsohavelowheadlossandarenotaffectedbyrust,corrosionor lackoflubrication. Tideflex ® CheckValvesarecost-effectivebecausetheyrequireno maintenanceorrepairsandhavealonglifespan.Thevalvesoperate usinglinepressureandbackpressuretoopenandclose,sonooutside energysourceisrequired.Tideflex ® CheckValvesmakeexcellent replacementsforineffectivemetalflapgatevalvesbecausetheyhave nomovingpartsthatcancorrode,warporfreeze. Tideflex ® Technologies’25-plusyearsofprovenfieldoperation, researchanddevelopmentandcontinuedengineeringenhancements haveallcombinedtomakeourcheckvalvesthemostreliableinthe industrytoday.Ourcheckvalvesachievethetightestpossiblesealfor backflowapplications,particularlyatlowflowrates.Whenyouspecify apatentedTideflex ® CheckValveyouareguaranteedaprovenrecord ofmaintenance-freebackflowprevention. Thisdocumentisintendedtogiveourcustomersafirmunderstandingof thetechnicaldifferencesbetweencheckvalvesfromTideflex ® Technologies andcheckvalvesfromothermanufacturers.TheTideflex ® Advantage ensuresthatyoureceiveasuperiorcheckvalvethroughour: • RigorousEPATesting • IndependentHydraulicTesting • In-houseTesting • FiniteElementAnalysis(FEA) • HydraulicVariations • CurvedBillDesign • EccentricTF-1CheckValve • StrongerStructure • IncreaseinTF-1BillHeight • IncreaseinFlowCapacity • EccentricFlat-BottomDesign • ProperSpecifications ReversepressuresealstheCurvedBillofthe Tideflex ® CheckValvetopreventbackflow. TheTideflex ® CheckValveopenswith positivepressure. PRINCIPLEOFOPERATION ENGINEEREDFEATURES • NoMovingorMechanicalParts • 100%ElastomerConstruction • LowHeadloss • SensitiveEnoughtoOpenWith asLittleas1”ofWaterPressure • Custom-builttoYourFlow Specifications • Cost-effective,Reliable ReplacementforTraditional FlapGateValves • Silent,Non-slamming • Self-draining,Eliminates StandingWater THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! CheckValves3 TF1_ComparisonREVISED4.30.10:Layout 1 4/30/10 4:00 PM Page 6

4. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge Still Ahead of the Curve! TheTideflex ® A dv A n TA ge APioneerintheCheckValveIndustry In1984,theUnitedStatesEnvironmentalProtectionAgency(EPA) commissionedTideflex ® Technologiestodevelopandtestanalternative toflapgatevalves.Intheirreport, DevelopmentandEvaluationofa Rubber“DuckBill”TideGate ,theEPAstates,“Increasingthereliability andperformanceoftidegateshasabeneficialimpactonthegeneral pollutionabatementprogramforthenation’swaterways.” Inresponse,theelastomer“duckbill”Tideflex ® CheckValvewasdeveloped toeliminatetheoperationalandmaintenanceproblemsassociatedwith flapgatecheckvalves,includingcorrosionofmechanicalparts,freezing openorshut,warpingandcloggingduetoentrappeddebris. TheEPArigorouslytestedtheTideflex ® CheckValvefortwoyears andfoundthatthevalveshowed,“Significantimprovementover flapgatevalvesintermsofleakageinflow,entrapmentofdebris, capabilitytoselfcleanandsusceptibilitytomarinefouling.” RichardField,UnitedStatesEPA,statedthefollowinginregardtothe developmentoftheTideflex ® CheckValve: “TidewaterintrusioniscostingtheUnitedStatesmulti-millions ofdollarsbecauseitiswaterthatreallydoesn’thavetobetreated thatintrudesintothesewersystemandtreatmentplants.Inthe longrun,therewillbealotofmoneysavedfortheminor investmentthatwemadehere.” Sinceitscreationin1984,yearsofresearchanddevelopment,testing andprovenperformancehavecombinedtomaketheTideflex ® CheckValve today’smostreliablevalveforbackflowprevention.Infact,thefirstcheck valvethatTideflex ® Technologiessoldin1984isstillinservicetoday. Currently,over600,000Tideflex ® CheckValvesaresolvinginflowand intrusionproblemsaroundtheworld. Twenty-sixyearslater,theoriginal54"Tideflex ® CheckValve(asshownabove)isstillinoperation. Problem TheEPAreport,statingthebenefitsof Tideflex ® CheckValves. Solution 2CheckValves TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 11:56 AM Page 5 TheTideflex ® Advantage TheTideflex ® CheckValveisarevolutionarydesignforbackflowprevention. Ourcheckvalvesofferlowcrackingpressuretoeliminatestandingwater. Theyalsohavelowheadlossandarenotaffectedbyrust,corrosionor lackoflubrication. Tideflex ® CheckValvesarecost-effectivebecausetheyrequireno maintenanceorrepairsandhavealonglifespan.Thevalvesoperate usinglinepressureandbackpressuretoopenandclose,sonooutside energysourceisrequired.Tideflex ® CheckValvesmakeexcellent replacementsforineffectivemetalflapgatevalvesbecausetheyhave nomovingpartsthatcancorrode,warporfreeze. Tideflex ® Technologies’25-plusyearsofprovenfieldoperation, researchanddevelopmentandcontinuedengineeringenhancements haveallcombinedtomakeourcheckvalvesthemostreliableinthe industrytoday.Ourcheckvalvesachievethetightestpossiblesealfor backflowapplications,particularlyatlowflowrates.Whenyouspecify apatentedTideflex ® CheckValveyouareguaranteedaprovenrecord ofmaintenance-freebackflowprevention. Thisdocumentisintendedtogiveourcustomersafirmunderstandingof thetechnicaldifferencesbetweencheckvalvesfromTideflex ® Technologies andcheckvalvesfromothermanufacturers.TheTideflex ® Advantage ensuresthatyoureceiveasuperiorcheckvalvethroughour: • RigorousEPATesting • IndependentHydraulicTesting • In-houseTesting • FiniteElementAnalysis(FEA) • HydraulicVariations • CurvedBillDesign • EccentricTF-1CheckValve • StrongerStructure • IncreaseinTF-1BillHeight • IncreaseinFlowCapacity • EccentricFlat-BottomDesign • ProperSpecifications ReversepressuresealstheCurvedBillofthe Tideflex ® CheckValvetopreventbackflow. TheTideflex ® CheckValveopenswith positivepressure. PRINCIPLEOFOPERATION ENGINEEREDFEATURES • NoMovingorMechanicalParts • 100%ElastomerConstruction • LowHeadloss • SensitiveEnoughtoOpenWith asLittleas1”ofWaterPressure • Custom-builttoYourFlow Specifications • Cost-effective,Reliable ReplacementforTraditional FlapGateValves • Silent,Non-slamming • Self-draining,Eliminates StandingWater THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! CheckValves3 TF1_ComparisonREVISED4.30.10:Layout 1 4/30/10 4:00 PM Page 6

15. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge Still Ahead of the Curve! e nsuring A ccu r AT e spe cific AT ion s 14CheckValves Stiffness Picturedontherightaretwo6"checkvalvesmade forthesameoperatingconditions.Thevalveontheleft wasmanufacturedbyTideflex ® Technologies.Thevalve ontherightwasmadebyanothervalvemanufacturer. Thesecheckvalvesweresuppliedforthesamehydraulic conditions.Testsshowedthattheothermanufacturer’s valvehadthreetimestheheadlossasthatofthevalve manufacturedbyTideflex ® Technologies. Mandrels Tideflex ® Technologiesownsmandrelsfrom1/2"-96". Thisallowsustobuildfull-sizedvalveseverytime.Other valvemanufacturersconstructundersizedduckbillcheck valvesduetolimitedtooling.Theywillthenpassthesmaller duckbillcheckvalveoffasalargersizedvalvebysimply providingastep-upcuffadapter.Thishasdetrimental effectsonthesystemhydraulicsandperformancebecause undersizedvalvesputadditionalheadlossonthesystem. A20"checkvalvewitha30"cuff,builtbyanothercheckvalve manufacturer.Thiswaspassedoffasa30"checkvalve. ATideflex ® CheckValve(left)nexttoa competitor’scheckvalve(right). TF1_ComparisonREVISED5.21.10:Layout 1 5/21/10 1:31 PM Page 17 CheckValves15 UnderstandtheDifference Tideflex ® CheckValvesaredesignedandmanufactured inaccordancewithyourhydraulicrequirements.Based onourextensivetestingandexperience,Tideflex ® Technologiesprovidesfull-sizedvalvesthatensure thegreatestflowcapacityatthelowestheadloss. Becauseofinsufficienttooling,desiretoreducetheircost andtogetaroundyourspecifications;othermanufacturers arewillingtosupplyundersizedvalveswithnoregardto yourhydraulicrequirements. Thisresultsinincreasedheadloss,decreasedflow capacity,raisedinvertelevation,pondingwaterinthe pipe,entrapmentofsedimentanddebrisandvalves thatarepronetoinversion. THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! TheSignificanceofWritingaProperSpecification Makesureyougetwhatyouareentitledto.Thisdocument compilesTideflex ® Technologies’25-plusyearsofleadership andexperienceinthecheckvalveindustry.Ourpurposeisto clearlyexplainthetechnicaladvantagesofTideflex ® Technologies’ CheckValves.Allofourcheckvalveshavebeenindependently testedandfieldvalidated.Wealsocontinuouslyconductresearch anddevelopmentinordertointroduceimprovementstoour checkvalves. Ourobjectiveistoextendcheckvalvelifewhileimproving hydraulicperformance.Mostimportantly,weminimize headlossacrosscheckvalves. Theinformationpresentedinthisdocumentismeanttoprovide technicaljustificationastowhyitisimportanttofollowour leadandwriteaproperspecification. (13)90"Tideflex ® CheckValvesinstalledintheBuenosAires,Argentina,drainagesystem. TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 10:13 AM Page 18

16. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge Still Ahead of the Curve! e nsuring A ccu r AT e spe cific AT ion s 14CheckValves Stiffness Picturedontherightaretwo6"checkvalvesmade forthesameoperatingconditions.Thevalveontheleft wasmanufacturedbyTideflex ® Technologies.Thevalve ontherightwasmadebyanothervalvemanufacturer. Thesecheckvalvesweresuppliedforthesamehydraulic conditions.Testsshowedthattheothermanufacturer’s valvehadthreetimestheheadlossasthatofthevalve manufacturedbyTideflex ® Technologies. Mandrels Tideflex ® Technologiesownsmandrelsfrom1/2"-96". Thisallowsustobuildfull-sizedvalveseverytime.Other valvemanufacturersconstructundersizedduckbillcheck valvesduetolimitedtooling.Theywillthenpassthesmaller duckbillcheckvalveoffasalargersizedvalvebysimply providingastep-upcuffadapter.Thishasdetrimental effectsonthesystemhydraulicsandperformancebecause undersizedvalvesputadditionalheadlossonthesystem. A20"checkvalvewitha30"cuff,builtbyanothercheckvalve manufacturer.Thiswaspassedoffasa30"checkvalve. ATideflex ® CheckValve(left)nexttoa competitor’scheckvalve(right). TF1_ComparisonREVISED5.21.10:Layout 1 5/21/10 1:31 PM Page 17 CheckValves15 UnderstandtheDifference Tideflex ® CheckValvesaredesignedandmanufactured inaccordancewithyourhydraulicrequirements.Based onourextensivetestingandexperience,Tideflex ® Technologiesprovidesfull-sizedvalvesthatensure thegreatestflowcapacityatthelowestheadloss. Becauseofinsufficienttooling,desiretoreducetheircost andtogetaroundyourspecifications;othermanufacturers arewillingtosupplyundersizedvalveswithnoregardto yourhydraulicrequirements. Thisresultsinincreasedheadloss,decreasedflow capacity,raisedinvertelevation,pondingwaterinthe pipe,entrapmentofsedimentanddebrisandvalves thatarepronetoinversion. THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! TheSignificanceofWritingaProperSpecification Makesureyougetwhatyouareentitledto.Thisdocument compilesTideflex ® Technologies’25-plusyearsofleadership andexperienceinthecheckvalveindustry.Ourpurposeisto clearlyexplainthetechnicaladvantagesofTideflex ® Technologies’ CheckValves.Allofourcheckvalveshavebeenindependently testedandfieldvalidated.Wealsocontinuouslyconductresearch anddevelopmentinordertointroduceimprovementstoour checkvalves. Ourobjectiveistoextendcheckvalvelifewhileimproving hydraulicperformance.Mostimportantly,weminimize headlossacrosscheckvalves. Theinformationpresentedinthisdocumentismeanttoprovide technicaljustificationastowhyitisimportanttofollowour leadandwriteaproperspecification. (13)90"Tideflex ® CheckValvesinstalledintheBuenosAires,Argentina,drainagesystem. TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 10:13 AM Page 18

11. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge Still Ahead of the Curve! longerlife, improved perform A nce V A L V E S I Z E T F - 2 H E I G H T T F - 1 H E I G H T H E I G H T D I F F E R E N C E T F - 1 H E A D L O S S R E D U C T I O N 12" 20" 23" 3" 32% 24" 39" 43" 4" 21% 36" 63" 70" 7" 23% 54" 80" 90" 10" 26% 90" 124" 145" 21" 36% 10 Check Valves Increased TF-1 Bill Height Reduces Headloss With a maximized Bill Height that increases the effective open area, headloss in the Eccentric TF-1 Check Valve is significantly reduced. This unique feature improves flow capacity. To properly specify an Eccentric TF-1 Check Valve you must state the minimum valve height requirement. Efficiencies are gained and costs are reduced in gravity outfalls and pumped applications. These savings are derived from the larger effective area of the TF-1 and its increased Bill Height. Systems most impacted are: • CSO/SSO Systems • Flow Equalization • Stormwater Outfall • Retention Ponds • Wetlands • Levees • Highway Run-off • Site Drainage • Effluent Discharge Ecccentric TF-1 Check Valves have a greater bill height which increases the effective open area and reduces headloss. TF1_ComparisonREVISED5.21.10:Layout 1 5/21/10 1:30 PM Page 13 IncreasesFlowCapacity TheeccentricTF-1CheckValvewasdevelopedwithaflat bottomtominimizetheamountofbottomclearancerequired belowthepipeinvert.Thisallowsforthevalveandpipeline tobelowered,whichmaximizesdrivinghead.Thisresultsin fasterdrainage,whichisespeciallyimportantinlow-lying areasthathavelimitedheadavailable. Instructures,theeccentricTF-1CheckValvedoesnotrequire asmuchclearancebelowthepipeinvertwhichminimizesthe amountofdebris,sandandsedimentthatcangettrapped. CheckValves11 EccentricTF-1CheckValvesareidealforlow-lyingareas. V A L V E S I Z E T F - 2 H E I G H T T F - 1 H E I G H T T F - 1 I N C R E A S E D D R I V I N G H E A D 12"20"23"4" 24"39"43"7.5" 36" 63" 70" 13.5" 48"80"95"16" 90" 124" 145" 17" The Eccentric TF-1 produces a verysmall sump because of its low bottom clearance. The amount of sand and sediment thatcan get trapped in the vault is minimized because normalflow velocities will scour the sump of a TF-1. The increased driving headof a TF-1 Check Valve improves flow capacity. Eccentric TF-1 Check Valves allow for a lower pipe invertelevation. THE TIDEFLEX ® ADVANTAGE Still Ahead of the Curve! TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 9:58 AM Page 14

12. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge Still Ahead of the Curve! longerlife, improved perform A nce V A L V E S I Z E T F - 2 H E I G H T T F - 1 H E I G H T H E I G H T D I F F E R E N C E T F - 1 H E A D L O S S R E D U C T I O N 12" 20" 23" 3" 32% 24" 39" 43" 4" 21% 36" 63" 70" 7" 23% 54" 80" 90" 10" 26% 90" 124" 145" 21" 36% 10 Check Valves Increased TF-1 Bill Height Reduces Headloss With a maximized Bill Height that increases the effective open area, headloss in the Eccentric TF-1 Check Valve is significantly reduced. This unique feature improves flow capacity. Toproperly specify an Eccentric TF-1 Check Valve you must state the minimum valve height requirement. Efficiencies are gained and costs are reduced in gravity outfalls and pumped applications. These savings are derived from the larger effective area of the TF-1 and its increased Bill Height. Systems most impacted are: • CSO/SSO Systems • Flow Equalization • Stormwater Outfall • Retention Ponds • Wetlands • Levees • Highway Run-off • Site Drainage • Effluent Discharge Ecccentric TF-1 Check Valves have a greater bill height which increases the effectiveopen area and reduces headloss. TF1_ComparisonREVISED5.21.10:Layout 1 5/21/10 1:30 PM Page 13 IncreasesFlowCapacity TheeccentricTF-1CheckValvewasdevelopedwithaflat bottomtominimizetheamountofbottomclearancerequired belowthepipeinvert.Thisallowsforthevalveandpipeline tobelowered,whichmaximizesdrivinghead.Thisresultsin fasterdrainage,whichisespeciallyimportantinlow-lying areasthathavelimitedheadavailable. Instructures,theeccentricTF-1CheckValvedoesnotrequire asmuchclearancebelowthepipeinvertwhichminimizesthe amountofdebris,sandandsedimentthatcangettrapped. CheckValves11 EccentricTF-1CheckValvesareidealforlow-lyingareas. V A L V E S I Z E T F - 2 H E I G H T T F - 1 H E I G H T T F - 1 I N C R E A S E D D R I V I N G H E A D 12"20"23"4" 24"39"43"7.5" 36" 63" 70" 13.5" 48"80"95"16" 90" 124" 145" 17" The Eccentric TF-1 produces a very small sump because of its low bottom clearance. The amount of sand and sediment that can get trapped in the vault is minimized because normal flow velocities will scour the sump of a TF-1. The increased driving head of a TF-1 Check Valve improves flow capacity. Eccentric TF-1 Check Valves allow for a lower pipe invert elevation. THE TIDEFLEX ® ADVANTAGE Still Ahead of the Curve! TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 9:58 AM Page 14

7. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge Still Ahead of the Curve! A he A dof T he curve 6CheckValves CurvedBillDoesNotHinderAbilitytoOpen TheCurvedBilldesignofTideflex ® Technologies’CheckValves willnothinderoreffecttheabilityofthevalvetoopenandclose, especiallyinareaswherethereissandorsiltpresent. RecentlyamajorRegionalCouncilinQueensland,Australia,installed threedifferentsizedCurvedBillTideflex ® TF-1CheckValvesalong theircoastline.Areasalongthiscoastlinedealwithlow-lyingland, tidalinlets,sanddrifts,hightidesandcyclonicrainfall.Thismeans that stormwaterdrainageoutletsareoftensubmergedorburied, makingitdifficulttoensurestormwaterdrainageanddischarge totheocean. TheCouncilsaidthatwhilethereislittlethatcanbedonewhenhigh tidesareoccurringtoallowstormwatertodissipate(apartfrom detentionbasins),Tideflex ® CheckValvescanbeusedtostopsalt waterfrominundatinglowlyingareas.TheCouncilalsostatedthe followinginregardtotheTideflex ® CheckValve: “Theyalsodonotgetblocked,allowingstormwatertobeusedto clearawaysandwhentheoutletisburied.Thereareanumberof problemswithmanytraditionalstormwateroutletswhichinclude beingburiedbysandwithtidaldriftcausingstormwater flooding,allowingsaltwaterintrusionintothestormwater drainagesystemandinundatinglowlyingland.Thisresults inimmediateandlongtermdamage.” Tideflex ® CheckValvescanwithstandoverthreemetresofinward pr essureanddonotallowsaltwatertoenter. TheCurvedBilldoes notrestrictvalveoperation. ATideflex ® CheckValvecanbeburied inthesandandwillallowstormwatertodischargebyusingthe stormwaterpressuretocleanawaythesand.Thevalvewillflow withaslittleasfiftymillimetresofdifferentialwaterinthepipe. TheCouncilalsostatedthefollowingabouttherecentlyinstalled Tideflex ® CheckValves: “Withthemoderaterainfallreceivedrecently,wewitnessed them [CurvedBillTideflex ® TF-1CheckValves]workingto removethesandsurroundingtheburiedvalvestoallowthe watertodischargetotheocean.Previouslythishastakena crewandbackhoeanumberofhourstofreethewatereach timeithaseitherrainedorbeenburied.Thisisjustanother exampleofworkingsmarterandusingbestpractice.” ViewsoftheTF-1CheckValvesinstalledalongthecoastline. NotethattheCurvedBilldesignoftheCheckValvesdoesnot hinderthevalve’sabilitytoopenandflowinthesand. TF1_ComparisonREVISED4.30.10:Layout 1 4/30/10 4:00 PM Page 9 CheckValves7 CurvedBillDesign AspartofTideflex ® Technologies’commitmenttocontinuous testinganddesignimprovement,ourcheckvalvesnowfeature apatentedCurvedBillasstandardonSeriesTF-1/35-1andas anoptiononourothercheckvalveproducts. TheCurvedBillismoreresilient.Thisreducesheadloss acrossthevalveandincreasessealing.Asaresult,the CurvedBillreturnstoaclosedpositionmorenaturally whencomparedtotheoriginalStraightBillTideflex ® CheckValvedesign. The CurvedBilldesignincreasesthesealingareaby50%.This allowsthevalvetoformatightersealarounddebrisandsolids typicallyfoundinstormwaterandeffluentdischarge,airportand highwayrunoff,CSO/SSOsystems,oceanoutfalls,floodcontrol systemsandpumpingstations. TheCurvedBillenhancementisself-draininganddoesnot increaseheadloss. Infact,headlossissignificantlylower withaCurvedBill. TESTIMONIALFROMTHEFIELD... “CityofMonongahelahasworkedwithRedValveCompanyfor thepast12yearsidentifyingkeylocationsinoursystemwhere absolutebackflowpreventionisrequired.Manyofouroutfall linesareatnormalpoolelevationsorlower.TheTideflex ® CheckValvesareusedspecificallytopreventriverwater fromgettingintoourcombinedseweroverflowsystem.By mitigatinginflowandinfiltration,weareabletopreventback flow,eliminatehavingtotreatcleanriverwater,andwehave expandedthecapacityofourcollectionsystem. Recently,CityofMonongahelahasconvertedfromusingthe originalTideflex ® CheckValve(TF-2)totheTF-1newEccentric Stylewiththecurvedbill.Wehavefoundthattheeccentric valveshavelowerheadlossandthecurvedbillprovidesamore effectivesealbecauseofitssignificantlylargersealingarea. Tideflex ® CheckValveshavebecomeanintegralpartofour regionalconveyanceprojectsandhavesavedusmoneywith reducedmaintenanceandoperationalcosts.” EdWhite PlantSuperintendent CityofMonongahelaSewageTreatmentPlant TheTF-1isself-draininganddoesnotincreaseheadloss. TheCurvedBilloftheTF-1sealstightlyarounddebris. THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! TF1_ComparisonREVISED5.24.10:Layout 1 5/24/10 4:13 PM Page 10

8. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge Still Ahead of the Curve! A he A dof T he curve 6CheckValves CurvedBillDoesNotHinderAbilitytoOpen TheCurvedBilldesignofTideflex ® Technologies’CheckValves willnothinderoreffecttheabilityofthevalvetoopenandclose, especiallyinareaswherethereissandorsiltpresent. RecentlyamajorRegionalCouncilinQueensland,Australia,installed threedifferentsizedCurvedBillTideflex ® TF-1CheckValvesalong theircoastline.Areasalongthiscoastlinedealwithlow-lyingland, tidalinlets,sanddrifts,hightidesandcyclonicrainfall.Thismeans that stormwaterdrainageoutletsareoftensubmergedorburied, makingitdifficulttoensurestormwaterdrainageanddischarge totheocean. TheCouncilsaidthatwhilethereislittlethatcanbedonewhenhigh tidesareoccurringtoallowstormwatertodissipate(apartfrom detentionbasins),Tideflex ® CheckValvescanbeusedtostopsalt waterfrominundatinglowlyingareas.TheCouncilalsostatedthe followinginregardtotheTideflex ® CheckValve: “Theyalsodonotgetblocked,allowingstormwatertobeusedto clearawaysandwhentheoutletisburied.Thereareanumberof problemswithmanytraditionalstormwateroutletswhichinclude beingburiedbysandwithtidaldriftcausingstormwater flooding,allowingsaltwaterintrusionintothestormwater drainagesystemandinundatinglowlyingland.Thisresults inimmediateandlongtermdamage.” Tideflex ® CheckValvescanwithstandoverthreemetresofinward pr essureanddonotallowsaltwatertoenter. TheCurvedBilldoes notrestrictvalveoperation. ATideflex ® CheckValvecanbeburied inthesandandwillallowstormwatertodischargebyusingthe stormwaterpressuretocleanawaythesand.Thevalvewillflow withaslittleasfiftymillimetresofdifferentialwaterinthepipe. TheCouncilalsostatedthefollowingabouttherecentlyinstalled Tideflex ® CheckValves: “Withthemoderaterainfallreceivedrecently,wewitnessed them [CurvedBillTideflex ® TF-1CheckValves]workingto removethesandsurroundingtheburiedvalvestoallowthe watertodischargetotheocean.Previouslythishastakena crewandbackhoeanumberofhourstofreethewatereach timeithaseitherrainedorbeenburied.Thisisjustanother exampleofworkingsmarterandusingbestpractice.” ViewsoftheTF-1CheckValvesinstalledalongthecoastline. NotethattheCurvedBilldesignoftheCheckValvesdoesnot hinderthevalve’sabilitytoopenandflowinthesand. TF1_ComparisonREVISED4.30.10:Layout 1 4/30/10 4:00 PM Page 9 CheckValves7 CurvedBillDesign AspartofTideflex ® Technologies’commitmenttocontinuous testinganddesignimprovement,ourcheckvalvesnowfeature apatentedCurvedBillasstandardonSeriesTF-1/35-1andas anoptiononourothercheckvalveproducts. TheCurvedBillismoreresilient.Thisreducesheadloss acrossthevalveandincreasessealing.Asaresult,the CurvedBillreturnstoaclosedpositionmorenaturally whencomparedtotheoriginalStraightBillTideflex ® CheckValvedesign. The CurvedBilldesignincreasesthesealingareaby50%.This allowsthevalvetoformatightersealarounddebrisandsolids typicallyfoundinstormwaterandeffluentdischarge,airportand highwayrunoff,CSO/SSOsystems,oceanoutfalls,floodcontrol systemsandpumpingstations. TheCurvedBillenhancementisself-draininganddoesnot increaseheadloss. Infact,headlossissignificantlylower withaCurvedBill. TESTIMONIALFROMTHEFIELD... “CityofMonongahelahasworkedwithRedValveCompanyfor thepast12yearsidentifyingkeylocationsinoursystemwhere absolutebackflowpreventionisrequired.Manyofouroutfall linesareatnormalpoolelevationsorlower.TheTideflex ® CheckValvesareusedspecificallytopreventriverwater fromgettingintoourcombinedseweroverflowsystem.By mitigatinginflowandinfiltration,weareabletopreventback flow,eliminatehavingtotreatcleanriverwater,andwehave expandedthecapacityofourcollectionsystem. Recently,CityofMonongahelahasconvertedfromusingthe originalTideflex ® CheckValve(TF-2)totheTF-1newEccentric Stylewiththecurvedbill.Wehavefoundthattheeccentric valveshavelowerheadlossandthecurvedbillprovidesamore effectivesealbecauseofitssignificantlylargersealingarea. Tideflex ® CheckValveshavebecomeanintegralpartofour regionalconveyanceprojectsandhavesavedusmoneywith reducedmaintenanceandoperationalcosts.” EdWhite PlantSuperintendent CityofMonongahelaSewageTreatmentPlant TheTF-1isself-draininganddoesnotincreaseheadloss. TheCurvedBilloftheTF-1sealstightlyarounddebris. THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! TF1_ComparisonREVISED5.24.10:Layout 1 5/24/10 4:13 PM Page 10

17. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge Still Ahead of the Curve! Tideflex ® CheckValveDesignDataSheet I.GeneralInformation II.FlowCondition III.PipeDetails IV.CurvedBillOption V.InstallationOptions Stormwater/DrainageSewageCSO/SSOOther: Pumped GravityFlow LinePressure (RequiredforPumpedSystems) -Minimum: Maximum: feetmeterspsibar FlowRate- Minimum: Maximum: gpmlps MaximumBackpressure (CalculatedtoPipeInvertLevel) : feetmeterspsibar BottomClearance (DistanceBeneathPipeInvert) : inchesmm ProjectName: AdvertisesOn: ProjectLocation: BidsOn: EndUser’sCompanyName: ConsultingEngineerFirm: Contact: Contact: Email: Email: Address: Address: Address: Address: City: State: City: State: Zip: County: Zip: County: Phone: Fax: Phone: Fax: WaterLevel(Maximum) LinePressure PipeInvertLevel BottomClearance Backpressure(Maximum) Inchesmm NominalPipeSize: PipeO.D.: PipeI.D.: PipeMaterial: YesNo CurvedBillisStandardon TF-1andSeries35-1 CheckValvesSize 18”andLarger Slip-onaPipe:TF-1 TF-2 FlangeInstallation:Series35-1Series3539/39F Drilling: ANSI125/150#PN_____________ Slip-insideaPipe:Series37 (Flanged) Series37G (Insert) WallThimbleRequired: YesNo (IfYes,ProvideDetailDrawingofStructure/Headwall) Comments: CheckValves17 THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! TF1_ComparisonREVISED5.21.10:Layout 1 5/21/10 1:32 PM Page 20 16CheckValves SeriesTF-1CheckValveSpecification PART1:GENERAL 1.01SUBMITTALS A.Submitproductliteraturethatincludesinformation ontheperformanceandoperationofthevalve,materials ofconstruction,dimensionsandweights,elastomer characteristics,flowdata,headlossdata,and pressureratings. B.Uponrequest,provideshopdrawingsthatclearly identifythevalvedimensions. C.Uponrequest,manufacturershallprovideinstallation andreferencelistsforexistingvalvesofsimilarsizeand typetotheprojectscope. 1.02QUALITYASSURANCE A.Suppliershallhaveatleastfifteen(15)yearsexperience inthemanufactureof“duckbill”styleelastomericvalves. B.Manufacturershallhaveconductedindependenthydraulic testingtodetermineheadlossandjetvelocity characteristicsonaminimumofeightsizesofduckbill valvesrangingfrom2”through48”.Thetestingmust includemultipleconstructions(stiffness)with ineach sizeandmusthavebeenconductedforfreedischarge (dischargetoatmosphere)andsubmergedconditions. C.Manufacturershallhaveconductedanindependent hydraulictestwheremultiplevalves(atleastfour)ofthe samesizeandconstruction(stiffness)weretestedto validatethesubmittedheadlosscharacteristicsandto provetherepeatabilityofthemanufacturingprocessto producethesamehydrauliccharacteristics. D.Manufacturertohaveconducte dFiniteElementAnalysis (FEA)onvariousduckbillvalvestodeterminedeflection, stressandstraincharacteristicsundervariousload conditions.Modelingmusthavebeendoneforflowing conditions(positivedifferentialpressure)andreverse differentialpressure. E.Valves24”andlargermustincorporateametallicsupport completelyencapsulatedinthewallthicknessatthetop portionofthevalvetoassistinsupportingtheweight ofthevalve. F.Thebills litoftheduckbillvalvemustbeatleast 1.57timesthenominalpipediameter. PART2:PRODUCTS 2.01“DUCKBILL”ELASTOMERICCHECKVALVE A.CheckValvesaretobeallrubberoftheflowoperatedchecktype withaslip-onconnection.TheCheckValveisdesignedtoslipover thespecifiedpipeoutsidediameterandattachedbymeansofvendor furnishedstainlesssteelclamps.Theportareashallcontourdown toaduckbill,whichshallallowpassageofflowinonedirection whilep reventingreverseflow.Thevalveshallbeonepiecerubber constructionwithnylonreinforcement.Theduckbillshallbeoffsetso thatthebottomlineofthevalveisflat,keepingtheinvertofthepipe parallelwiththeinvertofthevalve.Thetopofthevalveshallriseto formtheduckbillshape.Thebillportionshallbethinnerandmore flexiblethanthevalvebodyandformedintoacurveof180°. B.Manufacturermusthaveavailableflowtestdatafromanaccredited hydrau licslaboratorytoconfirmpressuredropdata.Companyname, plantlocation,valvesizeandserialnumbershallbebondedtothe checkvalve. 2.02FUNCTION A.Whenlinepressureinsidethevalveexceedsthebackpressure outsidethevalve,thelinepressureforcesthebillofthevalveopen, allowingflowtopass.Whenbackpressureexceedsthelinepressure, thebillofthevalveisforcedclosed.Theflatbottomallowsthevalve tobeinstalledwhereminimalbottomclearanc eexists. 2.03MANUFACTURER A.AllvalvesshallbeoftheSeriesTF-1asmanufacturedby Tideflex ® Technologies,Carnegie,PA15106.Allvalvesshall bemanufacturedintheU.S.A. PART3:EXECUTION 3.01INSTALLATION A.Valveshallbeinstalledinaccordancewithmanufacturer’swritten InstallationandOperationManualandapprovedsubmittals. 3.02MANUFACTURER’SCUSTOMERSERVICE A.Manufacturer’sauthorizedrepresentativeshallbeavailablefor customerserviceduringinstallationandstart-up,andtotrain personnelintheoperation,maintenanceandtroubleshooting ofthevalve. B.Manufacturershallalsomakecustomerserviceavailabledirectly fromthefactoryinadditiontoauthorizedrepresentativesfor assistanceduringinstallationandstart-up,andtotrainpersonnel intheoperation,maintenanceandtroubleshootingofthevalve. TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 10:14 AM Page 19

18. p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com p: 412.279.0044 • f: 412.279.7878 • www.tideflex.com The Tideflex ® Adv A n TA ge Still Ahead of the Curve! Tideflex ® CheckValveDesignDataSheet I.GeneralInformation II.FlowCondition III.PipeDetails IV.CurvedBillOption V.InstallationOptions Stormwater/DrainageSewageCSO/SSOOther: Pumped GravityFlow LinePressure (RequiredforPumpedSystems) -Minimum: Maximum: feetmeterspsibar FlowRate- Minimum: Maximum: gpmlps MaximumBackpressure (CalculatedtoPipeInvertLevel) : feetmeterspsibar BottomClearance (DistanceBeneathPipeInvert) : inchesmm ProjectName: AdvertisesOn: ProjectLocation: BidsOn: EndUser’sCompanyName: ConsultingEngineerFirm: Contact: Contact: Email: Email: Address: Address: Address: Address: City: State: City: State: Zip: County: Zip: County: Phone: Fax: Phone: Fax: WaterLevel(Maximum) LinePressure PipeInvertLevel BottomClearance Backpressure(Maximum) Inchesmm NominalPipeSize: PipeO.D.: PipeI.D.: PipeMaterial: YesNo CurvedBillisStandardon TF-1andSeries35-1 CheckValvesSize 18”andLarger Slip-onaPipe:TF-1 TF-2 FlangeInstallation:Series35-1Series3539/39F Drilling: ANSI125/150#PN_____________ Slip-insideaPipe:Series37 (Flanged) Series37G (Insert) WallThimbleRequired: YesNo (IfYes,ProvideDetailDrawingofStructure/Headwall) Comments: CheckValves17 THETIDEFLEX ® ADVANTAGE StillAheadoftheCurve! TF1_ComparisonREVISED5.21.10:Layout 1 5/21/10 1:32 PM Page 20 16CheckValves SeriesTF-1CheckValveSpecification PART1:GENERAL 1.01SUBMITTALS A.Submitproductliteraturethatincludesinformation ontheperformanceandoperationofthevalve,materials ofconstruction,dimensionsandweights,elastomer characteristics,flowdata,headlossdata,and pressureratings. B.Uponrequest,provideshopdrawingsthatclearly identifythevalvedimensions. C.Uponrequest,manufacturershallprovideinstallation andreferencelistsforexistingvalvesofsimilarsizeand typetotheprojectscope. 1.02QUALITYASSURANCE A.Suppliershallhaveatleastfifteen(15)yearsexperience inthemanufactureof“duckbill”styleelastomericvalves. B.Manufacturershallhaveconductedindependenthydraulic testingtodetermineheadlossandjetvelocity characteristicsonaminimumofeightsizesofduckbill valvesrangingfrom2”through48”.Thetestingmust includemultipleconstructions(stiffness)with ineach sizeandmusthavebeenconductedforfreedischarge (dischargetoatmosphere)andsubmergedconditions. C.Manufacturershallhaveconductedanindependent hydraulictestwheremultiplevalves(atleastfour)ofthe samesizeandconstruction(stiffness)weretestedto validatethesubmittedheadlosscharacteristicsandto provetherepeatabilityofthemanufacturingprocessto producethesamehydrauliccharacteristics. D.Manufacturertohaveconducte dFiniteElementAnalysis (FEA)onvariousduckbillvalvestodeterminedeflection, stressandstraincharacteristicsundervariousload conditions.Modelingmusthavebeendoneforflowing conditions(positivedifferentialpressure)andreverse differentialpressure. E.Valves24”andlargermustincorporateametallicsupport completelyencapsulatedinthewallthicknessatthetop portionofthevalvetoassistinsupportingtheweight ofthevalve. F.Thebills litoftheduckbillvalvemustbeatleast 1.57timesthenominalpipediameter. PART2:PRODUCTS 2.01“DUCKBILL”ELASTOMERICCHECKVALVE A.CheckValvesaretobeallrubberoftheflowoperatedchecktype withaslip-onconnection.TheCheckValveisdesignedtoslipover thespecifiedpipeoutsidediameterandattachedbymeansofvendor furnishedstainlesssteelclamps.Theportareashallcontourdown toaduckbill,whichshallallowpassageofflowinonedirection whilep reventingreverseflow.Thevalveshallbeonepiecerubber constructionwithnylonreinforcement.Theduckbillshallbeoffsetso thatthebottomlineofthevalveisflat,keepingtheinvertofthepipe parallelwiththeinvertofthevalve.Thetopofthevalveshallriseto formtheduckbillshape.Thebillportionshallbethinnerandmore flexiblethanthevalvebodyandformedintoacurveof180°. B.Manufacturermusthaveavailableflowtestdatafromanaccredited hydrau licslaboratorytoconfirmpressuredropdata.Companyname, plantlocation,valvesizeandserialnumbershallbebondedtothe checkvalve. 2.02FUNCTION A.Whenlinepressureinsidethevalveexceedsthebackpressure outsidethevalve,thelinepressureforcesthebillofthevalveopen, allowingflowtopass.Whenbackpressureexceedsthelinepressure, thebillofthevalveisforcedclosed.Theflatbottomallowsthevalve tobeinstalledwhereminimalbottomclearanc eexists. 2.03MANUFACTURER A.AllvalvesshallbeoftheSeriesTF-1asmanufacturedby Tideflex ® Technologies,Carnegie,PA15106.Allvalvesshall bemanufacturedintheU.S.A. PART3:EXECUTION 3.01INSTALLATION A.Valveshallbeinstalledinaccordancewithmanufacturer’swritten InstallationandOperationManualandapprovedsubmittals. 3.02MANUFACTURER’SCUSTOMERSERVICE A.Manufacturer’sauthorizedrepresentativeshallbeavailablefor customerserviceduringinstallationandstart-up,andtotrain personnelintheoperation,maintenanceandtroubleshooting ofthevalve. B.Manufacturershallalsomakecustomerserviceavailabledirectly fromthefactoryinadditiontoauthorizedrepresentativesfor assistanceduringinstallationandstart-up,andtotrainpersonnel intheoperation,maintenanceandtroubleshootingofthevalve. TF1_ComparisonREVISED5.18.10:Layout 1 5/18/10 10:14 AM Page 19

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