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BULLETINJULY 2020300.00-1APCO ASUCOMBINATION AIR VALVE- Design- Operation- Performancewww.dezurik.com

Innovative Air Valve TechnologyThe APCO ASU Combination Air Valve introducesan innovative concept in air valve technology.Proven with extensive field experience on toughapplications, the ASU valve has demonstratedimproved performance, reduced maintenanceand lower cost for overall reliability on clean fluidsor sewage and dirty service applications.The APCO ASU Combination Air Valve is singlebody combination valve available in sizes 1-6" asstandard. Larger sizes on application.Unique, Multi-Stage OperationThe unique venting design provides variedand predictable air flow over a wide range ofair release and air/vacuum conditions. A largediameter Air/Vacuum Disc provides high volumeair flow for rapid venting during pipeline fillingand allows high volumes of air to enter thepipeline during draining. During normal pipelineflow conditions, the dual-range air releasedesign prevents air build up and resultant flowrestrictions under changing conditions andthrough the full flow range.Universal Valve Design, WideOperating Range & Low PressureSealing Down to 2 psiVenting design and technology allows applicationon an almost universal range of flow conditionswith effective sealing and operation available intwo pressure ranges: 2 psi to 150 psi or 2 psi to300 psi for high pressure service.Meets AWWA C-512Performance SpecificationsThe ASU Combination Air Valve meetsperformance requirements of the AWWAC-512 standard “Air Valves for Water &Wastewater Service.”All Stainless Steel ConstructionThe ASU Combination Air Valve is ideally suited tocorrosive conditions with a 316 Stainless Steel bodyand float. Internal parts are corrosion resistant highstrength stainless steel.Light Weight, Low Profile Body DesignThe compact design of the ASU Combination Air Valveallows installation in piping systems with limited spaceand in vaults with low ceiling heights. FabricatedASU construction meets full pressure class ratingsand minimizes weight for ease of installation and forretrofit replacement of other air valves.Matched Inlet & Outlet SizesThe equal size inlet and outlet area of the ASU valvefully meets the defined requirement of AWWA C-512providing high capacity and a broad operating range.The ASU Combination air valve is available withflanged or threaded NPT inlet connections.2 2020 DeZURIK, Inc.www.dezurik.com

Float Shape Designed for StabilityThe unique float shape reduces the ballistic effect ofhigh speed liquid flow into the valve, further addingto float stability. The float shaft is fully guided toprovide smooth, long lasting operation.No Troublesome LinkageUnique disc air release venting concept eliminateslinkages that can foul on dirty service applications.Reliability Without ConstantMaintenanceClean interior design and the direct shaft mountedfloat eliminates troublesome linkages that canlead to frequent maintenance. The light weight,one-piece internal assembly can be easily lifted outof the valve body by the top cover.The shape of the upper valve body creates an aircompression chamber to limit fluid level and solidsinterference. The funnel shaped lower body reducessolids buildup on sewage or other services wheresolids may interfere with operation, yet it still allowsfor maximum outflow and self-cleaning.For applications where standard practice callsfor periodic maintenance, back flush ports arestrategically located for ease of flushing with anoptional back flush kit.Larger Sizes, Higher PressuresValves to 300 psi are available in sizes 1" through4" with 150 psi valve sizes available through 6" asstandard. Contact DeZURIK for information andrecommendations on other sizes and pressures.For Water/Wastewater orIndustrial ServiceAll materials and seals are proven as longlife components for continuous duty service.Seals and all parts are suitable for use on water,wastewater or industrial media containinghydrocarbons, chemicals, solvents and volatiles.Recommendations available on application.www.dezurik.com3

Problem Solving Design for Improved Performance &Reliability on Dirty Service ApplicationsInnovative air release technology provides improved valve performance and operating capability withcharacterisitics specifically designed to deal with clean fluids or media with the presence of grit,solids and grease.Lifting LugsLifting lugs for ease ofvalve installation.Top Access CoverAllows easy access to the internalair valve assembly.Upper Body ShapeUpper body creates an aircompression chamber to limit fluidlevel and restrict solids interference.Flow Deflector/SplashReduction RingBuilt into the upper body to restrictsolids entry and minimize floweffect and fluid splash that cancause float instability.Hydraulics BasedFloat DesignUnique float shape increasesfloat stability at all flow rates.Large float size providesincreased bouyancy asneeded on dirty service.True FunnelShaped BodyConical shaped body allowsfor complete draining.Matched Inlet andOutlet SizesPer AWWA C512, same size inletand outlet meets the clearly definedrequirement, and provides highcapacity and a broad operating rangein a nearly universal valve design.4Back Flush PortsWhere standard practice callsfor periodic backflushing,optional back flush kitsare available.www.dezurik.com

Multi-Stage Operation Provides Dual-RangeAir ReleaseHigh CapacityMulti-Stage OperationFeatures high capacity air ventingand inflow during filling and draining;dual range air release during normalpipeline flow conditions.Air/VacuumDisc SeatAir/Vacuum DiscThe unique Air/Vacuum Disc opensto assure high flow air ventingduring pipeline filling and forquick vacuum relief duringpipeline draining.FloatShaft SealPiston Stemand SeatNo Troublesome LinkageThe internal design of the ASU valveeliminates troublesome linkagethat can trap solids and interfereoperation and affect reliabilityGuided Float ShaftThe float shaft is fully guided toprovide smooth, long-life operation.Guides prevent float misalignmentand contact with the valve body.Outlet ConfigurationsASU outlet configurations in all valve sizes are designed for full rated air flow.Standard Outlet Threaded 90º ElbowOptional VerticalThreaded Outlet (VTO)Optional Mushroom Cap(MRC)Furnished with pipe extension withdrip line beyond the valve body.Outlet is threaded to allow plantpiping of discharge. The VTO mustbe specified.Screened vertical outlet keepsdebris from entering the valveoutlet.The MRC must be specified.www.dezurik.com5

Valve OperationUnique Combination Air Valve TechnologyThe patent pending design of the ASU CombinationAir Valve features multi-stage air release operationand air/vacuum service provided by the Air/Vacuum Disc.Pipeline FillingPipeline FillingNormal Flow:Low Air BleedPipeline FullDuring pipeline filling, the Air/Vacuum Disc remainsopen allowing high volumes of air to escape.When the pipeline is full, fluid enters the valvewhich raises the float and lifts the Air/Vacuum Discinto the closed position. Valve is completely sealed;Air/Vacuum Disc seat, piston stem seat and floatshaft seals are all in the closed position.6Dual Range Air ReleaseDuring normal system operation, air escapes fromthe fluid, collects at high points in the pipeline, andenters the valve. When enough air collects in thevalve, it causes the float and float shaft to movedown. In this minimal air release mode, the floatposition allows the valve to release a small amountof air past the float shaft seals. The released air isreplaced by fluid entering the valve inlet, raising thefloat to the valve's closed position.www.dezurik.com

Normal Flow:High Air BleedIf a larger amount of air collects in the pipelineduring normal operation and enters the valve, itcauses the float and float shaft to move down evenfarther causing the upper part of the float shaft toseal off the piston chamber. Trapped air continuesto accumulate in the piston chamber, causing apressure imbalance. The piston moves down,allowing the valve to release a larger amount of airpast the piston stem and seat.www.dezurik.comPipeline DrainingWhen the pipeline is drained, or if a sudden breakoccurs, the valve quickly opens allowing highvolumes of air to enter the pipeline. As fluid level inthe valve drops, the float and float shaft move down,which allows the Air/Vacuum Disc to drop down,opening the pathway for high volume air to be pulledthrough the valve, reducing the risk of pipelinecollapse due to excessive vacuum.7

Field-Proven PerformanceThe APCO ASU Combination Air Valvewas developed with 2 years of designand development testing and extensivefield experience. In the field, userswere consistently impressed with theperformance and improved reliability ofthe ASU, which far exceeded other valvespreviously installed in the same location.The ASU resisted clogging from grease,grit and debris meaning less maintenance,improved system reliability withreduced cost.8www.dezurik.com

Materials of ConstructionItem Item DescriptionMaterialBodyFloatFloat ShaftGuide BushingGuide MountStand Off TubeScrewCoverUpper Pressure Cap(CAV)Top Cap A28A30A31316 Stainless Steel, ASTM A240/A276316 Stainless Steel, ASTM A240/A276316 Stainless Steel, ASTM A276, Condition AAcetal Homopolymer or Copolymer (POM)316 Stainless Steel, ASTM A240316 Stainless Steel, ASTM A269 or A511316 Stainless Steel316 Stainless Steel, ASTM A351, Type CF-8MAcetal Homopolymer or Copolymer (POM)316 Stainless SteelAcrylonitrile-Butadiene (NBR)316 Stainless Steel, ASTM A351, Type CF-8M,Air/Vacuum Disc and Seatwith Acrylonitrile-Butadiene (NBR) SeatClevis Pin with RetainerStainless Steel, Type 18-817-4 PH Stainless Steel, Type 630, ASTM A564,Piston StemCondition H1150 or H1150D, with Acrylonitrileand SeatButadiene (NBR) SeatOutletAcetal Homopolymer or Copolymer (POM)Screw316 Stainless ackup RingO-RingPipe ExtensionPlugPlugData PlateScrewLift LugOutlet (MRC)ScrewOutlet(VTO Option)GasketLower Pressure CapA23316 Stainless Steel, ASTM A276, Condition AAcrylonitrile-Butadiene (NBR)Acrylonitrile-Butadiene (NBR)Acrylonitrile-Butadiene (NBR)Acetal Homopolymer or Copolymer (POM)Acrylonitrile-Butadiene (NBR)Polyvinylchloride (PVC)316 Stainless Steel (SCAV Only)316 Stainless Steel316 Stainless Steel316 Stainless Steel304 Stainless Steel304 Stainless Steel316 Stainless Steel303 Stainless SteelAcrylonitrile-Butadiene (NBR) & PVC FoamAcetal Homopolymer or Copolymer 12A27A20A26A28A21A13A8A14STANDARD 90º THREADED OUTLETA4A16A6A32A5A33A11A7A24A3A2OPTIONAL VERTICAL THREADED OUTLET(VTO)A1A31A30A25PATENT PENDINGwww.dezurik.comOPTIONAL MUSHROOM CAP(MRC)9