- The air valve directs pressurized air to the backside of Diaphragm A, pushing it away from the center of the pump. Acting as a separation membrane between the compressed air and liquid, the elastomeric diaphragm applies pressure to the liquid column, while also balancing the load in order to remove mechanical stress from the diaphragm.
- As the compressed air moves Diaphragm A away from the center of the pump into its discharge stroke, the pressure created within Chamber A pushes out the liquid through its discharge valve.
- At the same time, the common shaft pulls the opposite diaphragm (Diaphragm B) inward on its suction stroke with the air behind it having been forced out to the atmosphere through the exhaust port of the pump.
- The movement of Diaphragm B toward the center of the pump creates a vacuum within Chamber B. Atmospheric pressure forces fluid into the inlet manifold forcing the inlet valve ball in Chamber B off its seat. The liquid is then free to move past the inlet valve ball and fill liquid Chamber B (see shaded area).
- When the pressurized diaphragm, Diaphragm A, reaches the limit of its discharge stroke, the air valve redirects pressurized air to the backside of Diaphragm B.
- The pressurized air forces Diaphragm B away from the center while pulling Diaphragm A toward the center via the common shaft.
- Diaphragm B is now on its discharge stroke, which forces the inlet valve ball in Chamber B onto its seat due to the hydraulic forces developed in Chamber B and the manifold of the pump. These same hydraulic forces lift the discharge valve ball off its seat in Chamber B; while the opposite discharge valve ball in Chamber A is forced onto its seat, forcing fluid to flow through the pump discharge.
- The movement of Diaphragm A toward the center of the pump creates a vacuum within Chamber A and the atmospheric pressure forces fluid into the inlet manifold of the pump.
- The inlet valve ball in Chamber A is forced off its seat, allowing the fluid being pumped to fill Chamber A from the inlet manifold.
- At the completion of the stroke, the air valve again redirects air to the backside of Diaphragm A, which starts Diaphragm B on its exhaust stroke.
- As the pump reaches its original starting point, each diaphragm has gone through one exhaust and one discharge stroke. This constitutes one complete pumping cycle.
- The pump may take several cycles to completely prime depending on the conditions of the application.
- BOLTED METAL
- BOLTED PLASTIC
- CLAMPED METAL
- CLAMPED PLASTIC
- Energy – Petroleum/oil-based fluids such as leaded gasoline, fuel oils, biofuel, hydraulic oils, kerosene, turpentine and motor oils.
- Chemical/Process –Aggressive fluids such as aromatic and chlorinated hydrocarbons; highly aggressive acids; caustics; ketones; and acetates. Paints and coatings.
- Transport – Dry/wet bulk
- Hygienic & Sanitary – Food, beverage, dairy, cosmetic, personal care and pharmaceuticals
- Water/Wastewater – Water-based slurries, well water, wastewater and seawater.
- Military and Marine – Fuel, water/wastewater, dry/wet bulk
- HYGIENIC AND SANITARY APPLICATIONS
- ELECTRONIC CONTROL APPLICATIONS
- UTILITY APPLICATIONS
- HIGH PRESSURE APPLICATIONS
- MINING APPLICATIONS
- LARGE SOLIDS PASSAGE APPLICATIONS
- NATURAL GAS-OPERATED APPLICATIONS
- OIL AND GAS APPLICATIONS
- SKIDS, SYSTEMS & DOSING
- ¼ INCH (6 MM)
- ½ INCH (13 MM)
- 1 INCH (25 MM)
- 1 ½ INCH (38 MM)
- 2 INCH (51 MM)
- 3 INCH (76 MM)
- 4 INCH (102 MM)
- REPAIR KITS AND PARTS - WET KITS AND AIR KITS
- PUMP CYCLE MONITOR
- UNIVERSAL DRUM PUMP KIT
- DIAPHRAGM MONITORING SYSTEM
AODD pump range has the widest of pump materials of construction options available :
WETTED/ NON-WETTED MATERIALS
- Cast Iron
- 316 Stainless Steel
- 316 Hastelloy “C”
Wetted Material Compatibility
Numerpic PH Level
- Neoprene:An excellent general purpose diaphragm for use in nonaggressive applications such as water-based slurries, well water or sea water. Exhibits excellent flex life and low cost.
- Buna-N:Excellent for applications involving petroleum/oil-based fluids such as leaded gasoline, fuel oils, hydraulic oils, kerosene, turpentines and motor oils.
- EPDM:Excellent for use in applications requiring extremely cold temperatures. It may also be used as a low cost alternative for pumping dilute acids or caustics.
- Viton®:Excellent for use in applications requiring extremely hot temperatures. Viton® may also be used in aggressive fluids such as aromatic or chlorinated hydrocarbons and highly aggressive acids. PTFE would normally be used with these aggressive fluids as its flex life is better than Viton®; however, in applications involving suction lift outside the range of PTFE, Viton® will be the preferred choice for highly aggressive fluids.
THERMOPLASTIC ELASTOMER (TPE)
- Polyurethane:An excellent general purpose diaphragm for use in nonaggressive applications. This material exhibits exceptional flex life and durability. Most economical diaphragm.
- Wil-Flex™:Made of Santoprene™, this diaphragm is an excellent choice as a low cost alternative to PTFE in many acidic and caustic applications such as sodium hydroxide, sulfuric or hydrochloric acids. Wil-flex™ offers excellent abrasion resistance and durability, at a cost comparable to neoprene. Sanitary options include: full-stroke length Integral Piston Diaphragms (IPD) and a sanitary Wil-Flex™ material with a special flex profile allowing for an “easy install.”
- Saniflex™:Made of Hytrel®, this diaphragm exhibits excellent abrasion resistance, flex life and durability. This material is FDA approved for food processing applications.
- Geolast®:Equivalent to nitrile (Buna-N), this diaphragm is an injection-moulded material that is an excellent choice for applications requiring enhanced oil resistance. This material exhibits exceptional performance for a variety of fluids.
- PTFE:Excellent choice when pumping highly aggressive fluids such as aromatic or chlorinated hydrocarbons, acids, caustics, ketones and acetates.
- PTFE integral piston diaphragmsthat offer superior product containment. The smooth contoured shape makes this diaphragm an excellent choice for sanitary or ultra-pure applications.
Acetal: –28.9°C to 82.2°C
Carbon-Filled Acetal: –28.9°C to 65.6°C
Nylon: –17.8°C to 93.3°C
Polypropylene: 0°C to 79°C
PVDF: –12°C to 107°C
Teflon® PFA: –28.9°C to 107.2°C
Elastomer Temperature Limits
POLYPROPYLENE: 0°C to 79°C
PVDF: –12°C to 107°C
PFA: 7°C to 107°C
NEOPRENE: –18°C to 93°C
BUNA-N: –12°C to 82°C
EPDM: –51°C to 138°C
ACETAL: –29°C to 82°C
POLYETHYLENE: 0°C to 70°C
VITON® FKM: –40°C to 177°C
WIL-FLEX™: –40°C to 107°C
SANIFLEX™: –29°C to 104°C
POLYURETHANE: –12°C to 66°C
PTFE: 1: 4°C to 104°C
NYLON: –18°C to 93°C
GEOLAST®: –40°C to 82°C
Features & Benefits
Air Operated Double Diaphragm Pumps are extremely versatile due to the following capabilities:
- Ability to Run Dry– AODD pumps are able to run-dry without damage. This is a very useful feature to have when the pumping application may result in varying & inconsistent suction conditions
- Ability to Self-Prime– this means that AODD pumps can be used as sump pumps & where positive suction conditions are not available
- Ability to Pass Solids– the ball & seat/ check-valve design allows for the pump to pass solid particles. This is beneficial in a wide range of applications such as pumping slurries or food products with seeds
- Variable Flowrate & Discharge Pressure– varying of air supply to the pump will vary the flowrate and/ or pressure that the pump produces; an inexpensive variable speed drive!
- Seal-less/ Leak Free Design– no mechanical seal means that the pumps are totally contained & leak-free. A leak detector can be fitted to prevent leakage in the case of diaphragm failure
- Ease of Maintenance– diaphragm pumps are simple, non-technical & require no specialist training for maintenance. There are no special clearances or tools required for pump repairs
- Lube-free Operation– AODD pump’s air motors do not require external lubrication for operation
- Anti-Stalling/ Anti-Freezing Air Motor– the air valve is designed to be anti-stalling & anti-freezing; this assists allowing the pumps to be continuously operated.
- Intrinsically Safe– no electrical power or auxiliary requirements meaning that a AODD pump is Intrinsically Safe and can be operated in many hazardous situations/ applications like underground coal mines.
- Submersible Options– most models can be fully submerged. Refer to the operation manual for further information. When using a submersible pump, both the liquid path and external components must be compatible with material in which the pump will be submersed. Submersed pumps must have a hose attached to air exhaust and the exhaust piped above liquid level.