The Aluminum Alloy Air Operated Double Diaphragm Pump (AODD) utilizes compressed air to drive dual flexible diaphragms, creating positive displacement for continuous-duty industrial fluid transfer. Built with a robust bolted aluminum housing, it ensures high structural integrity and safe, non-sparking operation in demanding industrial environments.
Operating Principle: Pneumatically actuated dual diaphragms reciprocate via an unlubricated internal air distribution valve, eliminating mechanical linkage wear and providing high resistance to stalling.
Core Engineering Advantages:
• Bolted Construction: Prevents liquid leakage and gasket failure under high cycle rates compared to conventional clamped designs.
• Stall-Free Air Valve: Engineered with a low-friction pilot spool to eliminate ice formation and center-position stalling.
• Self-Priming Capability: Delivers dry prime up to 5 meters, safely handling viscous and shear-sensitive media without mechanical degradation.
• Dead-Head Safe: Automatically stalls against a closed discharge valve without thermal buildup or component damage, and instantly resumes operation when the valve opens.
Typical Fluids Handled:
• Solvent-borne and water-based paints, lacquers, and varnishes.
• Adhesives, sealants, and high-viscosity printing inks.
• Industrial wastewater, machining coolants, and oily emulsions.
• Petrochemical additives, waste oil, and general lubricants.
Typical Industries:
• Paint & Coating Manufacturing Systems
• Chemical Processing & Fluid Blending
• Printing & Packaging Machinery OEM
• Automotive Assembly Fluid Delivery Lines
• Industrial Wastewater Treatment
Product Selection & Technical Specifications
Match your system requirements with the standard engineering parameters below to ensure proper hydraulic sizing.
|
Model Series |
Port Size (NPT/BSP) |
Max. Flow Rate |
Max. Discharge Pressure |
Max. Solid Passage |
Wetted Parts Material |
Available Diaphragm Options |
|
AODD-15A |
1/2" |
57 L/min (15 US gpm) |
7.0 bar (100 psi) |
2.0 mm (5/64") |
ADC12 Aluminum |
PTFE, Santoprene, Buna-N |
|
AODD-25A |
1" |
189 L/min (50 US gpm) |
8.4 bar (120 psi) |
3.2 mm (1/8") |
ADC12 Aluminum |
PTFE, Santoprene, Viton |
|
AODD-40A |
1-1/2" |
378 L/min (100 US gpm) |
8.4 bar (120 psi) |
4.8 mm (3/16") |
ADC12 Aluminum |
PTFE, Hytrel, Neoprene |
|
AODD-50A |
2" |
568 L/min (150 US gpm) |
8.4 bar (120 psi) |
6.4 mm (1/4") |
ADC12 Aluminum |
PTFE, Santoprene, Viton |
Note: For abrasive ceramic slurries or fluids exceeding 5,000 cps viscosity, consult engineering for flow-derating curves and ball-check valve optimization.
Application & Chemical Compatibility Guide
Selecting the precise elastomer and wetted material prevents premature diaphragm failure and fluid contamination.
Paints & Coatings: Standard ADC12 aluminum body paired with Santoprene or PTFE diaphragms resists titanium dioxide abrasion and organic solvent swelling without shear damage.
Wastewater & Effluent: Generous internal clearance allows smooth passage of suspended particulate (up to 6.4 mm on 2" models) without clogg
Supplier Verification & Manufacturing Standards
Procuring industrial equipment requires verifiable quality control protocols at every stage of production.
Raw Material Integrity:
Aluminum pump bodies are manufactured from high-purity ADC12 ingots via precision die-casting, ensuring zero porosity under pressure tests up to 120 psi.
Machining Precision:
Fluid chambers and air valve bores are machined on high-precision 5-axis CNC centers to maintain strict dimensional tolerances (+/-0.01 mm), preventing internal pneumatic blow-by.
Factory Testing Protocol:
100% of manufactured units undergo individual pneumatic leak testing and dry-prime performance verification before crating, recording flow rate and stall benchmarks.
Regulatory Compliance:
Produced under an ISO 9001 certified quality management system; fully CE compliant and ATEX certified for explosive gas atmospheres.
Procurement Decision & Ordering Information
Minimum Order Quantity (MOQ): 1 unit accepted for sample testing; flexible batch frameworks for OEM production lines.
Lead Time: Standard aluminum configurations ship within 5 to 7 business days; custom elastomer builds require 10 business days.
Packaging Standards: Export-grade, fumigation-free plywood crates featuring internal moisture barrier wrapping to prevent oxidation during maritime transit.
Spare Parts Availability: Comprehensive stock of modular service kits (diaphragms, valve balls, seats) maintained for immediate dispatch to minimize plant downtime.
Request for Quotation (RFQ) Checklist
To expedite your formal engineering proposal, please provide the following operational parameters to our application team:
• Exact fluid name, concentration, and operating temperature.
• Required flow rate and total dynamic head (discharge pressure).
• Fluid viscosity and specific gravity.
• Available on-site compressed air supply pressure.
• Port connection specification (NPT, BSP, or ANSI Flange).
Frequently Asked Questions
Q: Can this aluminum air operated double diaphragm pump run dry safely without internal damage?
A: Yes. AODD pumps can run dry indefinitely without generating destructive friction heat or scoring the housing, as there are no tight-fitting or rotating parts dependent on fluid lubrication.
Q: What is the typical suction lift performance for dry starts versus wetted starts?
A: Under a dry start, standard models achieve 3.0 to 4.5 meters (10 to 15 feet) of suction lift depending on pump scale and elastomer flexibility. With wetted diaphragms, suction lift increases up to 6.0 to 8.0 meters (20 to 26 feet).
Q: How can I prevent ice accumulation on the air exhaust during high-cycle continuous operation?
A: Exhaust icing occurs when compressed air expands rapidly across high-frequency cycles in humid conditions. This is prevented by installing an air line moisture separator/dryer upstream, or by regulating down the inlet air pressure while sustaining required fluid output.
Q: Are these pumps certified for transferring flammable solvents safely?
A: Yes, when utilizing groundable aluminum models. The housing includes an external grounding lug to attach an earth wire, safely discharging static electricity generated by fast-flowing solvents in compliance with ATEX directives.
Q: What is the operational lifespan trade-off between PTFE and elastomer diaphragms?
A: PTFE diaphragms provide maximum chemical resistance against aggressive acids and organic solvents but offer lower mechanical flex-life than elastomers like Santoprene or Buna-N. For non-aggressive or mildly corrosive fluids, Santoprene typically yields the longest duty cycles, often exceeding 50 million flex cycles.
Q: What troubleshooting steps should be taken if the pump fails to stroke or stalls mid-operation?
A: First, confirm that incoming air pressure matches the minimum operational threshold (at least 2.0 bar / 30 psi). If air supply is stable, inspect the pilot spool and main air valve for particulate obstruction or insufficient lubrication, and check fluid ball-check valves for debris jamming.
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