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Our industrial plastic AODD pumps are engineered for safe, leak-free transfer of aggressive chemicals, acids, and high-purity fluids. Utilizing compressed air as the power source, these pumps eliminate mechanical seals and rotating parts, preventing fluid shear and allowing safe operation against closed discharge valves.
Operating Principle
Compressed air is directed alternately by an internal air-distribution valve to the back of each diaphragm. The reciprocating motion forces fluid from one liquid chamber while simultaneously refilling the opposite chamber. This dual-diaphragm design ensures a smooth, continuous flow pattern and equalized internal pressures.
Core Engineering Advantages
• Zero Dynamic Seals: Eliminates mechanical seal failures and hazardous chemical leakage risks.
• Run-Dry Capability: Operates dry without damage to internal components or pump seizure.
• Dead-Head Protection: Automatically stalls against closed discharge lines without pressure buildup or thermal overload, restarting instantly when flow opens.
• Shear-Sensitive Fluid Handling: Low internal velocity protects polymers, slurries, and shear-sensitive emulsions from structural degradation.
• Modular Air Valve System: Stall-free, non-icing pneumatic valve design minimizes compressed air consumption and maintenance downtime.
Typical Handled Media & Target Industries
• Handled Media: Hydrochloric Acid (HCl), Sulfuric Acid (H2SO4), Nitric Acid (HNO3), Sodium Hypochlorite (Bleach), Sodium Hydroxide (Caustic Soda), Polymer Solutions, Coagulants, Flocculants, Deionized Water, Wastewater Sludge, and Solvents.
• Target Industries: Chemical Processing & Distribution, Water & Wastewater Treatment, Electroplating & Surface Treatment, Pulp & Paper Manufacturing, and Electronics & Semiconductor Manufacturing.
To ensure optimal performance and long service life, match your operating requirements against the standard specifications below.
|
Model Series |
Port Size (In/Out) |
Max. Flow Rate |
Max. Working Pressure |
Max. Solid Size |
Wetted Material Options |
|
PDP-15 |
1/2" (NPT/BSP) |
57 Lpm (15 gpm) |
8.6 bar (125 psi) |
2.0 mm (5/64") |
PP, PVDF, PTFE |
|
PDP-25 |
1" (NPT/BSP) |
189 Lpm (50 gpm) |
8.6 bar (125 psi) |
3.2 mm (1/8") |
PP, PVDF, PTFE, Conductive PP |
|
PDP-40 |
1-1/2" (Flanged) |
378 Lpm (100 gpm) |
8.6 bar (125 psi) |
4.8 mm (3/16") |
PP, PVDF, PTFE |
|
PDP-50 |
2" (Flanged) |
681 Lpm (180 gpm) |
8.6 bar (125 psi) |
6.4 mm (1/4") |
PP, PVDF |
Performance & Flow Curve Reference
Engineering Note: Operating points must be verified against individual pump performance charts to ensure operation within the optimal efficiency zone.
• Horizontal Axis: Flow Rate (Lpm / Gpm)
• Vertical Axis: Discharge Head / Air Pressure (Bar / Psi)
• [Interactive Flow Curve Selector Tool / PDF Chart]
Material Selection Matrix
• Polypropylene (PP): General-purpose chemical resistance; cost-effective for acids, caustics, and salt solutions up to 70C (158F).
• PVDF (Polyvinylidene Fluoride): High chemical resistance and mechanical strength; suitable for aggressive strong acids, halogens, and higher temperatures up to 100C (212F).
• PTFE (Teflon) Diaphragms: Universal chemical compatibility; zero leaching; ideal for high-purity applications and aggressive solvents. Backed by an integral Santoprene backup layer for flex life.
Chemical Compatibility Reference Guide
Engineering Note: Chemical resistance is heavily influenced by fluid temperature, concentration, and operating pressure. Use the matrix below as a preliminary selection guide.
|
Chemical Media |
Concentration |
Max. Temp (C / F) |
Recommended Wetted Housing |
Recommended Diaphragm / Ball |
|
Hydrochloric Acid (HCl) |
Up to 37% |
60C (140F) |
PP or PVDF |
PTFE / Santoprene |
|
Sulfuric Acid (H2SO4) |
93% - 98% |
50C (122F) |
PVDF |
PTFE |
|
Sulfuric Acid (H2SO4) |
< 50% |
70C (158F) |
PP or PVDF |
PTFE / EPDM |
|
Sodium Hypochlorite (Bleach) |
15% |
40C (104F) |
PP or PVDF |
PTFE / Viton |
|
Sodium Hydroxide (Caustic Soda) |
50% |
80C (176F) |
PP or PVDF |
PTFE / EPDM |
|
Nitric Acid (HNO3) |
Up to 20% |
50C (122F) |
PVDF |
PTFE |
|
Deionized (DI) Water |
High Purity |
80C (176F) |
PVDF / Virgin PP |
PTFE (Zero Leaching) |
Case Study A (Chemical Distribution - Germany): A regional chemical distributor replaced legacy metallic pumps with our PDP-40 PVDF/PTFE units for offloading 35% hydrochloric acid. Result: Zero leakage incidents reported over 3 years of continuous operation, drastically lowering routine maintenance costs.
Case Study B (Wastewater Treatment - Singapore): An electronics manufacturing plant utilized PDP-25 PP pumps for handling corrosive wastewater slurries containing micro-solids. Result: The built-in dry-run and dead-head protection prevented pump burnout during unexpected line blockages.
Recommended Operating Practices
• Suction Lift Configuration: Ensure suction piping is equal to or greater than the pump port diameter to prevent flow starvation and cavitation. Flooded suction is recommended for high-viscosity fluids (> 5,000 cps).
• Air Supply Regulation: Install a filter-regulator-lubricator (FRL) unit on the air line. Use clean, dry compressed air (lubrication-free air is preferred for air valve longevity).
• Discharge Dampening: For long pipe runs or pulse-sensitive meters, install a pulsation dampener on the discharge port to reduce hydraulic shock by up to 90%.
Operational Limitations to Avoid
• Do not exceed the maximum allowable air working pressure of 8.6 bar (125 psi).
• Avoid running pumps with abrasive slurries containing particle sizes exceeding the maximum solid rating for the specific model.
• Verify chemical temperature limits against the selected plastic housing material (PP vs. PVDF).
We manufacture industrial fluid handling equipment under strict quality assurance frameworks to guarantee field reliability and seamless global export compliance.
CNC Machining Centers: Pump bodies, manifolds, and center sections are machined from solid blocks or precision-molded blanks to maintain tight dimensional tolerances and eliminate warping.
Material Traceability: All plastic raw materials (Virgin PP and PVDF resins) are sourced from certified global chemical producers with complete Lot Traceability and Certificate of Analysis (CoA).
100% Performance Testing: Every assembled pump undergoes mandatory factory testing before shipment (Air Leak Test, Dry-Stroke & Cycling Test, Hydrostatic Pressure Test at 1.5x working pressure).
Certifications: ISO 9001:2015 Quality Management System, CE conformity, and ATEX certification available upon request for explosive/hazardous environments.
OEM/ODM & Private Label Capabilities: We offer comprehensive customization options, including custom color matching, private-label branding, customized packaging, and tailor-made manifold configurations to support global distributors and brand owners.
Global Logistics & Customs Support: Standard configurations maintain safety stock for quick dispatch. Customs HS Code reference (typically classified under HS 8413.50 for reciprocating displacement pumps) is provided to streamline import cost estimations. Multi-language documentation and dedicated engineering support are available for global partners.
To receive a formal quotation or discuss OEM/ODM distribution opportunities tailored to your chemical transfer requirements, please provide the following details to our engineering team:
Fluid Name & Concentration: (E.g., 30% Hydrochloric Acid, Wastewater Sludge)
Fluid Temperature & Viscosity: (C / cps)
Required Flow Rate & Total Head (Pressure): (Lpm / bar)
Power Source Available: (Compressed air pressure available in bar/psi)
Estimated Annual Quantity, Customization Needs & Destination Port
We are one of the most professional plastic diaphragm pump manufacturers and suppliers in China, featured by quality products and good price. With abundant experience, we warmly welcome you to buy customized plastic diaphragm pump made in China here from our factory. If you have any enquiry about quotation, please feel free to email us.
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