QBK Pneumatic Diaphragm Pumps also called Air operated double diaphragm pumps(AODD Pump)are rugged and durable self-priming, double diaphragm pumps, can handle any products that pours, form clean water to highly viscous, abrasive and chemically materials.
Simple structure, easy to use and maintenance, less wearing parts. It can be working under liquid and running dry as well.
Suction up to 5m, max discharge pressure is 7bar, max grain diameter is 10mm, max liquid viscosity is 10,000C.s.t.
Material:PP, Aluminum, Cast Iron, Stainless Steel. Diaphragm material:NBR, Viton, Teflon, FEP etc.
Flow rate can be controlled from zero to max flow by increasing or decreasing air pressure.
| Model | Diameter(mm) | Max Flow(L/min) | Suction(m) | Max Discharge Pressure(Bar) | Max Grain Dia(mm) | Max Air Consumption(L/min) |
| QBK-8 | 8 | 16 | 5 | 6.9 | 1 | 300 |
| QBK-10/15 | 10/15 | 20 | 5 | 6.9 | 1 | 300 |
| QBK-25 | 25 | 100 | 5 | 6.9 | 2.5 | 600 |
| QBK-40 | 40 | 140 | 5 | 6.9 | 4.5 | 600 |
| QBK-50 | 50 | 240 | 5 | 6.9 | 8 | 900 |
| QBK-65 | 65 | 280 | 5 | 6.9 | 8 | 900 |
| QBK-80 | 80 | 400 | 5 | 6.9 | 10 | 1500 |
| QBK-100 | 100 | 480 | 5 | 6.9 | 10 | 1500 |
QBK-25 SS304 Pneumatic Diaphragm Pump (AODD Pump): Complete Product Guide
The QBK-25 SS304 Pneumatic Diaphragm Pump (AODD Pump) is a high-performance, air-operated double diaphragm pump engineered for reliable and efficient liquid transfer in industrial, chemical, and commercial applications. Constructed with SS304 stainless steel, the pump provides excellent corrosion resistance, durability, and long service life, making it ideal for handling a wide range of liquids, including aggressive chemicals, viscous fluids, and water-based solutions.
The QBK-25 AODD Pump operates without electricity, ensuring safe usage in hazardous environments, and delivers a smooth, pulsation-free flow for precise and consistent liquid transfer. Its lightweight design and easy maintenance make it a preferred choice for industries requiring safe, energy-efficient, and reliable pumping solutions.
Corrosion-Resistant Construction
SS304 stainless steel body and wetted parts ensure long-term resistance to chemical corrosion.
Suitable for acids, alkalis, and other aggressive liquids.
Air-Operated Efficiency
Operates using compressed air, eliminating the need for electrical power.
Reduces operational risks in flammable or hazardous environments.
Pulsation-Free Flow
Designed for smooth liquid transfer, minimizing turbulence and backflow.
Ideal for sensitive process applications in chemical and pharmaceutical industries.
Lightweight and Compact Design
Facilitates easy installation and relocation.
Reduces footprint requirements in confined spaces.
Low Maintenance Requirements
Simple design with minimal moving parts.
Quick access to diaphragms, valves, and seals for inspection or replacement.
Energy Efficiency
Optimized air usage reduces compressed air consumption.
Efficient pumping reduces operational costs over long-term usage.
| Parameter | QBK-25 SS304 AODD Pump Details |
|---|---|
| Pump Type | Pneumatic Diaphragm (AODD) |
| Material of Construction | SS304 Stainless Steel |
| Flow Rate | 25 L/min (typical) |
| Maximum Pressure | 7 bar |
| Maximum Suction Lift | 6 m |
| Maximum Discharge Head | 20 m |
| Air Supply Pressure | 2–7 bar |
| Air Consumption | 3–5 m3/min |
| Viscosity Range | Up to 1000 cP |
| Fluid Temperature Range | -20°C to 80°C |
| Inlet / Outlet Connection | 1" BSP / NPT Threaded |
| Certifications | CE, ISO 9001 (depending on model) |
Proper installation ensures optimal performance, longevity, and safe operation of the QBK-25 AODD Pump.
Verify pump model and connection type with the piping system.
Ensure all components, including diaphragms, valves, and fittings, are intact and free from damage.
Confirm availability of clean, dry compressed air supply.
Install the pump on a stable, level surface to minimize vibration.
Secure the pump using appropriate bolts or mounting brackets.
Avoid locations with excessive dust, heat, or moisture.
Connect inlet and outlet pipes according to flow direction markings.
Use thread sealant or gaskets to prevent air or liquid leaks.
Ensure straight pipe runs to minimize turbulence (minimum 3×DN upstream, 2×DN downstream).
Connect the compressed air supply using a clean, lubricated, and regulated line.
Install a filter and pressure regulator to maintain consistent operation.
Gradually open the air supply to start the pump.
Monitor for leaks, abnormal noise, or pulsation during the first few minutes.
Adjust air pressure to achieve the desired flow rate and efficiency.
Always follow the flow direction indicated on the pump body.
Ensure the pump is primed properly before operation to prevent dry running.
Avoid running the pump with abrasive fluids without proper filtration.
Operate only with authorized compressed air supply within recommended pressure limits.
Wear personal protective equipment (PPE), such as gloves and goggles, when handling hazardous liquids.
Ensure all connections are tight and leak-free before starting the pump.
Never use the pump for explosive or flammable liquids without proper safety certifications.
Disconnect the air supply and relieve pressure before performing maintenance or inspection.
The QBK-25 AODD Pump is designed for energy-efficient operation:
Optimized diaphragm movement reduces air consumption per liter pumped.
Consistent flow minimizes wasted energy due to pulsation or backflow.
Compact and lightweight design reduces installation effort and supporting infrastructure costs.
Energy efficiency contributes to lower operational costs in continuous or high-volume applications.
Regular maintenance ensures long-term reliability and optimal pump performance.
| Problem | Possible Cause | Solution |
|---|---|---|
| Pump not operating | No air supply, blocked air line | Check air supply, clean air filter, inspect tubing |
| Low flow or reduced output | Clogged inlet/outlet, worn diaphragm | Clean valves and tubing, replace diaphragm |
| Air leakage from pump | Damaged seals or connections | Replace seals, tighten fittings |
| Excessive vibration or noise | Improper mounting, cavitation | Reinstall pump securely, check suction line, reduce air pressure |
| Pulsation in liquid flow | Blocked discharge or air in lines | Clear obstructions, purge air bubbles |
Daily: Inspect for leaks, monitor air supply, and check for unusual noise.
Weekly: Inspect diaphragms, valves, and seals for wear or damage.
Monthly: Perform full cleaning of pump internals and lubricate moving parts if required.
Annually: Replace worn diaphragms and valves, perform operational and efficiency tests.
The QBK-25 SS304 Pneumatic Diaphragm Pump is widely used in:
Chemical Industry – Transfer of acids, alkalis, solvents, and corrosive liquids.
Water and Wastewater Treatment – Dosing chemicals and transferring sludge or wastewater.
Food and Beverage – Safe handling of syrups, juices, and other food-grade liquids.
Pharmaceutical Industry – Precision dosing and transfer of liquid medicines or solutions.
Industrial Manufacturing – Lubrication, chemical injection, and process automation.
Corrosion-Resistant: SS304 stainless steel construction for durability.
Air-Operated: Safe for hazardous areas, no electricity needed.
Energy-Efficient: Optimized air usage for cost savings.
Smooth Flow: Minimizes pulsation and turbulence.
Compact Design: Easy to install in confined spaces.
Low Maintenance: Simple design allows for quick diaphragm and valve replacement.
Certified Safety: CE and ISO certifications ensure safe operation and quality compliance.
Pumps are packed in anti-shock foam and corrugated boxes for small models.
Wooden crates are used for export or larger pumps.
Moisture-proof wrapping ensures safe transport over long distances.
Clear labeling includes model number, serial number, air pressure rating, and handling instructions.
Available via air, sea, or express courier.
Bulk packaging and palletization available for distributors.
Complies with international shipping standards.
The QBK-25 SS304 Pneumatic Diaphragm Pump (AODD Pump) provides a robust, reliable, and energy-efficient solution for liquid transfer in industrial, chemical, food, and pharmaceutical applications. Its stainless steel construction, pulsation-free operation, air-operated design, and low maintenance requirements ensure long-term operational efficiency and safety.
Whether for chemical dosing, water treatment, industrial automation, or food-grade liquid handling, the QBK-25 AODD Pump offers precise, safe, and cost-effective pumping performance, making it a trusted choice for global industries.
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