Bianfeng Air Operated Diaphragm Pump Supplier in BD
The Bianfeng air operated diaphragm pump is a compressed-air-driven AODD pump from a Chinese manufacturer, built to move corrosive, abrasive and solids-laden liquids with no electric motor at the pump. Techno Bangla Creation supplies it in Bangladesh with engineer-checked material selection and after-sales support.
What Is an Air Operated Diaphragm Pump?
An air operated diaphragm pump (AODD pump) is a positive displacement pump driven by compressed air instead of an electric motor. Air pushes two flexible diaphragms back and forth on a shared shaft, drawing liquid in and forcing it out. It moves acids, solvents, sludge and other difficult liquids.
An AODD pump is a transfer pump, not a precise dosing pump. For accurate chemical feed rates, see our chemical dosing pump page. For drums and small containers, see our drum and container pump.
- Air-driven, so no electric motor sits at the pump
- Body options from plastic to aluminium and stainless steel
- Suited to chemical transfer, sludge and filter press feed
- Installation and after-sales support in Bangladesh
Air Operated Diaphragm Pump Specifications
- Type
- Air operated double diaphragm pump, positive displacement
- Power source
- Compressed air
- Materials
- PVDF, PTFE, PP, aluminium alloy, stainless steel, cast steel
- Application
- Chemical transfer, acids, solvents, corrosive liquids, sludge transfer for dewatering, food processing
- Typical AODD range
- 0.25 ~ 4 inch ports (about 6 ~ 100 mm), about 19 ~ 1,100 L/min (about 1 ~ 66 m³/hr)
- Brand
- Bianfeng
- Origin
- China
The "typical AODD range" is the general industry span, not a Bianfeng limit. Port size, flow, air pressure, air use, solids size and materials depend on the model. Send us your duty and our engineers will confirm the datasheet values of the exact model.
How Does an AODD Pump Work?
- Compressed Air EntersAir from your compressor passes through a regulator into the pump's air valve.
- Air Pushes One DiaphragmThe air pressure moves one diaphragm outward. A linked shaft pulls the other diaphragm inward.
- Liquid Is Drawn InThe pulled-in chamber grows, and liquid lifts the inlet check ball and fills it.
- Liquid Is Pushed OutThe pushed-out chamber shrinks, closes its inlet ball and sends liquid through the discharge.
- Air Valve Shifts, Cycle RepeatsThe air valve switches sides, so the two chambers swap roles. Speed follows air pressure and back pressure.
Which Body and Diaphragm Material Should You Choose?
Match the material to your liquid first. Wrong material is the main cause of early failure.
| Part and material | Suits | Watch out for |
|---|---|---|
| Body: Polypropylene (PP) | Acids, alkalis and salt solutions at low cost | Aromatic solvents and strong oxidising acids |
| Body: PVDF | Strong acids and a wider chemical range, with higher temperature tolerance | Special chemicals such as hydrofluoric acid need a compatibility chart |
| Body: Aluminium alloy | Neutral liquids, oils, paints and clean water | Acids, caustic and brine attack it |
| Body: Stainless steel 316 | Food service, mild chemicals, solvents and abrasive liquids | Hydrochloric acid and chloride-rich liquids |
| Body: Cast steel or cast iron | Wastewater and sludge transfer | Corrosive chemicals |
| Diaphragm: PTFE | Widest chemical range and hot liquids | Stiff, so often paired with a flexible backing diaphragm |
| Diaphragm: Santoprene or EPDM | Water, wastewater and mild chemicals | EPDM swells in oils and hydrocarbons |
Guide values come from pump makers' material guides. Always check your liquid and concentration on a chemical compatibility chart, and confirm which diaphragm, ball and seat options the exact Bianfeng model offers.
Key Benefits
Built for liquids that damage or clog ordinary pumps.
- No electric motor at the pump, which helps in wet areas and where sparks must be avoided
- Handles corrosive, abrasive, viscous and solids-laden liquids with the right materials
- Self-priming, so it can sit above the tank and draw liquid up
- Can be deadheaded against a closed valve without damage, as reported by pump makers
- Flow adjusts by air pressure or a discharge valve, with no inverter needed
- Local engineering and after-sales support from Techno Bangla
Is an AODD Pump Right for Your Plant?
Choose an AODD Pump When
- The liquid is corrosive, abrasive, viscous or carries solids
- You move acid, caustic, solvent or sludge between tanks
- The pump must self-prime or may run dry at times
- Flow is low to medium and a pulsating flow is acceptable
- Your plant already has a compressed air supply
Choose Another Pump When
- You need high, steady flow of clean liquid. Use a centrifugal pump
- You need accurate small feed rates. Use a metering dosing pump
- You have no compressor and air would be costly to add
- Noise is a problem and you cannot fit a muffler
- The pump can sit in the tank. See our submersible sewage pump
Where AODD Pumps Are Used
Any plant that moves aggressive or solids-laden liquid in batches.
- Acid and Caustic Transfer
- Solvent Transfer
- ETP Sludge Transfer
- Filter Press Feed
- Sump and Pit Emptying
- Textile and Dyeing Chemicals
- Food Processing
- Tank Clean-Out
How to Choose the Right AODD Pump
Share these details with our engineers and we will recommend a suitable model and size.
- Liquid and concentration. This decides body and diaphragm material. Never put acid or caustic through an aluminium body.
- Flow and discharge pressure. Discharge pressure cannot exceed air supply pressure. Pumps in this class often list about 7 bar (roughly 100 psi) maximum air.
- Solids size and abrasion. Check the maximum particle size on the datasheet. Sludge and filter press feed need wear-resistant parts.
- Compressed air supply. Catalogues of this class list maximum air use from about 0.3 to 1.5 m³/min by size. Size your compressor to match, and ask about air filter, regulator and drain for humid Bangladesh conditions.
- Suction lift, pulsation and noise. Catalogues list suction lift of roughly 5 to 7 m, and less with thick liquid. Add a pulsation dampener on long pipes and a muffler on the exhaust.
Frequently Asked Questions
Is Bianfeng a good brand for air operated diaphragm pumps in Bangladesh?
Bianfeng is a Chinese manufacturer of pneumatic diaphragm pumps, and Techno Bangla Creation supplies its AODD range with local support. Judge any pump by its datasheet. Ask for the materials, maximum air pressure and solids size of the exact model before you order.
How much does a Bianfeng AODD pump cost in Bangladesh?
Price depends on port size, body material, diaphragm material and whether the model is plastic, aluminium or stainless steel. A small aluminium pump costs far less than a large PVDF unit. Send your liquid, flow and air supply and our engineers reply with a free quotation. Add Techno’s own price bands to the page.
Why does my AODD pump stall or ice up in humid weather?
Wet compressed air is the usual cause: the exhaust cools as the air expands, and moisture can freeze or slow the air valve. Other causes are low air pressure or volume, a blocked muffler, or a blocked suction line. Fit an air filter, regulator and drain, and our engineers can review the supply.
Can an AODD pump handle thick liquids like paint or polymer?
It often handles thicker liquids than a centrifugal pump, but flow falls as viscosity rises. Larger ports and slower strokes help. Tell us the liquid’s viscosity at pumping temperature so we can choose a suitable size.
What liquid temperature can a Bianfeng AODD pump take?
It depends on the body and diaphragm materials. Plastic bodies generally have lower limits than metal ones, and PTFE diaphragms cope with the widest range. Confirm the limit on the datasheet of the exact model.
How can I get a quotation for an air operated diaphragm pump?
Send your liquid, required flow, discharge pressure and available compressed air to our engineers by phone or email. We reply with a free quotation for your ETP, WTP, STP or water treatment equipment.
