what’s Double-diaphragm pump

What’s double diaphragm pump?

A air operated double diaphragm pump (also known as a Double-Membrane pump, pneumatic diaphragm pump or air-operated diaphragm pump) is a positive displacement pump that uses a combination of the reciprocating action of a rubber, thermoplastic or teflon / ptfe diaphragm and suitable valves on either side of the diaphragm (check valve, butterfly valves, flap valves, or any other form of shut-off valves) to pump a fluid.

How does Double Diaphragm Pump work?
Diaphragm pumps work by flexing the diaphragm out of the displacement chamber. When the diaphragm moves out, the volume of the pump chamber increases and causes the pressure within the chamber to decrease and draw in fluid. The inward stroke has the opposite effect, decreasing the volume and increasing the pressure of the chamber to move out fluid. This operation is very similar to the draw in, push out, concept of human breathing.
The fluids flow through one-way check valves, ensuring that fluid only flows in the proper direction through the chamber.

Application for Double Diaphragm Pumps
Because diaphragm pumps are so versatile, they are used in virtually every industry that requires fluid transfer. They are often used for dewatering or water removal across many different industries. They are used for filling, dispensing and metering due to their efficiency and accuracy.

They can produce plenty of pressure for spraying and cleaning applications and are often used for filter press applications.


Features of double diaphragm pumps:

  1. have good suction lift characteristics, some are low pressure pumps with low flow rates; others are capable of higher flow rates, dependent on the effective working diameter of the diaphragm and its stroke length. They can handle sludges and slurries with a relatively high amount of grit and solid content.
  2. have good dry running characteristics.
  3. High delivery capacity, light weight, compact size.
  4. Air valve with double spool
  5. High quality PTFE membrane in large diameter, generate big volume output and longer lifetime.
  6. Could be used for paint, chemical, oil, fluid transfer etc.
  7. can be up to 97% efficient.
  8. high level of performance and greatly enhance safety
  9. Could be used for Automotive Furniture Fine Finish Painting to work with W101 air spray gun.
  10. Low and high manifold with inner diameter enlarged easy for cleaning and inspection.


We offer low pressure double-diaphragm from 3/8” inch to 1” inch, delivery from 13L/min to 180L/min, small to big to meet all your demands.

Technical data:


Configurations of our DP double diaphragm pump:
1. bare pump: pump only
2. standard pump: pump+support table/shelf, inlet/outlet valve assemble, pressure gage, suction tube with filter, prime tube, buffer bottle
3. standard pump + precious fluid regulator
4. standard pump + high cart with wheels

DP-K17 Double Diaphragm Pump with W101 Spray GunDP-K17 Double Diaphragm Pump for professional use 


K18 double membrane pump

DP-K18 bare pump

K25 compressor powered pump fine finish spraying

DP-K25 standard pump

DP-K56 memebrane pump 3/4″inch high cart type with fluid regulator


SS series AODD Air-operated double diaphragm pumps (304 stainless steel pump)Stainless steel AODD Air-operated double diaphragm pump

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what’s Double-diaphragm pump

What's double diaphragm pump? A air operated double diaphragm pump (also known as a Double-Membrane pump, pneumatic diaphragm pump or air-operated diaphragm pump) is a positive displacement pump that uses a combination of the reciprocating action ...
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FAQ regarding our business

Q1: What's your MOQ minimum order quantity for formal order?

A: Our MOQ is 10-100 units depends on the model. For small pump or spray guns , the MOQ is 100. and for large capacity pump, the MOQ could be 10. We can accept 1 or 2 units for sample testing order.

Q2: What's your payment terms?

A: We could accept L/C, T/T and Paypal or Western Union, also accept the payment against B/L copy . We can offer credit payment term for our long year cooperated representatives.

Q3: What is the lead time?

A: Sample order: 3-5days, mass production 20-40 days for the formal order.

Q4: Can we put our logo on your products? Is there extra charge for it?

A: Yes, we accept the OEM order based on the order quantity. The color box package need extra cost for less container order.

Q5: What's your warranty?

A: our warranty is 12months limited warranty except the easily worn parts. and for the motor we offer 2 years warranty.

Q6. Which port do you ship your machines?

A: We ship from Ningbo port China. for the FOB price, we will bear the local freight charge and the forwarder fee / customs fee, and all the shipping cost / insurance cost / forwarder cost at destination port / import duty tax ... all will be beared by the buyer (or importer).

Q7. how can i buy your products?

A: if you're final user, please leave your mobile phone number to us, and we will ask our distributor / dealer to call you directly. if you want to be our distributor or representative, welcome to contact us by email or whatsapp. we can talk more details one by one, we're sure you would be satisfied with our quality / service and price.


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