Diaphragm Pump

What is diaphragm pump and how does it work?

Diaphragm pumps are positive displacement pumps commonly used in wet commercial pumping applications. Air diaphragm pumps operate on compressed air and transport grout, solvents and other high viscosity liquids.


Pneumatic diaphragm pump has four kinds of materials: engineering plastics, aluminum alloy, stainless steel, cast iron. Air operated diaphragm pump according to different liquid medium respectively using nitrile rubber, neoprene rubber, fluorine rubber, polytetrafluoroethylene, poly forty-six ethylene.


The working principle of double diaphragm pump is a positive displacement reciprocating pump that relies on the air compressor to input compressed air into the distribution valve of the diaphragm pump to drive the link shaft in the middle body of the diaphragm pump to drive the diaphragm pump diaphragm in the medium chamber of the diaphragm pump body to do transverse stretching to achieve the role of self-priming fluid. In the two symmetrical working chamber of the pump, each equipped with a piece of elastic diaphragm, the link rod will form a body of two diaphragm, compressed air from the pump inlet joint into the distribution valve, to promote the diaphragm in the two working chamber, driving the two diaphragm joint synchronous movement. At the same time, the gas in the other working chamber is discharged from the pump behind the diaphragm. Pneumatic diaphragm pump by the flow structure and liquid flow structure of two major components, through the two sides of the diaphragm completely isolated.


Air pressure only needs to be greater than two kilograms per square centimeter to work. At 5 to 8 kg working pressure, the high pressure gas in the valve chamber drives the connecting rod shaft to reciprocate left and right through the air flow dredging system, and the consumed low pressure gas is discharged quickly through the exhaust port. Under the alternating action of high and low pressure gas on both sides, the connecting rod shaft drives the diaphragm on both sides to move around, so that the air pressure in the volumetric cavity on both sides changes alternately, so as to realize the continuous suction and discharge of liquid.


Pneumatic diaphragm pump is also called air operated diaphragm pump, double diaphragm pump or aodd pump. It is a new type of conveying machinery, using compressed air as power source, for all kinds of corrosive liquids, with particles of liquid, high viscosity, volatile, flammable, highly toxic liquid, can be suction.

With compressed air as the power, the diaphragm reciprocating deformation caused by volume change of the positive displacement pump, its working principle is like the plunger pump.

  1. Pump peanut butter, pickles, mashed potatoes, sausage, jam, applesauce, chocolate, etc.
  2. Pump paint, gum, pigment.
  3. Adhesive and glue, all kinds of suction pump.
  4. All kinds of tile, porcelain, brick and pottery glaze slurry.
  5. After the well is drilled, the sediment and grouting are pumped.
  6. Pump all kinds of emulsions and fillers.
  7. Pump all kinds of sewage.
  8. Use pumps for tankers, barges to clear and absorb the sewage in the bin.
  9. Dilute pulp of hops and baking powder, syrup and molasses.
  10. Pump water in mines, tunnels, tunnels, ore dressing and slag. Pump suction cement grout and mortar.
  11. All kinds of rubber pulp.
  12. All kinds of abrasives, corrosive agents, oil and mud, cleaning oil scale and general containers.
  13. All kinds of highly toxic, flammable and volatile liquids.
  14. All kinds of strong acid, strong alkali, strong corrosive liquid.
  15. all kinds of high temperature liquid up to 150℃.
  16. As a pressure delivery device for all kinds of solid-liquid separation equipment.

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About HAOSH Pump

HAOSH‘ is a major dosing metering pump brand of Shanghai GL Environmental Technology Co., Ltd. Also as a pump category super market, we supply diaphragm pumps, chemical pumps, water pumps, screw pumps, etc. Since founded in 2007, HAOSH brand has for more than 100 countries of the world’s more than 3000 clients with high quality pumps.