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Tech. Information for the QBY Diaphragm Pump(AODD Pump)

WORKING PRINCIPLE                                                                                                                                

   QBY series pump is a diaphragm pump (also known as a Membrane pump, Air Operated Double Diaphragm Pump (AODD) or Pneumatic Diaphragm Pump) is a positive displacement pump that uses a combination of the reciprocating action of a rubber, thermoplastic or teflon diaphragm and suitable valves either side of the diaphragm (check valve, butterfly valves, flap valves, or any other form of shut-off valves) to pump a fluid.
   The QBY air operated diaphragm pumps are driven with compressed air without the need of electric power. Widely used for leak proof applications in industries like petrochemical chemical metallurgy and ceramics etc. Applicable to liquids of leaky corrosive inflammable and explosive & hazardous properties.
   When the volume of a chamber of either type of pump is increased (the diaphragm moving up), the pressure decreases, and fluid is drawn into the chamber. When the chamber pressure later increases from decreased volume (the diaphragm moving down), the fluid previously drawn in is forced out. Finally, the diaphragm moving up once again draws fluid into the chamber, completing the cycle. This action is similar to that of the cylinder in an internal combustion engine.


STRUCTURE AND MATERIAL                                                                                                                      


  1. pump body: Cast iron,Aluminum alloy,Stainless steel,Polypropylene(PP),Polyvinylidene fluoride(PVDF),PTFE lined
  2. pump diaphragm: Nitrile rubber, Neoprene, Fluorubber,Teflon.
  3. sealing ball: Nitrile rubber, Neoprene, Fluorubber,Teflon, Alumina ceramic.
  4. sealing ball seat: Nitrile rubber, Neoprene, Fluorubber,Teflon.


SYSTEM CONNECTION DIAGRAM                                                                                                             


















  1. Toxic, flammable and volatile liquids.
  2. Strong acid, alkali and other corrosive liquids.
  3. Sludge suction from drilled oil wells.  
  4. Oil loading & unloading in oil truck, oil depot and tanks. Paint, resin and dyes & glues.
  5. Ceramic glair, cement slurry and sludge.
  6. Sewage and remnant oil in oil vessels.
  7. Beer brewery and food processing.

 Refer to more information from the Product center.(QBY air opetated diaphragm pump, click here).