Pneumatic Diaphragm Pump

Pneumatic Diaphragm Pump

In the world of industrial fluid handling, Pneumatic Diaphragm Pump, as known AODDP (Air Operated Double Diaphragm Pump), play a crucial role. These pumps are a type of positive displacement pump that uses compressed air as a power source to move liquids. They consist of two flexible diaphragms that move back and forth to create a pumping action, enabling the transfer of fluids. AODD pumps are used in a wide range of industries to transfer various types of fluids, from chemicals and solvents to food products and wastewater.

Pneumatic Diaphragm Pump is a designed to handle a variety of fluids, including those that are abrasive, corrosive, viscous, or shear-sensitive. The primary components of a pump include:

Diaphragms: Flexible membranes that create chambers and move alternately to draw in and push out fluid, enabling continuous flow through the equipment.

Air Valves: Control the flow of compressed air into the pump, driving the movement of the diaphragms.

Inlet and Outlet Manifolds: Channels that direct the flow of fluid into and out of the pump.

Housing and Construction Materials: The pump body, which can be made from various materials depending on the application, such as aluminum, stainless steel, or plastic.

QBK Pneumatic Diaphragm Pump 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.

Model :QBY-15/25/40/50/65/80/100
Imported size:DN15,DN25,DN40,DN50,DN65,DN80,DN100
Rated flow rate(m³/h):1,2.4,8,12,16,24,30
Material:PP, Aluminum, Cast Iron, Stainless Steel. Diaphragm material:NBR, Viton, Teflon, FEP etc.
Membrane material: F46
Maximum head :50m
Connection method: flange, thread

Pneumatic Diaphragm Pump moves fluid by the alternate and repeated back-and-forth movement (strokes) of two flexible membranes or diaphragms mounted on a common shaft (Figure 1). Although diaphragm pumps can be driven directly, with the shaft connected directly to a motor, an air driven double diaphragm pump pump uses compressed air with a sophisticated distribution system directing the air alternately to two air chambers on the opposite sides of the diaphragms.

                                                                             Figure 1 Operation of Pneumatic Diaphragm Pump

How the air distribution system works
The QBK built-in air distribution system incorporates two moving parts: the air valve spool and the pilot spool, which also are the heart parts for the system. The pressurized air start ingressing into one side hole of pilot spool and then trigger the air valve move. It directs pressurized air to one air chamber while exhuasting the other. The air causes the main shaft/diaphragm assembly to shift to one side (discharging liquid on that side and pulling liquid in one other side). When the shaft reach to the end of the stroke, the diphragm plate actuates the pilot spool. The air start ingressing into other side hole of pilot spool then trigger the air valve to otherside too.

Pneumatic Diaphragm Pump has the advantages of most pumps, such as self-priming pump, submersible pump, canned motor pump, mud pump and impurity pump. Conventional liquid and various media that are not easy to flow can be transported.

1. Shut down the switch without flowing water, the suction head reaches 7m, the delivery head reaches 70m, and the outlet pressure is ≥ 6kgf/cm2

2. The maximum diameter of particles in the medium allowed in the pump flow passage can reach 10mm, so when discharging the slurry and impurities, the damage to the pump is very small, and the flow is large and the performance is good.

3. The conveying lift and flow can be adjusted steplessly through the open pneumatic valve (the pneumatic pressure is adjusted between 1-7 kgf/cm2)

4. The pump has no rotating parts and bearing seals. The diaphragm completely separates the discharged medium from the pump operating parts and working medium. The conveyed medium will not leak to the outside. When toxins and flammable or corrosive media are discharged, they will not cause environmental pollution and human safety hazards.

5. It is safe and reliable to use in flammable and other sensitive conditions and exploration sites.

6. The pump can be completely immersed in the medium without affecting its use.

7. The pump is easy to use and reliable. To start or stop, just open or close the gas valve body. Even if there is no medium operation or sudden stop for a long time due to accident, it also has self-protection function. When the load recovers normally, it can also be started automatically

8. Single structure, not easy to damage, convenient for maintenance and installation. The medium delivered by the pump will not contact the matching pneumatic valve and connecting rod.

9. The pump does not need oil for lubrication, even if the lack of medium causes idling, there is no damage to the pump.

The Pneumatic Diaphragm Pump can suck the peanut, pickles, tomato slurry, red sausage, chocolate. hops and syrup, various strong acid, alkali and corrosive liquid ect.

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