What is an Air-Operated Double-Diaphragm pump?

An Air-Operated Double-Diaphragm pump (AODD) is a sort of positive displacement (PD) pump. It comprises of two pumping chambers that are on the other hand filled and released by the development of adaptable diaphragms. Packed air is on the other hand bolstered to, and vented from, air chambers on the contrary sides of the diaphragms to make the pumping activity. AODD pump is commonly utilized for exchange applications and can deal with a wide assortment of feeds including mucks, slurries, grating and shear touchy liquids. In spite of the fact that they are vigorous, dependable and simple to keep up they can be uproarious, inclined to icing, and are constrained to low-pressure applications.

How does an AODD pump work?

An AODD pump moves liquid by the substitute and rehashed forward and backward development (strokes) of two adaptable films or diaphragms mounted on a typical shaft (Figure 1). Despite the fact that diaphragm pumps can be driven straightforwardly, with the pole associated specifically to an engine, an Air Operated Double Diaphragm pump utilizes packed air with a complex dissemination framework coordinating the air then again to two air chambers on the contrary sides of the diaphragms. Figure 1 demonstrates a total cycle of an AODD pump:

1. The compressed air control system directs air to air chamber. 

2. The shaft moves to the left, and the movement of the diaphragms increases the volume of pumping chamber and, at the same time, reduces the volume of pumping chamber. Valves on either side of the pumping chambers ensure that fluid flow through the pump only occurs in one direction: from inlet to discharge. The effect is to draw fluid from the inlet into second chamber, and discharge it from first chamber. 

3. As the shaft completes the stroke, the air distribution system vents air chamber and directs the compressed air to air chamber. 

4. The shaft now moves to the right, reducing the volume of pumping chamber and, at the same time, expanding the volume of pumping first chamber. Fluid is now discharged from chamber, and drawn into first chamber.  Click here to know more about diaphragm pump.

5. As the shaft completes the stroke, the air distribution system vents air chamber and the cycle repeats when compressed air is directed to first air chamber again.

What are the main features and benefits of an AODD pump?

AODD pumps are basically sans leak. There are just stationary seals between the wetted parts and the outside condition so leakage can possibly happen on the off chance that one or the two diaphragms fall flat. As a component of a general upkeep program, diaphragms ought to be supplanted consistently, as per the maker's suggestions. Diaphragms endure less wear in an AODD pump than those in a mechanically determined diaphragm pump as a result of the advantage of pressure adjusting by the compacted air supply. Get more information about double diaphragm pump here.

AODD pumps are capable of handling abrasive, highly viscous fluids, sludges or slurries. In addition, the gentle pumping action makes them ideal for shear-sensitive fluids. The four internal check valves by and large use either a ball (or cone)/seat or fold plan. Ball valves give a superior seal and are less inclined to wear than fold plans. Since fold type valves are hinged, long haul use in the end causes weakness at the flexing point. Ball valves wear more equally since the ball is allowed to pivot during activity and settle in an alternate position on the seat. Fold type check valves have the preferred standpoint that they can more effectively pass vast solids entrained within the pumped liquid.

With no internal seals or moving segments requiring lubrication and cooling, an AODD pump can be run dry indefinitely without harm. AODD pumps are self-priming and some are capable of a suction lift of up to 8m.AODD pumps are reasonable for use in dangerous areas in view of the utilization of compacted air as the power source rather than power. For a similar reason, an AODD pump can be securely submerged - as long as the air vent is over the fluid dimension. Click here to know more about diaphragm pump india.