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Positive displacement pumps serve a purpose in nearly every market, and every application. We've covered many other positive displacement pumps in our "Quick and Dirty Guides", including external gear, internal gear, peristaltic, and rotary lobe pumps, this week we'll discuss the Air-Operated Double Diaphragm (AODD) pump. We'll uncover how they work, what they're great for, disadvantages, and some of their best applications. Read on!
AODD pumps are a type of positive displacement pump that uses the reciprocating action of elastomeric diaphragms and check valves to pump a fluid. Ball or flap check valves are commonly used, and the solids passing requirements of the application will determine which one to use.
HOW IT WORKSThese pumps use a simple air-valve system to move the diaphragm rod. Flexible diaphragms are round discs (shown in white) attached at each end of the diaphragm rod. The pilot spool (middle of the three horizontal rods) is pushed back and forth whenever the diaphragm rod reaches the end of its throw. This action allows air to move the air distribution valve (top rod in the drawing) back and forth. The air distribution rod controls air flow to the left or right air chamber, reversing on each stroke. The four ball (or flap) valves are operated by pressure differences in the pumped liquid.
It's obvious that AODD pumps could be a great solution for just about any application. Think it might be right for yours? Make sure you get the right pump for the job by talking to an experienced engineer.
If you need help selecting the right pump for your application, ask us about it! We gladly provide technical assistance to businesses in Wisconsin and Upper Michigan.