What is a Double Diaphragm Pump?

It would almost take a college level mechanical engineering course to fully explain a double diaphragm pump, but we can give you the basics. Double diaphragm pumps work by pumping fluids, solids, or any mixture thereof with two separate reciprocating diaphragms. Due to the alternating pump mechanisms of the separate diaphragms, the double diaphragm pump produces a flow that is much more even than that from single diaphragm pumps.

Double diaphragm pumps are usually air-driven, which allows them to be used in gaseous or chemical-laden environments where a spark from an engine or electric motor could cause an explosion or fire. The two diaphragms are connected to a piston and each seal off a separate displacement chamber.

When a diaphragm moves to expand the area in a chamber, it lowers the air pressure and fluids flow into it through the suction valve, which is lifted off its seat by the product flow and closes at the end of the stroke by gravity. When the diaphragm contracts the area in the chamber, it forces the fluids out the chamber through the delivery valve which is an identical ball and seat non-return valve. Double diaphragm pumps are classified as positive displacement pumps, which means the cavities expand and contract to move fluids.

Advantages of the double diaphragm pump are that they are seal-less, oil-free, have a steady flow, have good suction lift characteristics, and can handle almost any kind of material, including abrasive, as well as corrosive chemicals. This makes them very good for highly viscous liquids, sludges, and slurries. They can be used for industrial, chemical, and even hygienic applications. The fact that they are air-driven allows them to be used in environments which would contra-indicate many other types of pumps.

Double diaphragm pumps can be used in places where there isn’t enough space or accessibility for other pumps. They can also be used in places with no electrical power. Some are now being used for gas well applications. The main disadvantages are that they are not very energy efficient, and their output pulsates.

Although double diaphragm pumps are not complicated, it is wise to call a professional for advice if you need to make a decision about which kind of pump to use. There are various pumps that work well for many different applications. Call us today at (08) 9408 1544. We have been in business for 22 years, and have a wealth of combined experience among our employees.

If you explain your situation, we can find the right pump for your needs.