More about Diaphragm Pumps

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Diaphragm pumps are hydraulically or mechanically actuated positive displacement pumps designed to handle a variety of pressures and flow rates. More plainly, they are pumps that use the up-and-down movement of a cupped, elastic surface to generate liquid flow. This surface, found within the pump, is typically made from polytetrafluoroethylene (PTFE), Teflon, synthetic rubber or a similar material. When the surface is pushed into the liquid, it adds pressure and displaces a certain amount of fluid. When it is pulled back from the liquid, it draws in more fluid. The diaphragm pump uses check-valves to prevent the backflow of fluid through the entry valve.

Diaphragms pumps incorporate either hydraulic fluid or pistons to control the movement of the diaphragm. Low-lift, low pressure pumps are design to handle thick, viscous liquids, such as slurries or heavy oils, while others are engineered for high-flow applications and high-pressures. Teflon diaphragm pumps, for instance, are used for high-precision, high-pressure industrial applications.

Among the key features of diaphragm pumps are their ability to run dry for prolonged periods without incurring damage. This trait is due to the minimal amount of friction within a diaphragm pump, and most wear is caused by the transported fluid rather than the action of the pump. Heavy duty pumps are designed to withstand extremely thick, sometimes corrosive liquids, although the proper housing material is required for such uses. Various plastics and metal (i.e., aluminum and stainless steel) are typically employed as housings for the pump.

Virtually all major industries utilize diaphragm pumps, which is a good indication of their versatility and durability. They have obvious distilling, oil-transport and food processing applications, but they are also common in automobiles and aircrafts. They are even used by the biomedical industry, and can be found in certain artificial hearts. More commonly, they are used to move abrasive fluids, including concrete, or acids and chemicals.