Diaphragm Pumps vs. Centrifugal Pumps: What are the Differences?

Murzan Pumps

Murzan Diaphragm Pump.




Fristam Centrifugal Pump

All types of pumps perform that same basic function: transferring fluid from one place to another. But that doesn’t mean there aren’t critical differences to consider. We offer this primer on pumps to help you make the most informed buying decision possible.

Diaphragm Pumps: How They Work

Two flexible diaphragms, connected by a center rod, operate in unison to create continuous pumping action. Compressed air alternately is applied to the back of each diaphragm, creating positive or negative pressure in the corresponding chamber.

Reciprocating back and forth draws in fluid to one chamber while expelling fluid from the other. As one diaphragm moves outward from the chamber, it lowers pressure and fluid rushes in. At the same time the other diaphragm pushes inward, increasing pressure so fluid flows out.

One-way check valves ensure that fluids flow in one direction only. Chamber size and air pressure determine suction and discharge rates.

An extensive number of construction materials are available, allowing diaphragm pumps to handle any fluid—from potable water and volatile solvents to sludge. That versatility means they are used in virtually every industry requiring fluid transfer. That said, diaphragm pumps are a top choice for many process industries including sanitation, given they can handle liquids with high levels of contaminants and solids.


Centrifugal Pumps: How They Work

Impellers transfer rotary velocity from the motor to the liquid, generating pressure and pushing liquid through the discharge port. Pump strength is increased by adding faster, larger or more impellers, depending on the viscosity of the liquid and flow rate needed.

Centrifugal pumps are the most common type of pump used in sanitary and industrial settings and ideal for high-volume fluid transfer. They often are seen in treatment plants, irrigation systems, and petrochemical and food and beverage production. Centrifugal pumps are most often associated with water transfer but are equally effective handling other liquids, fuels and chemicals.

Lincoln Suppliers is dedicated to stocking top brands of diaphragm pumps and centrifugal pumps. Our knowledgeable staff understands every model—helping your business make the most informed buying decision possible. Want to learn more? Give our team a call at 800-622-8425 or request a free quote today.