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Diaphragm Metering Pumps

A reliable source for Metering Pump information and leading Metering Pump Companies & Manufacturers.

Like all metering pumps, diaphragm models are utilized in many industrial and commercial applications and lauded for their ability to provide consistent fluid input in order to maintain a homogenous process flow even through continuous use. With extremely high accuracy rates, exact amounts of liquid are pumped at predetermined intervals. Read More…

Diaphragm Metering Pumps Diaphragm metering pumps employ flexible membranes to alter the volume of a controlled chamber in order to effectively displace fluids with accuracy and precision.
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Leading Manufacturers

Arlington Heights, IL  |  800-990-7867

Yamada® Corporation has been a leading producer of fluid handling products for over 60 years. As a leader in pneumatic pumping technology, Yamada® is known in industries worldwide for its innovative products, superior quality and unmatched reliability. Yamada’s ISO 9001 certification ensures quality procedures for manufacturing bellows pumps, dampeners and more.

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Yamada America, Inc. $$$

Woburn, MA  |  781-932-3030

Advanced Pump Company is a distributor for over 50 pump manufacturers; products include metering pumps, chemical metering pumps, drum pumps, gear pumps, submersible pumps and more. Call today for metering pump assembly, parts, design, service and repair. We have quick response and delivery.

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Advanced Pump Company, Inc. $$$

Holliston, MA  |  508-429-1440

As a manufacturer of metering pumps, liquid pumps, sealless pumps, dispensing pumps and chemical feed pumps, Iwaki America Inc. provides quality, cost-effective products to a wide range of industries. We also offer drive and control systems, blending and mixing systems and test stands. Call us today to learn more about our metering pumps!

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Iwaki America Inc. $$$

Deer Park, TX  |  713-864-3366

McFarland Pump offers a wide range of pump products. Some of our pump products include metering pumps such as fluid metering pumps, high-pressure pumps, chemical pumps, liquid pumps and positive displacement pumps. We have a range of capabilities; contact us today.

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McFarland Pump Company LLC $$$

Grantsburg, WI  |  800-366-1410

Northern gear pumps provide fluid delivery critical to the performance of multi-million dollar pieces of industrial equipment. We size and shape our pumps for your specific equipment needs. Some examples of the applications addressed by our gear pumps are seal oil, lube oil, fuel oil, hydraulic oil, coating, and many others. For a precise and pulse free metering pump, Northern is the right choice.

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Northern Pump $$$
placeholder image Yamada America, Inc. Advanced Pump Company, Inc. Iwaki America Inc. McFarland Pump Company LLC Northern Pump

This particular type of metering equipment is utilized in the daily operations of aerospace, marine, food and beverage processing, chemical, electronic, mining, petrochemical, material handling and transport, medical, construction, automotive and agricultural industries. The immense capabilities of these liquid meters is demonstrated by their use to transport thousands of gallons of crude oil and fuel while their precision is illustrated by their use in artificial hearts.

Two techniques are used to actuate the stretching and contraction of the diaphragm, the source of displacement. Compressed air is used to stretch the membrane in pneumatic pumps, while other models employ a rod, piston or other mechanical device that is attached to the center of the film in order to push or pull it and change the volume of the adjacent chamber.

Hydraulics may also be used and act similar to pneumatics but with the use of hydraulic fluid rather than air. No matter the actuator, the diaphragm pump is particularly popular as it is low maintenance, has few moving parts and is less prone to leaks than popular piston metering pumps due to the lack seals which are most often the source of leaks due to repeated friction and wear over time.

The design of a positive displacement pump is integral to its success and accuracy. The diaphragm pump is relatively simple in design making it highly reliable. Most often, a single diaphragm is attached to the interior walls of a cylindrical chamber. Clamped or otherwise sealed, this creates an unmoving barrier between the actuating device and the fluid. At the opposite end of the cavity are inlet and outlet connections, both with check valves to ensure the proper flow directionality.

When the membrane is retracted it increases the volume of the chamber, decreasing pressure and effectively creating a vacuum which draws a specified amount of fluid in through the inlet valve. Alternatively, stretching the diaphragm back down towards the fluid increases pressure and pushes the liquid out through the exhaust valve. Variable materials may be used for both the membrane and the housing which keeps it in place.

Materials such as aluminum, stainless steel, cast iron, brass or bronze are used for the holder while ethylene propylene, rubber, plastic and other elastomers are common compositions for the membrane itself. Material selection is extremely important and must take into account the liquids that are to be pumped as they may include waters, oils, solvents, fuel, coolant and acids as well as other hazardous or even toxic materials. Abrasive fluids also require particularly durable diaphragm construction. Additional considerations for diaphragm pumps include maximum flow, maximum pressure discharge, inlet size, exhaust size, media, operating temperature and power source.