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Diaphragm Metering Pumps

A reliable source for Diaphragm Metering Pumps information and leading Diaphragm Metering Pumps 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

Ivyland, PA  |  215-441-0800

Milton Roy has provided quality fluid control and metering pump technologies for more than 70 years to a wide range of customers and industry applications, offering valuable expertise in a broad range of pneumatic, hydraulic actuated, solenoid driven metering pumps and accessories. As the leader in fluid control technologies, our controlled volume metering pumps handle a wide variety of fluids.

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Milton Roy Americas $$$

Pottstown, PA  |  610-489-0900

Liquid Measurement & Controls can provide you with amazing pumps, meters, level controls and other flow control products. Positive displacement pumps, metering pumps, transport pumps and stationary or mobile pumps are just some of the products we have available to our customers. Call today!

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Liquid Measurement & Controls, Inc. $$$

Rochester, NY  |  585-292-8000

Pulsafeeder is a leading metering pump manufacturer —hydraulically actuated diaphragm, mechanically actuated diaphragm and solenoid diaphragm pumps. We serve industries such as chemical processing, pharmaceutical and food processing. We are a unit of IDEX Corporation. How may we help you?

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Pulsafeeder, Inc. $$$

Huntsville, AL  |  256-721-9090

With 120+ years of experience, CDS-John Blue has gained a reputation as a quality supplier of metering pump products, liquid pumps and chemical feed pumps. We provide dependability and versatility, while serving various industries.

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CDS-John Blue Company $$$
placeholder image Milton Roy Americas Liquid Measurement & Controls, Inc. Pulsafeeder, Inc. CDS-John Blue Company

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.

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