Diaphragm Pump Buyers Guide

A diaphragm pump (also known as a Membrane pump, Air Operated Double Diaphragm Pump (AODD) or Pneumatic Diaphragm Pump) is a positive displacement pump that uses a combination of the reciprocating action of a rubber, thermoplastic or teflon diaphragm and suitable valves either side of the diaphragm (check valve, butterfly valves, flap valves, or any other form of shut-off valves) to pump a fluid.

There are three main types of diaphragm pumps:

  • Those in which the diaphragm is sealed with one side in the fluid to be pumped, and the other in air or hydraulic fluid. The diaphragm is flexed, causing the volume of the pump chamber to increase and decrease. A pair of non-return check valves prevent reverse flow of the fluid.

  • Those employing volumetric positive displacement where the prime mover of the diaphragm is electro-mechanical, working through a crank or geared motor drive, or purely mechanical, such as with a lever or handle. This method flexes the diaphragm through simple mechanical action, and one side of the diaphragm is open to air.

  • Those employing one or more unsealed diaphragms with the fluid to be pumped on both sides. The diaphragm(s) again are flexed, causing the volume to change.

When the volume of a chamber of either type of pump is increased (the diaphragm moving up), the pressure decreases, and fluid is drawn into the chamber. When the chamber pressure later increases from decreased volume (the diaphragm moving down), the fluid previously drawn in is forced out.[3] Finally, the diaphragm moving up once again draws fluid into the chamber, completing the cycle. This action is similar to that of the cylinder in an internal combustion engine.

Below you will find manufacturers representatives who handle a wide array of Diaphragm Pumps. For specific manufacturer please use the Pumps By Manufacturer section on the top navigation bar.


Burlington Pump

Diaphragm Pumps

A favorite of process professionals everywhere, Ingersoll Rand/ARO Diaphragm Pumps provide stall-free, ice-free operation in 3/8" thru 3"fluid ports. Backed by a five-year warranty, we have the most reliable pump line on the market today.

  John Brooks Company
AODD pumps

Diaphragm Pumps

The air-operated double-diaphragm pumps (AODD pumps) are ideal where water or a particulate mixture needs to be moved in a hurry, and is driven by compressed air. Wilden pumps are versatile, and a single pump can deliver a wide range of flow rates and outlet pressure. Originally adopted by the construction and mining industries for pumping slurries, cement and mud, double-diaphragm pumps rapidly became popular in other sectors.

John Brooks Company also supplies diaphragm pumps from SandPIPER

  Metex Corporation

Diaphragm Pumps

Metering Pumps, diaphragm metering pumps, chemical metering pumps, peristaltic metering pumps, diaphragm metering pumps and electronic metering pumps from the world's leading metering pump manufacturers.

Metering pumps from Walchem, Neptune Chemical Pump, A&F Machine, Blue White Industries, LMI Metering Pumps and Stenner Pumps are shown in this section.

  Vissers Sales Corp

Diaphragm Pumps

Diaphragm Pumps, from the world's leading manufacturers - All-Flo, and CH&E available at Vissers Sales Corp.


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Process News bi-weekly newsletter is sent out every second Tuesday to over 45,000 readers worldwide. Process News was designed to make it easy to obtain product information, get quotes, contact manufacturers or their representatives. The pages that follow contain the latest information supplied to us from manufacturers and their representatives on new products or services offered to the process controls and instrumentation market. Twice per month the Process News newsletter will be sent to you from Process Controls and Instrumentation. Each newsletter will contain the latest up-to-date product information available. Click Here to see the latest newsletter.

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Process Controls and Instrumentation provides an indepth Buyers Guide of products. We provide a Company Directory of manufacturers and representatives. We offer an Industrial Pump Directory and offer a Product Site Directory and a Directory of Pumps By Type. We provide a section of easy to understand Process Control Terminology. We provide a Video Library of videos on the latest products. We offer a section on Web Site Design and Advertising Opportunities on this web site.

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