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Liquid diaphragm pumps are the first choice for moving demanding fluids gently without any system downtime. Many industries require diaphragm liquid pumps for controlling the movement of liquids in their high tech devices to ensure maximum efficiency, reliability, and accuracy of the device.

Benefits of Thomas’s Liquid Diaphragm Pumps

Thomas liquid diaphragm pumps provide high efficiency of operation along with continuous liquid flow with minimized pulses. Thomas diaphragm pumps deliver smooth, bubble-free transfer of media.

Our extensive liquid diaphragm pumps portfolio covers flow ranges from 0.0063 cfm (180 ml/min) to more than 0.0635 cfm (1,800 ml/min), operating pressures up to 58 psi (4 bar) and suction height up to 18 in Hg (6 m H2O)

In addition, customers can choose various head configurations for high volume requirements. We offer different motor options, including an extensive range of brushed and brushless DC motors. Depending on the type of liquid, you can choose pump components in the most suitable material, such as EPDM, FKM, PTFE or FFKM.

Liquid Diaphragm Pumps for Different OEM Devices

Oil-less Thomas liquid diaphragm pumps are remarkably robust and offer long-term compatibility with superior resistance to chemical or mechanical stress and a long maintenance-free life. These self-priming pumps are suitable for pumping fluids against high system pressure, as well as precisely dosing, dispensing or aspirating of a wide range of fluids. They stand out on the market with their excellent reliability and durability even with corrosive and abrasive media.

Thomas is proud to offer a portfolio of products that provide premium quality, maximum efficiency as well as reliability and accuracy. Our portfolio present 8 series that can be customized in virtually any way.

This is the reason why market leading device manufacturers in many industries choose Thomas products. Our pump reliability engineering provides lifetime results 4x faster than conventional testing procedures. That’s why our extensive R&D efforts and innovations have made us one of the leading suppliers of liquid diaphragm pumps.


Featured Applications Using Liquid Diaphragm Pumps


  • Printing
  • In-Vitro Diagnostics

How Liquid Diaphragm Pumps Work?

In liquid diaphragm pumps, a flexible diaphragm is moved through the action of an eccentric on the motor shaft. On the down stroke, the medium is drawn into the pump chamber and expelled on the upstroke. Internal valves mounted within the pump head function as check valves and control the direction of flow.


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