Diaphragm Pumps

PRODUCTS > Diaphragm Pumps

Thompson’s diaphragm pumps are capable of quick, dry self-priming down to 20 feet.

They can run dry indefinitely as no rotating part comes in contact with any liquids. Thompson’s diaphragm pumps are designed to be highly resistant to abrasion and handle liquids containing a large percentage of sand, solids and stringy, fibrous materials. The parts subject to wear and aging, such as diaphragms and check valves, are easily replaced. The pump is equipped with an external operating version (EOV) which provides a run time of up to 100 hours.



Thompson’s Diaphragm pumps are equipped with a spring-loaded connecting rod which activates if irregularly shaped solids block the diaphragm downstroke. When the pump restarts, the spring operates for a few strokes until the material is remixed with the liquid.


  • Flows up to 140 gpm
  • Discharge heads up to 50 feet
  • Suction lift up to 20 feet
  • Solids handling up to 2.375 inches
  • Automatic dry priming allows for indefinite running without harm
  • EOV run time up to 100 hours
  • Air cushion chamber reduces pulsation in suction line
  • Self-lubricated bearing allows continuous operation without service for 5,000 hours
  • High resistance to abrasives and corrosive liquids
  • Oversized check valves prevent clogging
  • Parts subject to wear are designed for quick and easy replacement


Consult factory for other versions & options.

Unit Model Size (In.) Max Head (Ft.) Max Capacity (GPM) Max Solids (In.)
2D 2 41 80 2
3D 3 50 88 2.375
4D 4 50 140 2.375


These pumps are available skid-mounted or trolley-mounted.