Shop Air-Driven Liquid Pumps

Air driven liquid pumps operate on the principle of differential working areas. An air piston drives a smaller diameter plunger or piston to provide a pressure ratio.The pressure ratio is the method of determining maximum outlet pressure available. Our liquid pumps operate at a drive air pressure of 12-150 psi (0.8-10 Bar) and will cycle automatically when compressed air is first applied to the drive. It will start cycling at its maximum speed thus producing maximum fluid flow. At this stage, the pump is acting as a transfer pump, filling the pressure system with fluid. As resistance increases in the system (creating back-pressure to the pump), the pump will decrease its reciprocating action. Back-pressure in the system finally balances with the incoming air drive pressure times the ratio. At this point, the pump will stall and maintain pressure without consuming any energy. If there is further demand on the system for flow, 

the pump will automatically start cycling again.


Click on the image of the pump below to view all pumps in that series. 
To view our Air-Driven Liquid pumps by pressure instead of series, CLICK HERE.

Shop 3L Series Pumps

  • Maximum Outlet Pressures 1,200psi to 15,000psi

  • Max Displacement per Cycle 0.82in3 to 0.03in3

Shop 5L Series Pumps

  • Maximum Outlet Pressures 1,500psi to 80,500psi

  • Max Displacement per Cycle 4.42in3 to 0.36in3

Shop 7L Series Pumps

  • Maximum Outlet Pressures 1,250psi to 20,000psi

  • Max Displacement per Cycle 41.4in3 to 2.8in3

With these pumps, as you increase pressure, you will decrease flow. If the pump flow is not high enough,

you may need to increase to the next pump frame size. For a helpful overall guide, see the chart below.
To view our Air-Driven Liquid pumps by pressure instead of series, CLICK HERE.