Checkball Piston Pumps

High Pressure Pumps for Difficult Conditions

Individual piston check valves direct flow from the inlet side of the pump to the outlet port in these high pressure hydraulic pumps. The positive-seating checkball valves provide better wear and high volumetric efficiency, especially at high pressure. These checkball pumps operate at pressures to 20 000 psi (1380 bar).

Checkball Pump Operation

During checkball pump operation, a fixed-angle wobble (cam) plate rotates with the drive shaft, causing the pistons to reciprocate. During its suction stroke, each piston is filled through its inlet check valve. During compression, the inlet check valve closes and pressure in the pumping chamber rises until it exceeds load pressure. The outlet checkball then lifts off its seat and fluid is pumped out of the chamber.

Checkball Pump Advantages

The checkball pump design is ideal for hydraulic systems with demanding conditions including:

  • pressure spikes
  • contamination
  • dirty environments
  • special fluids
  • extreme temperatures
  • long duty cycles

These high pressure pumps accommodate more force in a smaller package. At lower pressures, the pumps provide the life and performance margin essential in critical environments.

See more pump benefits below.

Pump Specifications

Fixed displacement pumps -
Flows from 0.22 to 60 U.S. gpm (0,83 to 227 L/min) at 1800 rpm,
Pressures to 20 000 psi (1380 bar)
Variable delivery pumps -
Maximum flows from 12.7 to 60 U.S. gpm (48,1 to 227 L/min) at 1800 rpm,
Pressures to 8500 psi (590 bar)

Dynex Checkball Pump

Learn more about hydraulic pumps for these applications:

High pressure pumps for operation from 6000 to 20 000 psi (420 to 1380 bar).
Oil and gas industry pumps for use with water glycol or mineral oil on wellhead control systems and torque-tool power units.
Pumps for special fluids, with a wide range of viscosities and operating temperatures. Fluids include phosphate ester, calibration fluids, and various water-based and fire-resistant fluids.
Multiple-outlet pumps for simplified multiple-function circuits without flow dividers.


Ten Benefits of Using These
Hydraulic Pumps

1. High pressure pumps operate to
20 000 psi (1380 bar) 
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2. Efficient pressure compensation to
8500 psi (590 bar) 
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3. Check valves provide less wear,
lower starting torque 
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4. Contamination tolerant pumps for
dirty environments 
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5. Simplified multiple-function circuits
without flow dividers 
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6. Operate within a wide range of viscosities
and temperatures 
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7. Compatible with low-lubricity and
other special fluids 
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<8. Single-fluid design eliminates fluid
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9. Smooth, quiet operation with resistance
to cavitation damage 
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10. Bi-directional shaft rotation reduces pump
stocking requirements 
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– Printer Friendly Pump Benefit List –