| External Gear Pump |
Approximately 0.25–400 cm³/rev |
Approximately 100–250 bar continuous; higher ratings are available in specialized designs |
80–90% |
Fixed displacement; flow is directly related to shaft speed |
Simple construction, compact size, low purchase cost, good tolerance of basic operating conditions |
Higher noise and pulsation than many piston pumps; lower efficiency at high pressure and low speed |
Mobile equipment, agricultural machinery, material-handling systems, lubrication circuits |
| Internal Gear Pump |
Approximately 1–1,000 cm³/rev |
Approximately 100–300 bar, depending on the design |
85–93% |
Fixed or variable displacement; smooth and relatively low-pulsation flow |
Lower noise than many external gear pumps, good suction capability, smooth delivery |
More sensitive to contamination and manufacturing tolerances; generally less suitable for extreme pressure than piston pumps |
Industrial power units, presses, injection equipment, and low-noise hydraulic systems |
| Vane Pump |
Approximately 5–250 cm³/rev |
Approximately 70–210 bar continuous |
80–92% |
Fixed or variable displacement; smooth, low-pulsation output |
Quiet operation, good flow consistency, suitable for moderate-pressure applications |
Vanes and cam-ring surfaces can be affected by contamination; pressure capability is usually below that of piston pumps |
Machine tools, industrial automation, packaging machinery, and moderate-pressure power units |
| Axial Piston Pump |
Approximately 10–1,000 cm³/rev |
Approximately 250–450 bar continuous; peak ratings may be higher |
90–97% |
Fixed or variable displacement; excellent control of flow and power demand |
High pressure capability, high efficiency, strong power-to-weight ratio, precise variable-flow control |
Higher cost and complexity; requires clean fluid, correct filtration, and careful installation |
Construction machinery, hydrostatic drives, mobile hydraulics, injection molding, and high-pressure industrial systems |
| Radial Piston Pump |
Approximately 0.5–2,000 cm³/rev |
Approximately 300–700 bar, depending on configuration |
88–96% |
Usually fixed displacement; very high-pressure flow with low speed capability |
Very high pressure capability, good volumetric efficiency, suitable for high-load and intermittent duty |
Heavier and more expensive; often higher flow pulsation and lower maximum speed than axial piston pumps |
Hydraulic presses, clamping systems, test rigs, forging equipment, and high-force applications |
| Screw Pump |
Approximately 5–1,500 cm³/rev |
Approximately 50–150 bar, depending on screw design and fluid viscosity |
75–90% |
Fixed displacement; exceptionally smooth, quiet, and low-pulsation flow |
Very low noise, low vibration, continuous flow, and good performance with high-viscosity fluids |
Limited pressure range for many designs; can be sensitive to dry running and abrasive contamination |
Noise-sensitive industrial systems, lubrication, cooling circuits, and fluid-transfer applications |
| Bent-Axis Piston Pump |
Approximately 20–1,000 cm³/rev |
Approximately 250–450 bar continuous |
90–97% |
Fixed or variable displacement; efficient at high pressure and a wide speed range |
High efficiency, robust construction, strong starting torque, and good suitability for hydrostatic transmissions |
Longer installation envelope, higher cost, and more complex alignment requirements |
Mobile drives, winches, hydrostatic transmissions, marine systems, and high-power machinery |
| Electro-Hydraulic Variable Pump Unit |
Commonly 5–250 cm³/rev pump displacement |
Approximately 100–350 bar, depending on the integrated pump technology |
85–95% |
Electronically controlled variable flow; supports pressure, load-sensing, and motion-control strategies |
Precise control, energy-saving potential, programmable operation, and easy integration with automation systems |
Higher system complexity; requires compatible sensors, controls, wiring, and commissioning |
Smart machinery, robotics, injection molding, automated presses, and energy-efficient hydraulic systems |