A hydraulic pump works by creating a vacuum at the pump’s inlet, which pushes liquid from the reservoir into the pump’s inlet line. The pump then uses mechanical action to push the liquid into the hydraulic system at the pump output. While hydrodynamic pumps can be either fixed displacement pumps, where the displacement (the amount of flow through the pump per rotation) cannot be changed, or variable displacement pumps, which have a more intricate design that permits the displacement to be changed, hydrostatic pumps are positive displacement pumps. In daily life, hydrodynamic pumps are more common. Pascal’s law is the basis for the operation of all sorts of hydrostatic pumps.

Gear pumps function smoothly, have very few moving parts, and perform exceptionally well at pressures of about 210 bar. This pump has a maximum speed of 3000–6000 rpm.

Gear pump type:

Large flows are handled by hydraulic piston pumps at high hydraulic system pressures. Applications include industrial, offshore, maritime, and mobile construction equipment.

Piston pump types include:

The flow pulsation of hydraulic vane pumps is substantially smaller, meaning that the flow is steady. As a result, vane pumps continue to run at high speeds with reduced noise.

Vane Pump Type: