The optimum hydraulic pump for any application

The type of design means the flow is not completely free of pulsation. On the other hand, this form of construction makes gear pumps very robust, cost effective and low maintenance.

In an axial piston pump, the piston rods are arranged in a circle on a swash plate and can move freely in a ball cup bearing. When the swash plate rotates, the opposite ends of the pistons rotate past the hydraulic oil inlet and outlet. All the piston rods move continuously due to the tilted surface of the swash plate. The greater the angle of tilt, the further down the cylinders the piston rods move and the higher is the resulting volumetric flow. Axial piston pumps are available in two versions: bent axis pumps with a fixed volumetric flow and variable pumps which allow the volumetric flow to be regulated. Their more technically complex design results in higher procurement costs and greater energy consumption.

Radial piston pumps work in a similar way to axial piston pumps. With radial piston pumps, however, the pistons are not arranged parallel to the drive axis but radially in a circle around it. The pump cylinder block is offset from the shaft axis. The resulting eccentric motion creates the pumping effect. Radial piston pumps can create very high pressures and are very efficient. However, they need to be solidly constructed to withstand the high pressure and therefore require more installation space.

Vane pumps work efficiently, cause only slight pulsations and are very quiet. Compared to other pump types, they are subject to high wear and therefore require more maintenance.