Power steering units are devices installed to help machines’ drivers steering. They are developed to increase the steering power of the wheel, while considerably reducing the human physical effort when driving.
Hydraulic power steering systems work multiplying the torque inputs applied from the driver on the steering wheel to the vehicle's road wheels through an actuator, typically a cylinder.
The hydraulic pressure usually comes from a gerotor or rotary vane pump driven by the vehicle's engine.
The gerotor, which has the function of volumetric dosing unit, releases an oil amount proportional to the turning angle made by the steering wheel, that governs the valves in order to address the proper flow to the cylinder.
The more torque the driver applies to the steering wheel and column, the more fluid the valves will allow to course through the cylinder, and the more force will be applied to steer the wheels.
Anyway when the steering system works in hydraulic mode, the torque requested to the driver on the steering wheel is very low since the necessary power is provided by the pressing/flowing fluid. This allows an easier and reliable directional machine control.
Should occur a case of emergency, the steering unit will work as a manual pump, letting the operator control the vehicle.

Ognibene Power steering units can be installed on both low and high power vehicles, may be completely customized according to specific needs, guarantee a reliable performance and a safe and comfortable driving experience.

There may be many different configurations for every steering unit model, according to the kind of displacement and pressure load required by the vehicle. 

In addition, each steering unit can be equipped with one or more valves (e.g. check valves, shock valves, suction valves, etc.) in order to improve the performance of the vehicle.

They can be categorized according to their peculiarities in: