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In hydraulics , and depending on the area of application, pressure levels below 100 bar are classed as low pressure.

Hydraulic pump used in the range between around 20 and 70 bar. These are gear pumps which perform various tasks such as generating a rapid traverse velocity or supplying a control circuit and the like

Characteristic whereby the relationship between two variables is not sufficiently linear, i.e. it does not satisfy the superposition and amplification principle. The term covers non-linear characteris

A transfer element is associated with non-linear behaviour if the relationship between the output and input signal cannot be described by a linear differential equation. Non-linear signal transmitters

whereby the control algorithm is associated with non-linear behaviour, i.e. the input and output for the controller are linked to each other by a non-linear characteristic curve or function.

All oscillations which are not harmonic, i.e. which are not periodic sine oscillations with a given frequency. A typical form of anharmonic oscillation is noise .

Fluid where the shear stress is proportional to the velocity gradient dv/ds: The proportionality factor η is referred to as the dynamic viscosity . Mineral oil is a Newtonian fluid, whereas lubricatin

Pump direction switching

Position assumed by the moving parts of a valve when the actuation energy is switched off ( centre position ).

Measurement for the acid content of a mineral oil . It indicates how many mg of potassium hydroxide are needed to neutralise in 1 g of oil the free acids generated during operation. Since the acid con