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The viscosity of a Newtonian fluid changes as a factor of the temperature: For hydraulic fluids it decreases rapidly as the temperature rises and at low temperatures it approaches the pour point ( Fig

To bring a certain order to the highly different viscosities of conventional mineral oils they are grouped into classes with a defined bandwidth (according to DIN 51 519 = ±10 %). Equally, the viscosi

Characterises the Viscosity/temperature characteristic of a fluid. The smaller the change in viscosity with respect to temperature, the higher the VI (CETOP RP 100). The VI is mathematically calculate

Macromolecular materials used to achieve a flatter VT characteristic curve. Due to their long length, the molecules of the viscosity index corrector are shear sensitive such that their effect subsides

Describes the increase in viscosity of mineral oils given increasing pressure . This increase gets bigger as the nominal viscosity increases (= viscosity/pressure characteristic at +50°C or recently +

Range within which the viscosity of a hydraulic fluid satisfies the requirements placed on it. It is defined by operating conditions.

Valve with four controlled ports. For directional valves: Inlet, cylinder side A and B, outlet.

Directional valve that has a 4th switching position in addition to the three standard positions. The 4th position can be used to solve particular tasks, such as a fail safe position in the case of a f

Operating modes of drives

Construction design of an axial piston pump , in which the swash plate and the control disc are firmly connected to the drive shaft and rotate with it, while the cylinder block, which is firmly connec