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In general : Determination of a physical variable of a process and further use at another point. This is generally a feedback control, but may also be data collection, for example. In control technolo

Test method for determining the filtration efficiency in general ( retention rate, filtering grade ). This involves passing a specific mineral oil contaminated with quartz sand ( Air Cleaner Fine Test

Reaction force generated if a fluid flow changes direction and/or velocity. The force F acts on the fluid from the outside as a supporting force. The force exercised by the flow on the environment is

Takes into account along with the compressibility of the pressure fluid also the elasticity of the surrounding components as well as the connection line between the valve and . The equivalent bulk mod

without auxiliary energy, which converts an input signal into an with the same physical properties and a value range suitable for the downstream elements. Example: Voltage converter, electrical potent

Reversal of a pulse valve by purging (depressurising) the piloting line. Not used very often now, because switching may also occur in the event of an unintentional pressure drop.

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

Depending on the relative speed of the contact area and the lubrication condition, the friction displays non-linear behaviour, which can be attributed to characteristic mechanisms of action. A distinc

Comparative signal; a target course is simulated and an attempt is made to come as close to the reference signal as possible through a corresponding setpoint control.

Adjustability of a hydrostatic transmission based on a combination of a pump and motor with adjustable geometric displacement. This ensures the highest rotation speed range is achieved with a good lev