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well as in aerospace. It was used to automate work processes, to simplify machine designs and to increase performance. Even though fluid technology was of varied application and was an important specialist [...] only started to become used widely in industry in the middle of the 20th century. Prior to that it was mostly in special applications where the benefits of fluid technology were used, for instance in pneumatic [...] specialist area for mechanical engineering, up to this point it was not a subject at colleges and universities – unlike electrical engineering. As a consequence up until the 1970s hydraulic components and systems

Directional valve with a second tank connection. This design was very popular for a long time, as on the one hand it was possible to place different loads on the two connections and on the other hand special

The European Committee for Oil Hydraulics and Pneumatics was founded in 1962. Over 700 businesses from 13 European countries are represented in CETOP by the national fluid technology associations. The [...] EU directives and to harmonise ideas at European level. Long before the responsible ISO committee was founded, CETOP published technical recommendations for fluid technology. Today CETOP still has a leading

Ability of a valve to transfer signals at a defined frequency. To quantify the valve dynamics, it was agreed to investigate the valve system with sinusoidal signals. Thus valve dynamics can be described

there over a corresponding code track, which state the respective angle around which the coded disc was turned from its neutral position.

under defined conditions. In the course of adapting to international standards, the setting point was replaced by the pour point . The setting point is approximately 5°C to 7°C lower than the pour point

of impulses of different strengths, but by encryption using a binary code. The sampling frequency was internationally set at 8 kHz and the number of amplitude values is limited to 256 (8-Bit codeword)

its viscosity . The relationship between flow rate and pressure difference is a linear one. This law was discovered by Gotthelf Hagen in 1839 and shortly afterwards (independently) by George Gabriel Stokes

usual parameter for viscosity. This parameter changes with the temperature of the hydraulic fluid. ν was previously given in degrees Engler (°E), and then in stokes or centistokes (cSt), but is now given

if the input signal is changed from a static point in the same direction in which the static point was approached (DIN 24 311) ( Figure U 14 ). In measuring technology : Quantitative statement of the appearance