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Ratio between the direction of the controlled hydraulic fluid flow and the direction of the electrical input flow for continuously adjustable valves.

To remove particles of dirt that the pressure fluid is carrying with the aid of filtration of a wide range of types.

characteristics of a fluid or adds new characteristics (CETOP RP 100). The natural substance mineral oil is lacking a series of characteristics for its tasks as a hydraulic fluid; these characteristics

Hydraulic speed control during which the hydraulic fluid flowing out of the actuator is throttled, e.g. by a flow valve in the return pipe.

Fluid valve with binary behaviour, i.e. it moves from one switching position to another (e.g. Open – Closed) without adopting an intermediate position.

element. The column of fluid has resistive behaviour, if the internal damping is ignored (acoustic impedance only has a real element). The acoustic impedance of a column of fluid in a pipe is dependent [...] achieved if the acoustic impedance of the pipe termination is the same as the impedance of the pipe (fluid + pipe walls). The acoustic impedance is used in hydraulics in particular for the design of pulsation

Line which returns leaked fluid to the container. Its dimensions should ensure this is possible at all times with hardly any pressure — even at low temperatures.

Device for measuring pressure levels in fluid media. They may function directly (e.g. vertical column pressure gauge ) or indirectly, whereby elastic deflections, for example, are used to record the pressure [...] pressure level. The pressure gauges used in fluid technology almost always operate indirectly via measuring devices with a spring, whose deflections are relayed to a pointer. In terms of the structure,

Contamination of the hydraulic fluid in a hydraulic system prior to the first flushing. It comprises the contamination that is in the hydraulic fluid itself prior to filling the hydraulic system and the

The particle size of the contamination in a hydraulic fluid is spread over a wide area. In view of this fact, contamination classes have been created that set out the contamination in SAE-ASTM-AIA and [...] contamination classes also form the basis for the determination of the degree of purity of the hydraulic fluid after the filter .