Separator
Device for separating small particles of dirt from the hydraulic fluid based on other particle characteristics apart from the particle size.
Usable volume
The proportion of hydraulic fluid within the total volume of a hydraulic accumulator that can be removed without causing any damage.
Viscosity range
Range within which the viscosity of a hydraulic fluid satisfies the requirements placed on it. It is defined by operating conditions.
Valve polarity
Ratio between the direction of the controlled hydraulic fluid flow and the direction of the electrical input flow for continuously adjustable valves.
Filtration
To remove particles of dirt that the pressure fluid is carrying with the aid of filtration of a wide range of types.
Inhibitor
Additive which delays certain reactions in hydraulic fluids . It is used most commonly to counter processes associated with ageing and corrosion.
Additive (for lubricants)
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
Meter out control
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.
Directional valve
Fluid valve with binary behaviour, i.e. it moves from one switching position to another (e.g. Open – Closed) without adopting an intermediate position.
Acoustic impedance
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