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To facilitate the interchangeability of valves from different manufacturers, port hole patterns are internationally standardised, i.e. the arrangement of the outlet bores on a valve that must match th

Process in a system/device during the transition phase to achieving a steady-state if the system/device has been excited by a step function . The settling process therefore shows how a transfer elemen

Controller on a digital basis (e.g. microprocessor) that samples the control error, calculates the correcting variable and sends it to the control element.

Change in the input signal that is necessary to generate a measurable change in the output signal, if the input signal is changed from a static point in the same direction in which the static point wa

Characteristic of a hydraulic fluid to separate from contamination by means of rising (air) or sinking (solids). Air separation capability: Characterises the ability of a hydraulic fluid to separate o

The volume V0 of a hydraulic medium is reduced by the volume VD when the pressure Δp is increased. The factor is the reciprocal of the Kompressionsmodul K. The value of K can be assumed to be 1400 MPa

Unlockable check valve with twin design. The shut-off unit is arranged to compensate for leaks from directional valves with a piston structure between the consumer (e.g. cylinder ) and the directional

Proportion of the time Tb for which a system or device (e.g. pump) is in operation during a specific period of time T s (e.g. a month or year). The duty ratio, besides what is required by way of relia

The total power lost by a hydraulic system is converted into heat, which is largely absorbed by the pressure fluid . It is comprised of the pressure losses caused by pipe friction and flow deflections

Control whereby the reference variable is provided by a program memory (programmer). Its task is to pick out a point in the respective program and issue corresponding function commands. In order for a