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Variable issued by the controller output. To differentiate it from the correcting variable, it is given a subscript R (DIN 19 225). The controller output variable is only the correcting variable which

Valve that is in parallel with a hydraulic unit and that permits the pressure fluid to bypass this unit under certain circumstances. Example: Pre-loaded check valve that is in the secondary flow for a

Also called the delay time. It is the time, which the output signal of a 1st order delay element requires to reach 63% of the end value. After 3 · T 95 % and at 5 · T almost 100 % of the end value (Fi

Devices and functions involved in with the task of performing the spatial coordination and synchronisation of the individual sub-functions in a process. The sequence of all sub-functions is to be stor

Filtering of the oil sucked up by the hydraulic pump . Theoretically ideal, as then the pump is also used optimally. In reality, however, as the dirt absorbing capacity drops, there is a risk of cavit

Fluid where the shear stress is proportional to the velocity gradient dv/ds: The proportionality factor η is referred to as the dynamic viscosity . Mineral oil is a Newtonian fluid, whereas lubricatin

Also referred to as multi-loop controllers, these are controllers where, in addition to the actual controlled variable such as the position, one or more other variables such as the velocity and/or acc

The part of a filter that undertakes the actual filtering action. Filter elements are generally designed so they can be replaced easily and are disposed of after use (exception: metal filters). The ti

Follow up control in which the reference variable is specified according to a time schedule (also called the schedule controller) (DIN 19 226 Part 5).

Individual pressure compensator