Static behaviour
regarded as a special case of the transfer behaviour , in which the input variables remain constant. It can be described by characteristic equations or curves.
Slipper
raceway). To reduce the contact force and therefore the friction the slipper is designed such that it can act like a hydraulic bearing ( hydrostatic relief ). The hydrostatic pressure necessary for this purpose
Incremental digital measuring system
measuring system in which first a reference point must be moved to such that a specific position can be determined by counting increments forward or backward (Figure D 29) . The position obtained in this
Power losses
between the power supplied and the power delivered ( hydraulic efficiency ). Much of what is lost can be attributed to: volumetric losses : these are caused by incomplete filling of the pump, internal
Piston for rapid traverse
the rapid forward movement is at an end. For this purpose it must be ensured that the main piston can draw in unpressurised oil during forward movement (Figure E 2) .
Oil hydraulics
seals , including those with short seal lengths, which means the components used in oil hydraulics can be designed to be relatively compact.
Differential pressure measurement
deflection of the two diaphragms then corresponds to the pressure difference . As this pressure difference can be between very small, in relation to the system pressure, and very large and single-sided, differential
Class of accuracy
on which the error and also the effects in defined test conditions are within defined limits; they can have a class identifier that mostly corresponds to a the value in % of the actual value or of the end
Axial gap compensation on gear pumps (so-called gap compensation)
of the gear wheels, i.e. in the axial direction. The pressure-controlled leakage that occurs here can be reduced if the clearance gap at the side is reduced with increasing pressure. The axial compensation
Control pressure
Pressure required to start or maintain the function of a valve (device). The control pressure can be, but does not necessarily have to be, identical to the pressure in the system. A differentiation is