Switching methods for hydraulic pumps
supplies its own circuit. Parallel circuit : Several pumps work together for a single consumer. This may be caused by a fixed circuit connection or temporary interconnection. A special type of parallel circuit
Pipe capacity
with oil. If the enclosed oil volume under pressure is represented by the letter V, the pipe capacity may be calculated as follows. The dynamic performance of hydraulic drives is largely dependent on the pipe
Integrated position measuring systems
lengths of 500 or 1000 mm, ultrasonic sensors can be manufactured for lengths of several metres. They may also feature a digital output.
Wheel motor
hydraulic motors with connected reducing gears are used or designs, in which the hydraulic motor – which may also be adjustable – is integrated into the gear such that the torque is transferred over a ring gear
Hydromechanical efficiency
Losses in hydrostatic input/output elements mainly caused by friction forces — which may depend on rotation speed, pressure or velocity — and by flow losses . The resulting loss torques are M c = constant
Signal flow diagram
signal is shown by a line of action with an arrow at the top (DIN 19 226). The functional relationship may be illustrated by descriptive equations (Pos. a ( Figure S 59 )), or in a graphical, normally qualitative
Null bias
zero point remains stored in the control regardless of the shift. The point determined in this way may be the zero point for the workpiece (DIN 66 257). With continuously adjustable valves : Shifting of
High Water Based Fluids (HWBF)
y friendly in general. High Water Based Fluids (HWBF) fluids have the same viscosity as water and may only be used between +5°C and +55°C. They have no standardised characteristics, since locally available
Measuring range
within specified error limits on the basis of values for the output signal . Measuring instruments may have several measuring ranges with different error limits. A device for changing the measuring range
Hydraulic accumulator
which the accumulator pressure may decrease following withdrawal of the usable volume. Maximum operating pressure : The upper value to which the accumulator pressure may increase following admission of