Variable delivery flow (control)
piston and vane design that changes the delivery flow in accordance with an input variable. On the pump this is a distance s that can be specified in various ways (Figure F 29) . This process takes place
Flow rate measurement procedure
the displacement principle with flow sensors with oval rotor assembly , measuring turbines or gear pump flow meters , which can take direct measurements ( Figure V 35 ). In addition, the dynamic pressure
Adjustment of displacement machines
equipment or the pivoting angle of the pump is feedback controlled, there is an internal with the position-controlled setting piston, whereas the output variable of the pump or motor is still subject to interference [...] controls" Equally "controlling" should not be equated to "adjusting", as this is a measure of the pump, which is necessary for controls and feedback controls. This is taken from an order in accordance [...] feedback controls in hydraulic systems this would raise false expectations in the case of a "controlled" pump. Controlled adjustment : Here a distinction must be made between adjustments with and without an internal
Power limiting
limiting may be subordinate to some form of pressure reduction ( pressure controller for a variable pump), something referred to as pressure limitation . As the pressure p 11 increases, the displacement [...] will be kept constant the same way by V 1 adjusting itself to the changing pressure. If more than one pump is being used at a combustion engine, pure power limiting is often dispensed with in favour of limit
Constant flow system
open circuit are therefore always fitted with constant pumps (in a closed circuit, with a variable pump ) and can only operate one load at a time ( Figure K 30 ). If there is more than one load in a system
Action of multiple resistance
are added ( series circuit ). This means, for example for the "pressure-free" circulation of the pump through a directional valve and a filter including pipes, that a Δp of 8 to 10 bar is easily created
Positive displacement principle
actuator (cylinder, motor) must overcome. This involves forming mechanically sealed chambers in the pump to transport the medium from the inlet (suction port) to the outlet (pressure connection). As there
Energy conversion
electrical systems signifies rectification or frequency conversion, while on fluid-based systems a pump or a compressor is required. The drive element in electrical systems is the electric motor, and in
Rotary flow divider
Device which divides the delivery flow of a hydraulic pump into two or more equal or unequal sub-flows. It consists of a suitable number of displacement units based on gears or pistons, whose shafts are
Swash plate machine
Axial piston machine ( Axial piston pump or Hydraulic motor ) with a rotating cylinder block in which the piston strokes are caused by a fixed swash plate with a largely adjustable drive angle (max. approx