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constant pump as well as a variable pump . The highest pressure occurring in the system in the pipes to the actuators p LS is fed back to the inlet pressure compensator or the LS controller for the pump and [...] whereas this element in the circuit with the variable pump is not even made available at this stage as a result of an adjustment to the flow rate for pump Q 1 . The individual pressure compensator may be located [...] total for the flow rates required is greater than the max. delivery flow for the pump. The LS system with variable pump is a closed centre system : if no flow rate is requested by the system (all proportional

Interaction between mechanical actuations and hydraulic amplification (e.g. pump adjustment , copying system ).

compensating for any oil leaking out. This is achieved, for example, using a pump with a pressure controller or a small pump or even a hydraulic accumulator , with the dimensions of both reflecting the

hydraulic drive element is controlled by changing the geometric displacement of a pump or motor . This includes the pump control (Figure V 10 a) and secondary adjustment of a hydraulic motor (b) in the

the other in the centre position for the oil flow are open, which means the full pump delivery flow from the constant pump passes through all the valves . Very high flow losses can occur with open centre

flow rate of the pump (= usable volume V N). To assess the flow requirements per working cycle, it is practical to create an accumulator consumption diagram ( Figure S 69 ). The pump must be selected with [...] before the end of the working cycle: The factor k (approx. 1.25) serves to relieve the burden on the pump during part of the working cycle.

Line connected to the intake port of a hydraulic pump or compressor and permits the transport of hydraulic fluid.

hydraulic systems normally need the pump to continue running even if its flow rate is not needed at that time, e.g. in the loading phase of a working cycle. The pump is then switched to circulation, i.e [...] control - which is not always without losses, as in addition to the internal idling losses in the pump, there are also flow and pressure losses, which the flow rate causes on its way through the idle [...] These circulation losses can be almost completely avoided by using a pressure/flow control for the pump.

As with this process, the system pump is completely exposed to contamination, it is recommended to use a flushing power pack with its own pump (normally a gear pump) for the flushing. In addition, separate

The drive contains only one pump that provides its flow rate to one or also more loads. Opposite: multi-circuit systems