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Every machine or even every cylinder , provided its movements overlap with others, has a dedicated pump with a size based on the highest load speed v k required (Figure E 13) . This means that high speeds [...] larger range. In (Figure E 14) the cross-hatched area marks the flow rate gain compared to a constant pump of the same (corner) power.

in inlet (primary circuit, a ): Fine-tuned control of the pump flow rate ; pressure in the cylinder = operation pressure , pressure on the pump = nominal pressure of the system and therefore results in [...] flow into the cylinder. Fluctuations in the flow rate of the pump are passed on to the cylinder. Not suitable for accumulator operations. The pump only operates against the load pressure, resulting in as low [...] sides of the cylinder are exposed to pressure; the lower volume on the rod side is controlled; the pump always operates against the nominal pressure, resulting in a high power loss. 2-way flow control valve

base. The pressure head is useful, e.g., if it is necessary to improve the intake characteristic of a pump by making the oil flow to it.

generate a very powerful force (e.g. at press pistons) with pressure generated by just a small area (e.g. pump pistons):

Reverse of the Vane pump principle , in which two vanes are adjustably arranged in the housing at an angle of 180°, which, together with two cams on the rotor, create two suction chambers and two pressure

compounds). The wear protection capacity is determined by the Vickers test, in which the debris on a vane pump is measured under defined conditions.

rotation speed is reversed by reversing the absorbed volume flow using a directional valve or reversing pump .

Table U 3 ). It is expressed in the form of flow rate pulsations (flow rate pulsations caused by the pump kinematics). The relative delivery fluctuation is calculated as the difference between the maximum [...] flow rate, in relation to the average flow rate: Its size depends on the construction design of the pump and the number of displacement elements. In addition, in the case of piston pumps with an even number

of a pump is smaller than the theoretical drive rotation speed Q 1th by the leakage losses Q 1L (product of drive speed and displacement volume ): The effective drive torque M 1eff on the pump shaft is

or separate drive for machines ) Each output element has a dedicated drive element or a dedicated pump. Separate circuit hydraulics are used on simple drives and in systems with several drive elements