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safe position in the case of a failure of the electrical control energy ( Figure V 26 , in this case with a open-centre position for A, B and T).

case of constant flow systems and secondary control of a hydraulic motor (c) in the case of systems with impressed pressure.

pressure" p 1,2 is allowed if differential pressure itself is the measured variable (in accordance with DIN 1314).

fluid to reduce mechanical wear on moving parts of a hydraulic system which it comes into contact with. To improve the wear protection capacity, wear protection agents are added (normally phosphate compounds)

development of the single-chip computer and, by implication, the microcontroller have made this possible, with the option to accommodate digital control electronics within the most confined of spaces.

In general : Flow rate to supply the hydraulic actuation of devices. With continuously adjustable valves : A distinction is made between the resting value of the control flow rate as its value in a stationary

pressure is acting. It is possible therefore to generate a very powerful force (e.g. at press pistons) with pressure generated by just a small area (e.g. pump pistons):

Graphically represented mutual dependency between two operating variables, with one or more variable parameters being used as parameters. This kind of performance map can provide a complete overview of

Leakage occurring inside a device. It is not visible from the outside, but can involve a loss of power. With pumps, for example, this may be a flow of leaking oil from the high-pressure side towards the suction

reflux of a feed cylinder). It consists of functional lines for individual movements in connection with drive and signal elements (Figure W 5). The position diagram is not bound to certain forms or measures