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proportional to the difference. To this end, the control unit for the valve is connected to the unit specifying the setpoint (e.g. a stepper motor ), while the valve housing is connected to the hydraulic [...] the positions of both valve elements will change with respect to each other until the difference to the actual value is zero again ( Figure N 1 ).

1. Pressure intentionally generated by a resistance in a system (e.g. in the outlet line of a system). 2. Pressure to which the oil in a tank is subjected if the suction of the pump requires this. To that [...] that end, a rubber diaphragm absorbs the gas at 0.3 to 0.6 bar ( pre-charged oil tank).

depending on the pressure ( Figure R 1 ). The radial gap compensation makes a significant contribution to allowing such internal gear pumps to work at pressures of 300 to 350 bar. [...] To reduce the leakage losses, the ring gear of an internal gear pump is pressed against the internal gear and a sickle-shaped body is placed between the ring gear and internal gear, minimising the play

corrosion-protection properties for systems subjected to a high thermal load. Viscosity index 95 to 105. (requirement standard DIN 51 524, Part 1).

To measure the differential pressure Δp the two pressures p 1 and p 2 must be separated from each other by diaphragms that are connected by a plunger. The deflection of the two diaphragms then corresponds [...] corresponds to the pressure difference . As this pressure difference can be between very small, in relation to the system pressure, and very large and single-sided, differential pressure gauges are mostly of

tiered such that 2n—1 delivery flow steps are obtained. By enabling and disabling (unpressurised idle circulation) individual pumps the overall pump delivery flow can be adjusted to demand. Digital pumps [...] only used infrequently these days. Instead the easier to use but also more expensive variable pump is used with a delivery flow that must be equal to ΣQ n.

and to some extent conditioning hydraulic fluid (removal of contamination and air, quietening). Is used at the same time to remove dissipated heat , however it is only suitable for this task to a limited [...] (Table B 1) . As the tank is manufactured of thin material, it must not be in physical contact with the pump to prevent noise propagation. Tanks mostly have a breather filter that connects them to the exterior [...] tank (Figure B 5) ). In special cases closed tanks are used that are pressurised to 0.3 to 0.6 bar using compressed air to improve the filling of the pump. In this case, a rubber diaphragm is recommended

The term has two elements: 1. Sum of all measures that are necessary to ensure the safety of the operator as well as the machine against overload. Here the requirements from the responsible authorities [...] s have priority; these primarily relate to the safety of controls. 2. Operating safety in the context of trouble-free operation, i.e. far-reaching exclusion of any causes of failure. The measures necessary [...] necessary for this aspect extend down to design details in the individual devices (reliability, availability).

increases (Vd) proportionally to the temperature difference with the expansion coefficient βT. For hydraulic oil, the expansion coefficient can be assumed to be 0.7*10-3 1/K. Calculate the volume increase

comparison elements, which can be adjusted externally and issues a standard output signal from 0 to 20 mA (or 0.2 to 1 bar standard pneumatic signal) ( Figure T 16 ).