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directional valves with a spool this situation can result in undesirable incorrect switching. In addition, there is of course also the behaviour of technical fluids that behave in accordance with laws: The viscosity [...] . Every force acting on a stationary fluid generates a pressure that propagates in all directions with the same magnitude. This the basic law of hydrostatics . All force and pressure processes in fluids

closed loop position control system associated with machine tools, for example, and incorporates the loop gain . As such, it indicates the velocity with which a given position error is reduced to zero:

in which one output is connected to the input of the next element. In the case of series circuits with resistors in the same way as the electrical engineering, the individual resistances are added together [...] to the overall resistance ( Figure R 25 ). Therefore, for example, the required pressure increases with the length of the line and the number of valves passed through. In the case of series sub-circuits

hydraulic energy from the location of generation (pump) to the location of conversion ( cylinder , motor) with the minimum possible losses. They are also used to reduce the wear of parts that slide against each [...] it flows through the system, the hydraulic fluid conducts away the locally occurring heat and takes with it contamination, which is caused by debris, for example. For this task, mineral oils and flame-resistant

in between the two Figure V 33 ). If the prescribed temperature cannot be reached with normal mineral oil, an oil with a viscosity improver must be provided ( HV oils ) or it must be pre-heated or cooled

measured value — and therefore each measurement result — is influenced by any imperfections associated with measuring instruments and measuring devices , the measuring procedure and the measured object; there [...] there are also influences from the environment and the observer whereby time differences associated with these influences play a part too ( Figure M 16 ). A distinction is made between random and systematic

(Figure E 24 b) . With DC solenoids it is possible to shorten the switching time by means of fast excitation or over-excitation . Actuation of a fluid-based device by a solenoid with a stroke that is

orifice , throttle ) are used to control the movement of hydraulic motors and cylinders ( control with throttle ), this is based on the principle of connecting pressure dividers (similar to electrical [...] the output. These circuit arrangements are referred to as hydraulic half bridges by way of analogy with the electrical half bridge. In order to control each displacement chamber of an actuator , a single

Fire-resistant fluids based on water with 2 to 5% concentrate intended to give the water a minimum level of protection against corrosion and wear. Depending on the composition of the concentrate, emulsions [...] emulsions of every kind (HFAE) are produced, including micro-emulsion with mineral or synthetic oil, or a solution (HFAS). Concentrates for solutions are completely oil-free and more environmentally friendly

defined in the Druckbehälterverordnung (German regulations on pressure vessels) dated 27 Feb. 1980 with an amendment dated 21 April 1989 as well as UVV 17 from the Berufsgenossenschaft (responsible authority [...] p · l <200) and which in group III (200 < p · l ≦1 000) is undertaken at the manufacturer. Vessels with a pressure-litre product above 1 000 must be inspected by TÜV at the operating organisation every