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content of a fluid). With fluids, it is almost possible to assume that a constant bulk modulus and isothermal compression apply. The result is as follows: where V K = Compression volume With gases, the compression

A nozzle is a local flow resistance with a gradual cross-section constriction (e.g. rounded inlet edge) on which the smallest flow cross-section - unlike on the orifice - is within the geometric cross-section [...] friction are generally no longer negligible. The flow rate through the nozzle is, as on orifices, defined with the aid of Bernoulli's equation. The loses due to fluid friction and the surge losses are taken into

pressure drop assumed at the control edges as well as the magnitude of the opening cross-section and with it the swing on the input signal (Figure D 82) . On pressure valves : Characterises on directly controlled [...] controlled valves the effect of the stiffness of the adjusting spring on the pressure rise with increasing flow rate: the harder the spring, the higher the pressure climbs at Q max. Here pilot-controlled

) and is pressure-controlled. With servo valves , the quiescent flow comprises the flow for the first stage and the leakage for the second stage. It changes in line with the inlet pressure and the input

to cover the surface over which it is distributed to a greater or lesser degree. Hydraulic fluids with good wetting ability adhere better to the surface. As a consequence the lubricating film has better [...] better load bearing in the boundary layer area. This aspect is particularly important for seals where with poor wetting ability the lubricating film is pressed away at the sealing surfaces such that dry friction

generally a transfer element with an input variable and an output variable is referred to as unstable (not stable from a transmission perspective) if the output variable associated with each restricted input

for the measured variable. Compared with the correct value for the measured variable — the input variable for the measuring device — the measured value is associated with errors caused, for example, by an

fill the cylinder chamber behind a piston moving rapidly under its own weight or with a piston for rapid traverse with unpressurised oil from the tank. The high velocity required produces very high flow

Double-acting cylinder with one-sided piston rod in which the ratio of the piston area AK to the annular area on the piston rod side is essential for the function of the fluid-related circuit (CETOP RP100) [...] as large as possible. The different size areas signify different velocities in the flow and return with the same Q: The ratio of the two areas is termed the ratio of piston areas α.

within the signal processing with digital signals and that primarily processes numerically represented signals (Figure D 28) . The signal processing is undertaken primarily with digital function units, such