Higher pressures mean higher force and torque is available from smaller components. And because these components are smaller in displacement, higher speeds are possible from smaller flows. Smaller flows mean pipework, valving and even the tank can be made smaller - remember, the old rule of thumb for tank size (largely ignored these days) is 3 to 5 times pump flow/min.
So the power density of individual components and the system as a whole increases with pressure. But there are a number of disadvantages with higher operating pressures:
Oil viscosity and film strength are vital to maintain full-film lubrication between heavily loaded contacts. I already consider the oil to be THE most important component of any hydraulic system. But this will definitely be the case for machines operating at higher pressures. Oil selection AND maintenance will be critical for optimum reliability.
Similarly, contamination control will be more important than ever. Because the more heavily loaded the lubricated contacts - the more susceptible they are to wear and damage from water and particle contamination.
For machine designers, issues such as tank size, installed cooling capacity, filtration, contamination control, and oil recommendations will be even more important than they are now. And the impact of mistakes or omissions at the design stage on equipment reliability will be even more significant.
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