If liquid is not compressible, why do we need special hydraulic fluid? Why not just use water?
In: Engineering
Hydraulic pumps and motors. There are sliding surfaces that require a thin layer of oil to keep parts form touching. Because if these parts touch, they become very fond of each other and start exchanging parts of themselves. And then things get really hot and angry.
Also oils higher viscosity greatly increases volumetric efficiency without the need for rubber seals, but rather tight tolerances to form a seal. Except in the case of cylinders where it needs to be a 100% seal to avoid unintended movement, hence rubber seals.
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