I'm going to assume you mean fluid (oil or liquid) powered
machinery rather than fluid power generating systems such as water
dams.
There are many benefits to a hydraulic system
compared to other power systems.
In a pneumatic (air)
powered system there are only two states, pressurized or depressurized. With hydraulics
you can control the flow of the fluid and therefore control position and force quite
easily.
With electrically powered system such as a motor
powering a drivetrain, the motor must be at high revolutions per minute in order to
provide sustainable torque. Hydraulic systems can generate high amounts of torque at low
rpm. Depending on the sytem design they can also take up less
space.
One hydraulic pump can also power a large variety of
systems within a shop or machine via manifolds and valves. Electric systems often
require one motor and gear box for every sytem. This helps to reduce cost and
maintenance issues.
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