In short, hydraulic systems are used in real life because they have many advantages as a device that transmits power by utilizing pressure from fluids.
<Advantages>
Response speed is fast.
Unauthorized shift is possible by adjusting the flow rate.
The small device can produce a large output.
Easy to control and easy to operate.
Automatic control and remote control are possible.
Automatic rust and lubrication.
Control of pressure, flow rate and direction by various control valves is simple.
Safety against overload is simple and accurate.
It is possible to accumulate energy.
<disadvantages>
▶ When affected by temperature, the viscosity of the oil may change and the output may change.
▶ Risk of leakage at high pressure.
▶ Risk of fire.
▶ Composition work is more difficult compared to electric circuits
▶ There is a possibility of failure due to dust or foreign substances.
▶ Operation speed is lower than air pressure.