From the Reservoir the fluid goes to the Pump where there are three connections. 1. Accumulator(top) 2. Relief Valve(bottom) & 3. Control Valve. The Control Valve goes to the Cylinder which returns to a filter and then back to the Reservoir.

Hydraulics are sometimes looked at as an alternative to electric motors.

Some of the primary reasons for this include:

Linear motion Very high torque applications Small package for a given torque Large number of motors that can share the reservoir/pump can increase volume efficiency You can add dampening for shock absorption

However there are also some downsides to using hydraulics including:

More parts are required (however they can be separated from the robot in some applications) Less precise control (unless you use a proportional valve) Hydraulic fluid (mess, leaks, mess, and more mess)

Hydraulic systems use an incompressible liquid (as opposed to pneumatics that use a compressible gas) to transfer force from one place to another. Since the hydraulic system will be a closed system (ignore relief valves for now) when you apply a force to one end of the system that force is transferred to another part of that system. By manipulating the volume

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