The hydraulic pump converts the mechanical energy of the prime mover into hydraulic energy for use by the system. Hydraulic energy is the combination of pressure and flow required by an actuator to perform useful work. It is important to understand that hydraulic energy is both pressure and flow, as one cannot do the job without the other. The pressure consists of a trapped fluid, and the flow will have no energy to move the fluid alone.
The hydraulic pump pushes the fluid, and for that matter, the fluid can be considered solid as it travels throughout the machine and then pushes the actuator to move the load. Motion controllers will ask me to point out that oil is compressible, but that's a discussion on another blog.
The point is that the pump may be pushed on sand, ball bearings, or other solid media capable of forming the shape of its container, and the result is still the transfer of force.
The transfer of force is indeed synonymous with hydraulics and the basis of Cosford's law, which states that "pressure makes it disappear, and flow is the rate at which pressure can be generated." "For the movement of the fluid, the pressure reaches the position of the pump; Always. It is wrong to face the fallacy that stress is directed to flow. The pressure will rise to the pressure needed to overcome downstream resistance, but if the pressure is not activated at the pump, the fluid will move backwards.
The pressure in hydraulics is a consequence of Newton's third law of motion, which makes each action have equal and opposite reaction forces. The reverse force can be a loaded cylinder or a flow controller, and the pump doesn't care.
It will continue to push the fluid as the pressure rises to overcome the resistance, even if this causes overload of the prime mover.
