Скачать или смотреть Understanding of Hydraulic Cylinder and symbol

What is called hydraulic?
Hydraulic power, also called Fluid Power, power transmitted by the controlled circulation of pressurized fluid, usually a water-soluble oil or water–glycol mixture, to a motor that converts it into a mechanical output capable of doing work on a load.

A hydraulic cylinder (also called a linear hydraulic motor) is a mechanical actuator that is used to give a unidirectional force through a unidirectional
stroke.
It has many applications, notably in construction equipment (engineering vehicles), manufacturing machinery, and civil engineering.

Stroke:: The stroke is the amount of travel the piston rod can move in and out. It can be found by subtracting the maximum extended length of the hydraulic cylinder from it's minimum compressed length

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