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Working principle of hydraulic cylinder

Mar 08, 2026

Hydraulic cylinders are the core actuators in hydraulic systems. Their working principle is based on Pascal's law, using fluid pressure to transfer energy and achieve linear reciprocating motion.

 

The working process of a hydraulic cylinder is essentially a conversion of pressure energy into mechanical energy. When the hydraulic pump inputs high-pressure oil into one chamber of the cylinder (such as the rodless chamber), the fluid pressure acts on the effective area of ​​the piston, generating thrust (F=P×A, where P is pressure and A is piston area). At the same time, the hydraulic oil in the other chamber (the rod chamber) flows back to the oil tank through a control valve, creating a pressure difference that drives the piston to move.

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