Working principle of hydraulic jack
2025/11/11
The core principle of hydraulic jacks is Pascal's law: pressure changes at any point in a sealed liquid will be transmitted to all positions without attenuation. Its structure includes a small piston (active piston) and a large piston (passive piston):
Lifting process: When manually operating the small piston, the applied force generates high pressure on a small area, and the liquid transfers the pressure to the large piston. Due to the large piston area being much larger than the small piston, the output force is significantly amplified (formula: output force=input force x large piston area/small piston area), thereby achieving lifting heavy objects with small force.
Descent process: Open the return valve, and the oil in the working cylinder flows back to the storage chamber. The large piston descends under the weight of heavy objects.
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