The working principle of hydraulic transmission takes hydraulic jack as an example - hydraulic pump

2025-07-16

he working principle of hydraulic transmission takes hydraulic jacks as an example, which complete the lifting of heavy objects in three steps.

1. Oil absorption process: Lift the lever handle upwards to drive the piston to move upwards. The piston and pump body are well sealed, and the oil body moves upward from the oil tank through the one-way valve into the oil pump, completing the oil suction process.

2. Oil pressure and lifting of heavy objects: Press down on the lever handle, as the one-way valve is currently closed, the oil will not flow back to the tank. Due to the liquid pressure, the one-way valve opens and the oil enters the hydraulic cylinder through the oil pipe, lifting the heavy object. At this time, the oil drain valve is in the closed state.

3. Falling back of heavy objects: Due to the pressure of the heavy object itself, the piston tends to move downward. If the oil valve is opened at this time, the oil body will move downwards. At this time, because the one-way valve is closed, the oil will not flow downwards due to the pressure of the heavy object itself.

Welcome to call Kunshan Chuanna Hydraulic Parts Co., Ltd. for the purchase of hydraulic pumps.