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How a Yipeng Spiral Jack works

From a users perspective, when working with a hydraulic Yipeng Spiral Jack, you need to insert the metal pumping bar into the handle socket and pump it, which will push the ram up and raises the boom with a load attached to the end. To lower a load you need to open the bleed valve located on the base of the jack. But what happens inside of the cylinder when working a jack?
Well, basically the same Pascal’s principle is being used to lift a load. When you activate the pumping system by inserting the pumping bar into the handle socket and pumping it, the hydraulic fluid (oil) is pushed to the cylinder though a one-way valve, applying pressure to the fluid while filling the cylinder. The fluid can only flow back from the cylinder through another valve which is blocked by a steel ball, to open it you must unscrew the bleed valve located at the bottom of the ram.

Because the one-way valve does not allow the fluid to go back, the pressure in the cylinder builds, while the jack is being pumped. The pressure inside the cylinder puts out force and lifts the piston and the ram upwards, allowing to lift heavy loads by continuously applying small force in the small cylinder, which is multiplied in the larger cylinder. Basically, the larger the cylinder is, the more weight you could lift, which allows to lift very heavy loads simply using a hand pump mechanism.

Hydraulic cylinders are used in mechanical devices all around us, from car brakes to many hydraulic equipments that not only lifts, but also pushes, drills, cuts, crushes and does all kinds of other movements. The working principle of all these devices that use a hydraulic cylinder is very similar, what differs them is their specific usage and amount of force they output, which determines how strong the structure of the device must be to withstand the high pressures inside the cylinder.

Spiral Jack - http://www.yipengjack.com/