The hydraulic air bottle jacks, also called as hand jacks, provide an easy way to lift up a vehicle for service. Available in different sizes and weights, they have lifting capacity of several tons.
A hydraulic bottle jack is robust and safe to use device with a sturdy steel construction and a safety overload valve. An easy height-adjustment screw and a large sturdy base add more points to its reliability. A vertical shaft featured in bottle jack supports a platform known as a bearing pad that directly holds the weight of the object to be lifted.

The bottle jacks are made of two major elements, steel and heat-treated steel. Steel is an alloy which is produced by mixing carbon with iron to give steel its strength. Whereas, heat treatment is applied to alter the physical properties of the material. It simply involves heating or chilling to extreme temperature that results in softening or hardening of material.

When the jacks are heat treated, they harden the steel and give strength to bottle jacks so that they can withstand heavy loads for continuous use.

Working Principle of a Hydraulic Jack
The physics applied behind a hydraulic bottle jack follows Pascal’s principle. It simply signifies that the liquid inside a container is incompressible that results in similar pressure within a container at each point. The basic working of hydraulic jacks depends on the force generated by pressure.
While lifting heavy loads, the jacks use pump plungers to move oil via two cylinders. The plunger is drawn back initially and opens the suction valve ball that draws the oil into the pump chamber. When the plunger is pushed forward, the oil is moved into the cylinder chamber through the external discharge check valve. This results in closing of suction valve and pressure building within the cylinder.

Below steps can summarize how a hydraulic bottle jack works-
1. Upstroke of jack handle allows drawing of oil into pump cylinder.
2. Downstroke of handle push pressurized oil to reach to the main cylinder that causes raising of main piston.
3. Continuous pumping of jack enables opening and closing of check valves with each motion.
4. As the jack is pumped, it allows main piston to remain raised.

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