How does a bottle jack work?

How does a bottle jack work?

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Car and trolley jacks, axle stands, bottle jack, trolley jack, racing jack, vehicles, maintenance, mechanics, DIYers, wonkee donkee, hydraulic. An upstroke of the jack handle draws oil into the pump cylinder.
Car and trolley jacks, axle stands, bottle jack, trolley jack, racing jack, vehicles, maintenance, mechanics, DIYers, wonkee donkee, hydraulic. A downstroke of the jack handle pushes pressurised oil to the main cylinder causing it to raise the main piston.
Car and trolley jacks, axle stands, bottle jack, trolley jack, racing jack, vehicles, maintenance, mechanics, DIYers, wonkee donkee, hydraulic. After constant pumping of the jack the check valves will open and close with each motion.
Car and trolley jacks, axle stands, bottle jack, trolley jack, racing jack, vehicles, maintenance, mechanics, DIYers, wonkee donkee, hydraulic. The main piston keeps raising as the jack is pumped.