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How does a racing 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. Lifting the racing jack handle draws oil from the two oil reservoirs.
Car and trolley jacks, axle stands, bottle jack, trolley jack, racing jack, vehicles, maintenance, mechanics, DIYers, wonkee donkee, hydraulic. A down stroke of the handle pushes pressurised oil to an inner fluid chamber of the hydraulic cylinder.
Car and trolley jacks, axle stands, bottle jack, trolley jack, racing jack, vehicles, maintenance, mechanics, DIYers, wonkee donkee, hydraulic. The two sequence valves located within the hydraulic system each open at different times to enable the hydraulic oil flowing from the inner fluid chamber to the oil reservoirs.
Car and trolley jacks, axle stands, bottle jack, trolley jack, racing jack, vehicles, maintenance, mechanics, DIYers, wonkee donkee, hydraulic. The first sequence valve is opened, while the second keeps pumping the hydraulic oil to the inner fluid chamber to raise the lifting arm.