.. .about valves but were too afraid to ask. Take heart with our pulsating guide to controlling the pressure and flow of the lifeblood of every materials handling machine While today's hydraulic systems are highly sophisticated, they are based on relatively simple devices operating on a few easily understood principles. In its simplest form, a hydraulic system consists of a pump driven by an external power source that uses pistons, vanes or gears to pressurise a fluid and move it through the system in paths determined by valves to power cylinders, motors, and other devices that transform the flow of pressurised fluid into motion to do useful work.
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