The most basic description of a valve is a mechanical device that opens and closes, most often to control the flow of fluid-liquid or air. Valves exist in nearly every industry, from automobile engines to the foundries that cast the engine's valves; yes, there are valves on the machines that make valves.
Hydraulic valves are manufactured in a variety of styles to function in different applications. Valves are used to manipulate the flow of hydraulic fluid within a hydraulic circuit and are activated either mechanically or electronically. Directional Control Valves are the most commonly used valve in a hydraulic system . Control valves direct the flow of hydraulic fluid from the pump to the actuators or other sections of the hydraulic circuit. Control valves are returned to their neutral state with a spring or held in each position with a detent mechanism. These valves are generally used to control the direction of a hydraulic motor or cylinder; they can also perform other functions in a circuit.
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