Directional control valves are used in pneumatic systems to direct or stop the flow of compressed air or oil to their appliances. They are probably the most used elements in pneumatic systems and can be used for example to actuate a cylinder, a larger industrial valve, or air tools. The valves can have two or more ports and fulfil various circuit functions. The function and behaviour of the valve can be indicated by a symbol. The symbol however doesn't explain the construction of the valve. Directional control valves can be actuated by different means, such as manual actuation or solenoid actuation. This article focuses on the different directional solenoid valves for pneumatic systems.
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