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What is solenoid valve ? Explain its working with the help of diagram.
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Solenoid valve is an electromagnetic valve used to control flow of fluid such as air or oil. It consists of a solenoid assembly and valve assembly. When current passes through solenoid, the plunger is lifted upwards and the valve is opened. In normal state, because of return spring force, the valve remains closed. Solenoid valves are used in hydraulic and pneumatic circuits to regulate air/oil flow. 
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