Basic Pneumatic Circuits - AutomationDirect

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The solenoid valve symbol SOL01 indicates it is a single-acting, spring-return valve. This valve is pilot-activated, indicated by the triangles at each side of the symbol. These pilot valves are efficient, using a small amount of air to move a large valve spool. However, a minimum amount of air pressure is required to move the spool. This minimum

  Pressure, Valves