This magnetic field attracts the plunger and it moves in the upward direction. When the current passes through the coil, it will generate an electromagnetic field. When there is no charge in the coil, it would be in a de-energized state and the valve is in a normal position. This is the basic principle of Solenoid Valve.Ī solenoid valve mainly consists of two parts: a solenoid and a valve body.Ī solenoid has an electrical coil around an iron core at the center called a plunger. This process controls the flow of liquid or gas. In the idle position, the plunger closes the orifice. This magnetic field attracts a plunger upwards and opens the orifice. When an electric current passes through the electric coil then it creates a magnetic field.

Indirect Acting (Servo or Pilot Operated) Solenoid ValveĪ solenoid valve is an electro-mechanical device that is commonly used to control the flow of liquid or gas.Ī valve has a solenoid, which is an electrical coil with a movable ferromagnetic core, referred to as a plunger, in its center.Symbol for 3 port valve with 2 positions. Symbol for 2 port valve with two positions, one position valve open with flow in both directions or valve closed with both ports blocked. The spring pushes from the side that is drawn on and will return the valve back to its failsafe position. Symbol for spring or rest position of valve. Symbol for two port valve with both ports closed. Three square or rectangular blocks specify the valve has three possible positionsĪrrows specify the direction of flow, in this case in one direction, if a line has an arrow at each end then the flow is bi-directional or flow in both directions. Two square or rectangular blocks specify the valve has two possible positions Square or rectangular block specify a valve position. Understanding schematic symbols will help to better understand at a glance the application, control, direction, amount of flow for actuated valves, cylinders and rotary actuators. Understanding ANSI / ISO Schematic Symbols for fluid power and pneumatic components are used to identify and graphically denote the function and operation of piped control systems. Solenoid Valve and Common Pneumatic System Symbols.

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