For an in-depth understanding of symbols and understanding circuit function diagrams, view our valve symbol page. An overview of 2-way and 3-way solenoid valves is below. The specific purpose of a solenoid valve is expressed by its circuit function. Solenoid valves are used to close, open, dose, distribute or mix the flow of gas or liquid in a pipe. The three most important ones are explained in this article: direct acting, indirect acting, and semi-direct acting operation. These solenoid valves use different operating principles that are optimal for the application. Solenoid valves are used in a wide range of applications, with high or low pressures and small or large flow rates. The shading ring (C) prevents vibration and humming in AC coils. If the valve is normally open, the plunger moves downward so that the seal (F) blocks the orifice and stops the flow of the media through the valve.
If the valve is normally closed, the plunger is lifted so that the seal (F) opens the orifice and allows the flow of the media through the valve. This creates a magnetic attraction with the plunger, moving it and overcoming the spring (D) force. When current flows through the solenoid, the coil is energized and creates a magnetic field. In the de-energized state, a normally open valve is open and a normally closed valve is closed. At rest, it can be normally open (NO) or normally closed (NC). A solenoid has an electromagnetically inductive coil (A) around an iron core at the center called the plunger (E). There is an arrow sign on the valve showing flow direction, please follow the sign to connect pipes.Figure 2: Components of a solenoid valve coil (A) armature (B) shading ring (C) spring (D) plunger (E) seal (F) valve body (G)Ī solenoid valve consists of two main components: a solenoid and a valve body (G). Also, liquid can only flow in one direction. The valve has a gasket arrangement inside, so there is a minimum pressure requirement of 0.02 MPA (3 PSI). When 12VDC is applied to the two terminals, the valve opens and water can push through.
These water solenoid valves would make a great addition to your automatic gardening watering system. Control the flow of fluid using an Arduino board or any other microcontroller/ computer.
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