Solenoid valves are electromagnetically controlled industrial devices, fundamental components of automation systems used to control fluids. They are actuators, not limited to hydraulic or pneumatic systems. Used in industrial control systems to adjust the direction, flow rate, speed, and other parameters of the medium. Solenoid valves can be used with different circuits to achieve the desired control, ensuring both precision and flexibility. There are many types of solenoid valves, each playing a different role in the control system. The most common are check valves, safety valves, directional control valves, and speed regulating valves.
Internally, a solenoid valve has a sealed cavity with through-holes at different locations connecting to different oil pipes. A piston is located in the center of the cavity, flanked by electromagnets on either side. Controlling the flow of current to the electromagnets moves the valve body, thus opening or closing the drain port. Valve body structures are classified into three main categories: direct-acting, distributed direct-acting, and pilot-operated, specifically including six sub-types such as direct-acting diaphragm structures and step-by-step direct-acting piston structures.
