A solenoid valve is an electromechanical device used to control the flow of liquids or gases in automated systems. It operates by converting electrical energy into mechanical motion, which opens or closes the valve. Solenoid valves are widely used in industrial automation, HVAC systems, water treatment, and pneumatic machinery due to their fast response, reliability, and compact design. Common types include direct-acting, pilot-operated, and latching solenoid valves, each suited for specific pressure ranges and flow rates. Key features often include corrosion-resistant materials, high-temperature tolerance, and low power consumption. Typical products in this category include 2-way, 3-way, and 4-way solenoid valves in various sizes (e.g., 1/4" to 2") and voltage options (12V DC, 24V DC, 110V AC).