A solenoid valve is an electromechanically operated valve that controls the flow of fluids (gases or liquids) in a system. The valve operates by using an electromagnetic coil to move a plunger or a diaphragm, which opens or closes the valve. The introduction of durable plastic materials into solenoid valve construction represents a significant improvement in performance and lifespan over traditional materials, such as metal. These valves are typically made from high-quality plastics such as polyvinyl chloride (PVC), polyamide (PA), or polypropylene (PP), which provide resistance to corrosion, chemical reactions, and wear.