Solenoid valves are essential components in modern fluid control systems, functioning as electromechanical devices that regulate the flow of liquids and gases. The core principle behind their operation involves an electric current passing through a coil to generate a magnetic field that either opens or closes the valve. Depending on the materials used to construct these valves, they are categorized into different types, each offering distinct advantages for specific applications. In this article, we will explore two common types of solenoid valves： stainless steel and plastic solenoid valves, and discuss the factors to consider when choosing between them.