Stiefel (Guangdong) Energy Environmental Protection Engineering Co., Ltd.'s normally closed solenoid valves are designed to block fluid flow by default until activated by an electrical signal. This feature provides enhanced safety and control in various applications, as it prevents unwanted fluid passage when the valve is not energized. These valves are constructed with high - precision components and durable materials, ensuring tight sealing and reliable shut - off capabilities. When powered, the solenoid coil generates a magnetic field that lifts the plunger, allowing fluid to flow freely. The normally closed solenoid valves are engineered to withstand high pressures and harsh environments, offering long - lasting performance. Their simple yet effective design makes them easy to install and integrate into existing systems, providing customers with a reliable and efficient solution for fluid control where a default closed state is required.