常闭设计：常闭电磁阀的默认状态是关闭的。也就是说，在没有电力供给时，阀门保持关闭，阻止流体通过。

电磁控制：当电流通过电磁线圈时，它会产生磁场，推动阀芯移动，从而打开阀门，让流体通过。当电流切断时，弹簧或其他机制会将阀门关闭。 应用场景：这种类型的电磁阀常用于气动或液压系统、冷却和加热系统、灌溉系统以及自动化控制等多个领域。 常闭电磁阀的优点是：即使电源失败，阀门也会自动关闭，确保系统安全。然而，它的缺点是在没有电流时无法进行调节，因此适用于需要快速关闭流体的场景。 如果你有更多具体问题，欢迎告诉我！ 帮我写一篇关于Normally Closed Solenoid Valve的800字英文原创文章，并在文章前面配上一个标题,并在标题里面包含Normally Closed Solenoid Valve Understanding Normally Closed Solenoid Valves: Working Principle and Applications A Normally Closed Solenoid Valve (NCSV) is an essential component in fluid control systems, offering precise control over the flow of gases, liquids, and other fluids in industrial applications. These valves play a critical role in various sectors, including automation, fluid handling, HVAC systems, and more. In this article, we will delve into the functioning, types, advantages, and common applications of normally closed solenoid valves, providing a comprehensive understanding of this vital device.