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: Function and Applications

A solenoid valve is an essential component used in numerous automation and fluid control systems. Among the various types of solenoid valves, the Normally Closed (NC) Solenoid Valve plays a critical role in ensuring that fluid or gas flow is restricted until required. As its name suggests, this valve remains closed under normal conditions (when no electrical power is applied to the solenoid), making it an ideal choice for many applications where controlling the flow of liquids or gases is vital. What is a Normally Closed Solenoid Valve? A Normally Closed Solenoid Valve is a type of valve that utilizes an electromagnetic solenoid to control its operation. The valve itself remains closed when the solenoid is not energized, which means the passage for the fluid or gas is blocked. The valve opens only when electrical current flows through the solenoid coil, creating a magnetic field that moves the valve mechanism, allowing the flow of fluid or gas.