Title: The Role and Working Principle of Normally Closed Solenoid Valve in Modern Automation

The Normally Closed Solenoid Valve (often abbreviated as NC solenoid valve) is one of the most common and essential components used in modern automation systems. As its name implies, this type of solenoid valve remains closed when no electrical power is applied and opens only when electricity energizes the coil. This unique feature makes it an ideal solution for applications where safety, reliability, and controlled fluid flow are crucial. A solenoid valve is an electromechanically operated device that controls the flow of liquids or gases. It typically consists of a coil, a plunger (or armature), and a valve body. When the valve is in its normally closed state, a spring pushes the plunger down against the valve seat, sealing the passage and preventing any fluid from flowing through. Once the coil is energized, it generates a magnetic field that lifts the plunger, thereby opening the valve and allowing fluid to pass. When the electric current is cut off, the magnetic field disappears, and the spring returns the valve to its original closed position.