A Normally Open (NO) Solenoid Valve is an essential component in modern fluid control systems, widely used in industries ranging from water treatment to pneumatic automation. As its name suggests, a normally open solenoid valve remains in an open state when no electrical current is applied, allowing fluid or gas to pass freely. It only closes when energized, providing a simple yet effective method for controlling flow in various applications. Understanding the structure, working principle, and advantages of this valve is crucial for engineers, technicians, and system designers.