A Normally Closed solenoid valve is a type of valve that remains in the closed position when no electrical power is supplied to the solenoid coil. It operates based on the principle of electromagnetism, where the solenoid coil, when energized, creates a magnetic field that moves a plunger or armature to open the valve, allowing the flow of liquid or gas. Once the electrical current is turned off, the spring mechanism inside the valve forces the valve back into the closed position.

    The Normally Closed solenoid valve is used in systems where the default position needs to be closed, ensuring that the fluid or gas flow is interrupted when the valve is not actively being controlled. This type of valve is widely used in safety-critical applications, where a failure to close could lead to hazardous situations.