A Normally Closed (NC) Solenoid Valve is a type of electrically controlled valve that remains closed when no power is supplied to the solenoid coil. When electrical current is applied, the magnetic field created by the solenoid coil moves a plunger or armature, allowing the valve to open and permit the flow of fluids or gases. This simple yet effective valve design is widely used in various applications, ranging from industrial automation to household appliances.
Basic Operation of Normally Closed Solenoid Valves The core principle of a Normally Closed Solenoid Valve lies in its operation. Under normal circumstances (without electrical power), the valve is closed. This is achieved through the use of a spring or gravity that pushes the valve seat against the opening, preventing any fluid or gas from passing through. When electricity flows through the solenoid coil, it generates a magnetic field that attracts the plunger or armature inside the valve, lifting it away from the valve seat. This action opens the valve, allowing the fluid or gas to flow through the passage. When the power supply is cut off, the valve automatically closes again.