A Normally Closed Solenoid Valve (NC Valve) is an essential component in many fluid and gas control systems. It operates by using an electromagnetic solenoid to open or close a valve depending on whether the solenoid is energized or de-energized. This type of valve is designed to remain closed in its default, unpowered state and only opens when power is applied to the solenoid. This basic yet highly functional design makes the normally closed solenoid valve versatile and reliable in a variety of industrial and commercial applications.
How Does a Normally Closed Solenoid Valve Work? At its core, a normally closed solenoid valve consists of two main parts： the solenoid coil and the valve body. The solenoid is an electromagnet that controls the valve’s operation by creating a magnetic field when energized. The valve body contains a plunger, which is moved by the magnetic field created by the solenoid. The plunger’s movement either opens or closes a passage for fluid or gas. When the solenoid is not powered (i.e., the system is “off”), the valve is in its “normally closed” state, meaning the plunger is pressed against the valve seat, blocking the flow. When electricity is supplied to the solenoid, the magnetic field pulls the plunger away from the valve seat, allowing fluid or gas to flow through. Once the power is turned off, the spring inside the valve pushes the plunger back into its original position, closing the valve.