What Are The Differences Between Normally Closed and Normally Open Solenoid Valve?

Among the various characteristics of solenoid valves, two fundamental characteristics stand out: normally closed (NC) and normally open (NO). In this blog post, we will explore the differences between these two types of solenoid valves, going in-depth about each one and where they are utilized.

Solenoid valves are commonly used in various industrial and commercial applications. They are electromechanical devices that control the flow of fluids or gases through a system by using an electric current to activate the valve. There are two primary types of solenoid valves: normally closed and normally open.

Normally Closed

Designed to remain closed when there is no electrical current running through it. The valve's default state is to block the flow of fluid, ensuring that the passage is sealed off when the solenoid coil is not energized. When an electrical current is applied, the solenoid activates, opening or closing the valve to control fluid flow. This type of valve is commonly used in systems where safety and containment are critical. It is often selected for applications where the fluid needs to be blocked by default, only opening when the solenoid is energized.

Normally Open

On the other hand, a normally open solenoid valve defaults to an open position when the solenoid coil is not energized. In this configuration, the valve allows the fluid to flow freely when at rest. When an electrical current is applied, the solenoid coil activates, closing the valve and blocking the flow of fluid. Normally open solenoid valves are often chosen for applications where constant fluid flow is desirable, and the valve needs to close temporarily when activated.

Both types of solenoid valves are widely used in various industries, including HVAC, water treatment, chemical processing, and many others. They offer a reliable and efficient way to control the flow of fluids or gases in a system.

Where Are These Valves Used?

When it comes to selecting the right valve for controlling the flow of fluids, it's important to know the difference between normally closed (NC) and normally open (NO) solenoid valves. 

Some systems use both NC and NO valves to meet specific control requirements, providing tailored fluid regulation.

Conclusion

The choice between normally closed and normally open solenoid valves plays a pivotal role in determining the efficiency and safety of various applications. Engineers and operators, armed with an understanding of these fundamental differences, can make informed decisions to ensure the seamless and precise control of liquids and gases in diverse industrial settings.