understanding the normally closed solenoid valve: how it works and its applications
Release time:2025-07-17 10:54:14
The Normally Closed (NC) Solenoid Valve is an essential component in many fluid control systems across various industries, including automation, safety, and water treatment. This valve operates based on a simple but effective principle: it stays closed under normal conditions (i.e., when de-energized) and opens when an electrical current is applied to activate the solenoid. In this article, we will explore the mechanism behind the Normally Closed solenoid valve, its applications, and why it is a crucial part of many systems.
How Does a Normally Closed Solenoid Valve Work?
At the heart of any solenoid valve is an electromagnet, or solenoid coil, which plays a critical role in its operation. The valve’s structure typically consists of a body, an inlet and outlet for fluid, a plunger, and a spring. When the valve is in its default state (de-energized), the spring keeps the plunger in a closed position, sealing the valve and preventing any fluid from passing through. This is the "Normally Closed" state.
When the solenoid coil is energized, it generates a magnetic field that attracts the plunger, lifting it off its seat. This action opens the valve, allowing fluid to flow freely from the inlet to the outlet. As soon as the electrical current is switched off, the magnetic field disappears, and the spring force causes the plunger to return to its closed position, thus halting the flow of fluid once again.
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