What Does Normally Open Mean for a Solenoid Valve?

Solenoid valves in construction machinery are important fluid control components, of which "normally open" is a common valve configuration. The following is a detailed explanation of what "normally open" means for solenoid valves and how they are used in construction machinery. Understanding this concept is essential to understanding how solenoid valves work and what they do in different applications.

 

The basic principle of solenoid valves

Before delving into "normally open", it is important to understand the basic principle of how a diesel solenoid valve works. A solenoid valve contains a coil, usually a wire wound on an insulating material. When an electric current is passed through this coil, it generates a strong magnetic field. Inside the solenoid valve, there is usually a ferrous or ferromagnetic valve. This valve is movable and is usually open. When current is passed through the coil, the magnetic field generated attracts or pulls the valve closed. When the valve is closed, it prevents a fluid (such as a liquid or gas) from passing through the solenoid valve, cutting off the flow path. This is the closed state of the solenoid valve. Once it is de-energized, the coil no longer produces a magnetic field, and the valve is acted upon by a spring or other force, it returns to its default open state. At this point the solenoid valve reopens the pathway, allowing the fluid to flow freely again. By controlling the opening and closing of the current, we can control the valve state of the solenoid valve. When the current is energized, the valve closes; when the current stops, the valve opens. This type of control allows for quick and accurate adjustment of fluid flow. Solenoid valves can be designed for two basic operating states: normally open and normally closed.

 

Meaning of normally open

By default the path is open: a normally open solenoid valve means that when no current is flowing through the coil, the valve is open, allowing fluid to pass freely. This is the opposite of a "normally closed" solenoid valve.

 

Fluid flow in the event of a power failure: In construction machinery, normally open solenoid valves are very useful because they keep the pathway open in the event of a power failure or interruption, ensuring that the fluid continues to flow. This is critical for certain applications, such as emergency shutdowns or systems with high safety requirements, and also helps to keep other diesel engine parts safe.

 

Applications in construction machinery

Hydraulic Systems: Open solenoid valves are often used in hydraulic systems to ensure that hydraulic fluid can continue to flow in the event of an electrical failure or other emergency, thus maintaining system stability and safety, as well as the proper functioning of other parts of the equipment such as starter motor and alternators.

 

Water supply systems: In construction machinery, normally open solenoid valves can also be used in water supply systems, especially for fire-fighting equipment. In this way, the fire-fighting equipment can be used at any time even if there is no power supply.

 

Air system: Often open solenoid valves can be used in the air system of construction machinery to ensure that air pressure is maintained to support a variety of operations and tasks.

 

Summarize

Usually open solenoid valves are important fluid control components in construction machinery, characterized by the fact that the pathway is open by default, which is essential to ensure that fluid continues to flow in an emergency. This valve configuration is widely used in a variety of construction machinery applications such as hydraulic, water and air systems to improve system reliability and safety. Understanding how normally open solenoid valves work is critical to effectively managing fluid control in construction machinery.