What is a Normally Open Solenoid Valve?

What is a Normally Open Solenoid Valve? Solenoid valves, which are used in many industries today, play a vital role in controlling fluids. Although there are different types of these valves, the term “normally open solenoid valve” is frequently encountered. So, what is a normally open solenoid valve and what is it used for? In this article, you will find detailed information about what a normally open solenoid valve is, how it works, its areas of application, and the differences between normally open solenoid valves and other types of solenoid valves.

What is a Normally Open Solenoid Valve?

A normally open solenoid valve is a type of solenoid valve that allows fluid to pass as long as no electrical power is applied. Simply put, these valves are naturally in the open position and are closed by an electrical signal. This is the opposite of normally closed solenoid valves. Normally closed valves, on the other hand, open when electrical power is applied.

Operating Principle

The operating principle of normally open solenoid valves is quite simple. A piston or diaphragm located inside the valve creates a magnetic field when the electrical coil is energized. This magnetic field moves the piston or diaphragm, closing the internal passage of the valve and stopping the flow. When the electrical power is cut off, the piston or diaphragm returns to its original position by means of a spring or another mechanical force, and the valve opens again.

Applications of Normally Open Solenoid Valves

Normally open solenoid valves are used in many different industries and applications. Some of these include:

• Pneumatic systems: They are frequently used to control air or other gases.
• Hydraulic systems: They are used to control liquids such as oil.
• Automation systems: They are used in industrial automation systems for controlling machines and equipment.
• Heating and cooling systems: They are used to control the flow of liquids.
• Food and beverage industry: They are used to control liquids and gases in production processes.

Differences Between Normally Open and Normally Closed Solenoid Valves

The most fundamental difference between these valves is their default (natural) state. Normally open valves are naturally open, while normally closed valves are naturally closed. This difference requires selecting different valve types for different applications. For example, using a normally open valve in an emergency shutdown system can be safer in certain cases.

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