Solenoid valve

Different types of solenoid valve

Solenoid valve or electric valve is a type of industrial valve which is used in different industries to manage the flow of different fluids. In the construction of solenoid valves, magnetic force is used to cut off and connect the current. Inside this valve there is a solenoid or central core with a coil. The passage of electricity through the coil generates electromagnetic force and can control the movement of the solenoid. These parts are used in different industries today due to their high accuracy and remote control. In the article What is a solenoid valve, we are going to talk about how the solenoid works and its types.

What is a solenoid valve?

If you are familiar with the concept of electromagnetism, you know that by making a coil and connecting an electric current to it, an electric magnet can be achieved. Solenoid valves are made from this simple physical concept. The main component of solenoid valves is the solenoid, which is located in the center of the valve and through which the milk needle passes. There is also a valve coil around the solenoid. As the current in the coil is connected, the solenoid acts as the core of the electric magnet, causing the motion to become linear and the needle of the valve to move. The advantage of solenoid valves over mechanical and manual valves is the possibility of controlling them remotely. Electric current can be established remotely and the flow path of the fluid can be opened or closed. Another point is the speed of response of solenoid valves to current changes. By installing different types of valves, fluid flow control can be managed. Stay tuned for the rest of the article What is a solenoid valve to learn more about this piece.

Internal components of solenoid valves

Solenoid valves have a simple engineering structure. Inside these valves you can see the following sections:

Valve body: which is usually made of stainless steel.

  • Fluid entry and exit point
  • Coils: To make the coils, copper wires with lacquer coating are used. The lacquer coating of the coil acts as insulation, also protects the wire from moisture, corrosion, fluid and..
  • The main frame of the coil: This frame is the main part of the solenoid and it is also known as the solenoid. The solenoid frame is made of steel sheets and becomes a magnet when the current is connected.
  • The connection of the wires

Needle and spring: The needle and spring rod are located in the center of the solenoid, doing the work of disconnecting and connecting the current.

Protection and maintenance

In solenoid valves, protection is important due to the passage of electricity through the coil. Especially since solenoids are used even in sensitive parts of the industry. So that any damage to the solenoid valve can cause irreparable damage to the entire production line. For this purpose, in their design, points are considered to protect it.

First, galvanized steel must be used to make these valves. So that it is resistant to corrosion due to the passage of fluids and environmental factors. The second point is the valve coil. The material of the wires is usually made of copper metal. Copper has good conductivity and is easily available. But the passage of corrosive fluids, such as industrial oils or acids, can also be a problem for coated wires. For this reason, greaseproof paper and insulation are used between the layered lines of the coil. In addition, the wire cover is also made of varnish and is resistant to corrosion and moisture.

The third point goes back to the solenoid valve cap. Electric valves are sometimes used to control the flow of flammable and explosive fluids such as diesel, gasoline, and so on. Naturally, any electrical connection to these fluids can be dangerous. In this case, solenoid valves with explosion-proof cap material should be used.

Types of solenoid valves

There are different categories for solenoid valves. These valves can be classified according to capacity, multi-directional flow or type of response.

In the classification of solenoid valves based on capacity, maximum and minimum working pressure are considered. Maximum working pressure (MWP) is the resistance of the valve to fluid pressure. This amount is one of the characteristics of solenoid valves and is engraved on the box, in which we will count the types of solenoid valves based on a conventional classification model.

Categorize based on how you respond

The most important form of solenoid valve classification is based on how the valve responds. In this way, solenoid valves are placed in two general categories:

Direct movement solenoid valves: In this case, the valve can only be open or closed. In fact, milk sensitivity is designed to be zero or one hundred.

Servo Valve Solenoid: These solenoid valves are constantly under the control of the system and control the flow of fluid according to the intensity of the current. Servo solenoid valves can also be divided into two other subcategories.

NC solenoid valves: Servo valves control fluid flow based on system response and the feedback it receives. Now this flow control can be done in two ways. The first case is when in the event of a power outage, the fluid flow is completely cut off. NC valves work this way. It is natural that with increasing current flow, the intensity of fluid flow will also increase.

NO solenoid valves: These valves work exactly the opposite of the NC solenoid system. In fact, when the power goes out, the NO solenoid valves will be fully open. Then, as the current increases, the valve gradually closes. The efficiency of NO and NC valves in controlling different currents.


Solenoid valves compared to manual and mecca valves perform better in industrial processes. These valves control the flow of fluid with the help of electromagnetic force and they can also be controlled remotely. The use of solenoid valves has increased due to better flow control and rapid response to system changes. We hope that the article What is a solenoid valve has been able to give you a good view of this part? If you have any questions or concerns, let us know in the comments section.

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