Controlling liquid or gaseous solutions or environments has been done not only mechanically for many years. Today’s industrial enterprises are continuously upgrading their main devices to meet all standards and requirements. In recent years, so-call solenoid valves have been use increasingly in industrial settings. As part of various technologies, a solenoid valve is a device that regulates the direction of gas or liquid flow. The solenoid valve works automatically and is control by an electric current. This current is supplier to the induction coil that is include in the solenoid valve.
What Is a Solenoid Valve?
An electromagnetic (solenoid) valve controls a working medium under pressure in a pipeline. As its name suggests, its primary job is to open and close the bore with a plunger, which is influenced by the magnetic field of a coil or amplification caused by the pressure of the working medium and the diaphragm.
Among the main components of a solenoid valve are:
- A valve body consists of an inlet, an outlet, and a seat.
- A reinforcement tube with a coil mounted on it.
- A plunger slides inside a reinforcement tube and, in some cases, serves as a seal.
- The electromagnetic coil creates a magnetic field need to move the plunger.
How Does a Solenoid Valve Work?
A copper induction coil, locate inside the closure device, is hermetically seal to prevent vapor, liquid, or gas particles from entering. In order to open or close the flow channel of the working medium. The retractable stem solenoid and the diaphragm are use.
When no current is present, the valve completely blocks the flow channel of the working medium or, on the contrary, leaves it completely open. Upon applying a voltage to the coil, the cored rod is displaced, resulting in an increase or decrease in flow cross-section.
For all types of solenoid valves, the principle of operation is very simple: electromagnetic induction moves the stem. In the center of a coil, an electromagnetic field is created when an electric current flows through it. The strength and direction of this field are determined by the applied voltage. Thus, the shut-off element of the valve moves, and the flow area of the channel increases or decreases.
Solenoid valve: area of use
Because solenoid designs are create to consider a specific environment. They can use in a range of fields. Solenoid valves are select base on their application area.
Based on modification, the solenoid valve coil can be operated with an operating voltage of 5 to 35 V DC or 220 V AC. Solenoid valves with low voltage are designed to operate in pipelines with a small diameter and low pressure inside the working medium. Their application is rather limit. It is possible to connect these valves to various microcontrollers. Thus integrating them into low-voltage control systems. Water supply and heating circuits are frequently connect and control with them in private households.
Solenoid is use almost everywhere in industrial enterprises, including in the following areas:
- Refineries and gas enterprises;
- Water, gas, and heat supplies;
- Ventilation and air conditioning;
- Sterilizers and irrigation:
- Food production pipelines, bottling systems for beverages, oils, and liquid substances.
Because the range of applications is quite extensive. The design features of each type can be adapt to a specific area of operation. Solenoid valves are design to work with specific mediums, temperatures, and pressure ranges. It is important to choose a solenoid valve carefully. If you are not sure which type of valve you need, the Aira Euro Automation team will help you decide and advise on all your questions.
All solenoids fall into one of three basic categories based on their connection type:
- Solenoid flanges;
- Solenoid clutches
- Choke solenoids.
Various types of materials have their own durability, temperature, and pressure properties that should be taken into consideration.
Also, read Asset Management of Industrial Valve & Maintenance
There are various types of solenoids depending on their internal structure
Solenoid valves are divide into three main types base on their construction:
- Poppet solenoid valves,
- Diaphragm ones,
- Piston valves.
Diaphragm solenoid valves are the most common choice for household applications. The sensors are typically instal on water supply systems and heating circuits when introducing automation, such as smart home systems.
When all these valves are considere base on the position of their closing element coupled to the de-energize solenoid of the coil, we find three basic types:
- The valve is normally close. When the solenoid is energize, the spring presses on the core, and the working medium is close.
- The valve is normally open. Upon energizing the solenoid, on the other hand, the working medium is open.
- Bistatic, working in both directions.
Choosing a solenoid valve based on its operating principle
In terms of operation, there are two main types of solenoid operate valves.
1. Indirect solenoid valve. A variety of connection sizes are available for this type of valve. When the diameter of the coil is larger. The static pressure of the working medium increases, and the magnetic field created by the coil must be able to handle this. A servo-controlled valve achieves this. In this design, the medium pressure helps maintain the seal on the main valve.
- Direct-acting solenoid valve. An inlet and an outlet are located in the body of the two-way valve. It can operate at zero pressure.
By their acting, Any voltage of solenoid valves can use:
- A single-acting solenoid valve with one branch pipe for connection to a pipeline. For the rapid release of steam or liquid when pressure is too high, it is use as a safety element.
- The most popular solenoid valves have two branch pipes for both entering and exiting the flow. They are install at pipeline ruptures to connect two pipes.
- Heating systems rely on triple-action valves. By using them, you can easily redirect the flow of water or gas between circuits.
What Are the Solenoid Valves by Type of Seal and Diaphragm?
There are also several options to choose from when it comes to diaphragm solenoids. The solenoid valve diaphragm is located within the housing to shut off the fluid flow. Additionally, a sealant layer is usually applie between the coil and the nozzles. Each of these components is compose of polymer materials. Therefore, the seal is usually made from:
EPDM is an inexpensive polymer that resists salts, acids, and alkalis
FPM which is resistant to oils, gasoline, and has the greatest temperature range,
NBR is a polymer that tolerates oils.
It is important to pay attention to the type of seal in the valve based on the scope of application. Membranes should also be select accordingly.
There is a wide variety of solenoid valves available on the market. It is also essential to choose components that are reliable and workable and to rely on several key characteristics at once. This is the type of connection, design features, the principle of operation, number of nozzles, the material of the valve itself, and its seal and membrane.
It is better to purchase a solenoid valve from Aira Euro Automation in order to get reliable solenoids. We partner with the best manufacturers of industrial equipment and are always happy to assist you in choosing solenoid valves for your pipeline.
Aira Euro Automation is a manufacturer and supplier of water solenoid valve 24v in India, They have a huge chain of industrial valves and Solenoid Valves.