As you know, the main prerequisite for doing any work is to have correct information about that subject. Regarding selection, reviewing the prices, buying, and getting to know more about solenoid valves, the following information is included so that you, dear visitors of the specialized website of DamaTajhiz, can use these tips to choose and buy various types of solenoid valves from Brahma, Rapa, Chrome, Madas, Danfus, Dongs, Parker, Unidi, etc. brands in bulk.
A guide to choosing and buying a solenoid valve
A solenoid valve is an electromechanical valve used to cut off and connect the flow path of various gases and liquids. The function of the solenoid valve is that when the fluid flow passes, the solenoid converts electrical energy into mechanical energy to open and close the valve. There is a coil on the solenoid valve, which turns the fluid flow on and off when the electric current enters the coil. In general, solenoid or solenoid valves, regardless of the passing fluid and their working pressure, consist of two parts: body and solenoid (bobbin); the body part includes the main valve and consists of the inlet, outlet, diaphragm, and diaphragm spring. The solenoid includes an iron rod, spring, coil, valve, and control channel. Join us in introducing and checking the performance of different types of solenoid valves in the rest of this article (for wholesale purchase).
Solenoid valves or solenoid valves are divided into three categories: two-way, three-way, and four-way.
Junction solenoid valves are generally open or closed.
In three-way solenoid valves, the input fluid is directed to one of the two output paths, one of the output paths is open, and the other is closed.
Crossroad electric valves are similar to two electric valves connected and have two inputs and two outputs.
To express the function of a solenoid valve, if we assume a solenoid valve is closed and the passing fluid is water, we will see the following function:
After entering, the water puts pressure on the diaphragm at points A and B with the pressure of a spring, the diaphragm is compressed downwards, and the water passes through the small opening on the diaphragm and enters from part A to part B. The water passing through the opening fills chamber B; thus, the pressure is equalized at both ends of the diaphragm. The weak spring pressure, which caused equalization of the pressure at both ends of the diaphragm, caused the valve to close, and the water flow will not pass through the valve.
As mentioned earlier, the function of the solenoid or coil is to convert electrical energy into mechanical energy. When the solenoid is energized, its magnetic force pulls rod C upwards, the control valve E is opened, and a small flow of water is directed from part B and through channel G to the outlet. In this stage, the pressure in part B decreases, and the pressure in part A, which is the upper part of the diaphragm, increases, and the diaphragm is pushed up. The main valve is opened this way, and water flows directly from parts A to F.
When the solenoid is deactivated, the control path E is closed by rod C, and the spring pushes the diaphragm down with a tiny force, and as a result, the main path of the valve is closed. So, if the pressure above the diaphragm is higher than the inlet pressure, the solenoid valve will not work.
Application of solenoid valves
In the water pipe of the heating or cooling system of refrigeration and air conditioning systems
In controlling the passage of fluid through the fuel pipes of combustion equipment and especially engines
In the control of cylinders in high-power pneumatic and hydraulic systems
In the control of cylinders in high-power pneumatic and hydraulic systems
In domestic machines such as dishwashers and washing machines to control the water flow into the machine
In the oil, gas, and petrochemical industries
In industrial and automatic sprinkler systems
And so on
Advantages of solenoid valves
Quick connect and disconnect
High reliability
Long service
Integrated design
Low power consumption
Application in various industries
Possibility of manual control during a power outage
Easy repairs and maintenance
Types of solenoid valves
There are different types of electric valves, which are described below:
Hydraulic solenoid valve
It refers to a valve that operates with the help of electricity. Its task is to control the amount of fluid or liquid flow in a hydraulic system and, when necessary, disconnect and connect or adjust the pressure. There are two hydraulic solenoid valves, one head and two heads.
Pneumatic solenoid valve
Pneumatics is compressed air that is received and compressed by a compressor. Along the path of sending compressed air, it is necessary to use solenoid valves to control air pressure, output, and delivery. Among the uses of these solenoid valves, we can mention automatic doors depending on the pneumatic system.
Types of hydraulic solenoid valves
Hydraulic control valve
Hydraulic distributor valve with pilot
Hydraulic pressure control valve
Application of hydraulic valves
steel industry
Cement industries
heavy Industries
Automotive industry
Production lines of hydraulic machines
Airplanes and aviation and space industries
Types of pneumatic solenoid valves
Manual pneumatic valve
Proportional pressure balancing pneumatic valve
Modular pneumatic valve
Application of pneumatic valves
Food industry automation
Pharmaceutical industry
chemical industry
Automotive industry
Tile and ceramic industries
production lines
and many other industries
What is a solenoid valve?
A solenoid valve refers to a valve that operates by electricity and magnetic force. A solenoid valve is a coil wrapped around an iron core, and when the electric current passes through it, it produces a magnetic field and causes the core to move linearly. Therefore, the solenoid valve converts electrical energy into linear motion. A solenoid valve is a device used to control fluids such as gases and liquids. Some electric valves can open or close from 0 to 100% by receiving an electric command, which is very important in automatic and industrial machines.
Solenoid valve components
body
Fluid inlet
fluid outlet
Rewind
Coil frame
Connecting the wires
metal bar
spring
outlet valve
Types of electric valves
Direct motion solenoid valves: These are divided into two types, normally open and normally closed
Servo solenoid valve: These solenoid valves can be completely open or closed based on the pressure difference in the diaphragm, even when the fluid flow is interrupted.
Solenoid valve (NC (Normally closed)
NC, or normally closed solenoid valve, cuts off the fluid flow when the electricity is cut off and when the current is reconnected, the valve opens and allows the fluid to flow.
Solenoid valve (NO (Normally Open)
These solenoid valves allow fluid flow when the current is cut off, and when the electricity is connected, the flow path of the solenoid valve is closed and does not allow the fluid to pass.
Maximum working pressure or MWP (Max Work Pressure)
The maximum working pressure (MWP) is equal to the maximum working pressure of the system to operate the valve or system components without damage.
The maximum opening pressure difference (MAXODP)
The maximum opening pressure difference (MAXODP) equals the maximum pressure difference the valve can open in this state.
Alternating current solenoid valves usually have a higher working pressure.
Minimum working pressure difference or (MINOPD)
The minimum working pressure difference (MINOPD) equals the pressure required to open the solenoid valve. When this pressure is too low, the diaphragm or piston of the solenoid valve cannot remain open.
Solenoid valve capacity
The capacity of the solenoid valve is expressed in the KV unit, and it expresses the amount of water flow (based on cubic meters per hour) with a pressure drop of 1 bar in the solenoid valve.
Essential points in choosing a solenoid valve
Current and voltage
Voltage type
Maximum time on
type of milk
Opening size
The amount of pressure
Fluid and environment in which the valve can work
Connection type for each device
In the following, we will introduce some of the commonly used types of solenoid valves in facilities:
Electric water valve
Gas solenoid valve
Steam solenoid valve
Diesel solenoid valve
2-way solenoid valve
Three-way solenoid valve
Diesel solenoid valve
The diesel solenoid valve is used to pass fuel from the pump to the diesel nozzle. It causes that when the burner is turned off, diesel does not leak into the combustion chamber. When the burner is started, fuel is sprayed for about 15 seconds, the anti-generator is activated, and the air inside the boiler is removed. During this time, the diesel route must be closed, and an electric valve does this.
Gas solenoid valve
In devices that use gas fuel, there is always a risk of explosion. For example, the burner of the engine house uses a solid spark to ignite the gas, which can cause an explosion due to the gas's high pressure and the burner's vital spark. To prevent this explosion, they use a variety of pilot, gradual, and safety solenoid valves in the burner fuel path.
The function of the gas solenoid valve is that the solenoid valve operates in two stages. First, the solenoid valve is half open in the first stage, and it enters the gas with a bit of pressure into the burner; after the burner is turned on, the solenoid valve is fully opened, and the gas enters the burner ultimately. These solenoid valves have a primary gas pressure adjustment screw.
Water solenoid valve
The water solenoid valve controls the flow of water inside the pipe and the electric current. The electric water valve needs initial pressure inside the pipe (for example, at least 0.5 mbar for small valves) to function appropriately (open and close). Water solenoid valves are used in various industries, agriculture, domestic use, etc., such as turning off and on the flow, combining two flows, drip irrigation, fogging, etc. In case of failure, it is possible to replace the defective part (such as a bobbin or solenoid) to There is simplicity.
The effect of a solenoid valve on energy loss
Standard valves used in engine houses are usually opened or closed based on the type of operation when necessary. After some time, due to fluid deposits, air humidity, dryness of the valves, etc., they are entirely open or not closed. In environments like the engine room, they cause loss of fluid energy or the heat of the water in the engine room. An electric valve is used to prevent this problem.
Failure factors in solenoid valves
Lack of alignment and lubrication prevents fluid transfer.
Use of improper voltage
Broken parts such as hinges or levers
Repetitive disconnection and disconnection of the electric valve and its heating
Breaking the electrical clamp or cutting the electrical current connection wire
Solenoid valve leakage is due to mass, garbage, scratched seats, torn seals, lack of or inappropriate lubrication, heat, and humidity.
Cap is not in place
Advantages of solenoid valves
Easy installation
Installation in dangerous places with chemical vapors or explosive or scorching environments
Shortening the piping path and easier fluid discharge from the pipeline
Ability to control remotely or from the control room
High safety
energy saving
In the Solenoid valve group of the Damatajhiz reference site, information and prices of all types of solenoid valves, including water solenoid valves, steam solenoid valves, gas solenoid valves, intersection solenoid valves, etc., from brands such as Dangs, Parker, Danfoss, Unidi, Shokouh And so on it has been provided with the original warranty for your review and purchase, dear users and employers.
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