To control hydraulic systems and drives, valves are necessary, which redirect the flow of the working medium to the appropriate place. Switching their state remotely is possible with the help of an electrical system. The operator, by pressing buttons and pulling levers, can control the entire system from one place. This solution also works in semi-automatic and automatic hydraulic systems. Check in which specific cases solenoid valves are most often used.
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Where are solenoid valves used?
Solenoid valves are widely used in industrial automation systems. They are also elements of construction machinery systems. They can be found in passenger cars or home hydraulic systems. Solenoid valves They allow for precise control of the flow of water, gases and working fluids. In connection with this, various types of solenoid valves can be distinguished.
Diaphragm solenoid valve
In industrial applications, diaphragm solenoid valves are most often used. The material from which the diaphragm is made has a great significance for the application of a given valve. Ethylene-propylene-diene, called EPDM, can operate up to 140°C. Unfortunately, this solution does not work when working with oiled air, because the valve is quickly damaged. Therefore, diaphragms made of acrylonitrile-butadiene rubber (NBR, up to 90°C) or fluorine rubber (FKM, up to 140°C) are used.
Methods of operation and use of solenoid valves
There are three types of solenoid valves based on their operation:
- Direct acting solenoid valve. Their biggest advantage is the ability to open at a differential pressure of 0 bar, so even without a working medium in the system. However, this is also associated with their biggest disadvantage - opening the flow requires significant energy, which means that the flow diameter is limited to 3/8'' by most manufacturers.
- Indirect acting solenoid valve. They have small servomotors that are supported by the pressure difference on both sides of the membrane. In order to open the flow, it is enough to unblock a small channel used to equalize the pressure of the working medium.
- Combined action valves. Combines the advantages of both previously mentioned solutions. A small piston is attached directly to the diaphragm, unblocking a small hole. In this way, the pressure difference on both sides can be equalized. However, the presence of a working medium is not required to close or open the flow.
When choosing the right model, you should first and foremost pay attention to the valve diameter and the need for it to operate without pressure inside the installation. These factors mainly determine which solution will work best.
What models of solenoid valves can be found on Onninen?
Onninen Installation Wholesaler supplies a complete selection of solenoid valves for all applications.
EV shut-off solenoid valves are very popular, including the Danfoss EV 220A NC G1/2" shut-off solenoid valve , used in pneumatic systems. Some of them are sold as a valve only, without an electric coil responsible for its control. However, the wholesaler's offer also includes DC 24V coils, including a coil for the Danfoss BN 24V DC max 160C solenoid valve , operating at temperatures of 160°C or higher. You can easily complete the entire order.
You should also pay attention to the type of device. The Socla 1/2" WKB2 solenoid valve with a coil (sold complete with a coil) requires an electrical signal to open the flow of the working fluid.
In contrast, the Socla 3/4" WZB2 solenoid valve with a coil (also with an electric coil) cuts off the flow under the influence of the voltage that appears. The difference between them is revealed primarily in the event of a system failure. Then the current flow stops and the valve sets itself in the initial position.
For very large diameters, it is worth choosing a flanged solenoid valve DN65 230VAC . This is an excellent solution for high pressures and flows, because the mounting is very strong and durable.
An electrovalve for every need
Many installations of systems and systems require control of the flow of the working fluid for proper operation. The solenoid valve allows for the supply of automatic control systems, compatible with the programmed controller, and the opening and closing of the flow takes place without the participation of the operator. However, not every model will work equally well. Therefore, call us or write if you have any doubts when choosing the right solenoid valve. We will always help, using our knowledge and experience.