The electromagnetic valve for water is designed to regulate the passage of fluid. The device works according to the electromechanical principle. For the manufacture of the case, durable and universal, as well as high-strength materials, such as cast iron, brass, stainless steel, are selected. As for membranes and seals, they are made of highly elastic polymers. Among other things, the composition may be silicone rubber.
A similar device is installed in that part of the pipeline system to which easy access will be provided.
Solenoid valve device
A solenoid valve for water is also called a solenoid valve . It contains the main parts of the type of membrane, housing, spring, cover, stem, as well as an electric coil, which is a solenoid. The valve cover and valve body are cast in stainless steel, brass, polymer or cast iron. These devices are designed for use in a wide variety of working environments, temperatures and pressures.
For rods and plungers, magnetic materials are used. Electro coils, called solenoids, are made in a dustproof or sealed enclosure. High-quality enamel wire goes to winding coils. It is made of electrical copper. Connection to the piping system can be made using a shale or threaded method. A plug is used to connect to the electrical network. The control is performed by applying voltage to the coil.
Leading Working Positions
If we consider the above-described devices for execution, they can be normally closed or normally open. Among the varieties, bistable valves, which are called pulse valves, can also be distinguished. The control principle facilitates switching from closed to open position.
Operating principle
The electromagnetic valve for water can be used under various conditions, this involves the use of direct-acting devices, as well as devices operating at zero differential pressure. On sale you can find valves of indirect action, which are pilot. They operate exclusively at the smallest pressure drop.
Such devices can be divided into three-way distributing, shut-off and switching valves.
Seal and Membrane Information
The electromagnetic valve for water has membranes that can be made of flexible polymeric materials. The latter have a special design and chemical composition. Among other things, the latest silicone rubber compounds and other polymers are used in valve construction.
The principle of operation of the pilot valve
DIY solenoid valve for water can be installed quickly enough. If we are talking about a normally closed device, then in a static position there is no voltage, while the valve is in a closed state. The piston, which is a locking member, is hermetically pressed; it is located at the seat of the sealing surface. The pilot channel is closed. The pressure in the upper cavity is maintained by the bypass hole in the membrane.
A valve of this type is closed until the coil is subjected to voltage. In order for it to open, voltage must be supplied to the coil. Under the influence of a magnetic field, the plunger rises, opening the channel. For the reason that the diameter of the channel is much larger than the bypass, the pressure of the upper cavity decreases. The pressure difference affects the rise of the piston or diaphragm, which helps to open the valve. The water solenoid valve will remain open as long as the coil is energized.
The principle of operation of a normally open valve
Such a device works according to the opposite principle: in a static position, the device is in open form, but when the voltage rises, the valve closes. In order to keep the device closed, the voltage will be supplied to the coil for a long time. In order for any pilot valves to work correctly, a small pressure drop must be ensured.
Such devices are called valves of indirect action for the reason that in addition to supplying voltage, it is necessary to fulfill the condition, which is the pressure drop. It is possible to use such a device for heating systems, water supply, hot water supply, as well as pneumatic control. The unit is suitable for those conditions where pressure in the pipeline is present.
Direct Valve Operation
An electromagnetic valve, the circuit of which makes it possible to understand the principle of operation, can have a direct effect. Such a device does not have a pilot channel. In the central part is an elastic membrane that has a metal ring. Through the spring, it is connected to the plunger. When a magnetic field acts on the coil, the valve opens, the plunger rises and relieves the force from the membrane. The latter rises and helps to open the valve. At the moment when the closure occurs, the magnetic field is absent, the plunger lowers and acts on the membrane.
For such a device, a minimum pressure drop is not required. The electromagnetic valve, the photo of which is presented in the article, can be used in systems with pressure, as well as in drain tanks. You can install the device in the conditions of storage receivers. You can mount such a device in places where there is no pressure or is at a minimum level.
Features of the bistable valve
This valve can be in two stable positions: closed and open. Switching is carried out sequentially by applying a pulse to the coil. Such devices operate exclusively from a direct current source. In order to keep the valve in a closed or open position, it is not necessary to apply voltage. By design, such devices are made as pilot ones, which indicates the need for a minimum pressure drop.
The solenoid solenoid valve is a reliable and functional fittings for the piping system. If we are talking about special electromagnetic coils, then the resource of their work is very large. Until the failure, the device is able to work until the number of starts reaches 1 million. The time it takes for the magnetic valve to operate can be between 30 and 500 milliseconds. The final figure will depend on pressure, diameter and design.
Conclusion
The device of the electromagnetic valve was presented above, as well as the principle of its operation. Similar devices can be used as a remote control locking device. They are indispensable for safety in the role of shut-off, disconnecting and switching solenoid valves. These features must be considered before purchasing a valve and installing it under certain conditions.