El magnetic valve for gas. Solenoid valves for gas

The gas valve is a type pipe fittings responsible for monitoring and regulating the working environment, as well as for distributing and blocking the flow of the gas pipeline. Thus, the functioning of this device is based on very important functions. In the article we will consider what gas valves for the boiler are and note them. distinctive features.

Check price and buy heating equipment and related products you can with us. Write, call and come to one of the stores in your city. Delivery across all territory of the Russian Federation and the CIS countries.

Honeywell gas valve

Purpose and principle of operation of the gas solenoid valve

Electromagnetic gas valve- This is a device that allows you to adjust the supply of natural gas in automatic mode.

With such devices, the use of natural gas is safer.

If a leak occurs, then solenoid valve for gas boiler to the maximum short time it will independently block the pipeline and will not allow toxins, which are very dangerous substances for humans, to enter the room.

After the valve relay begins to supply electricity to the coil, the armature retracts and begins to lift the plunger, thus opening free access for gas to the working environment.

After the voltage is turned off, the plunger returns to its original position and closes the channel between the inlet and outlet fittings, thereby preventing gas from flowing. The main purpose of such a device is to distribute and regulate the gas supply in pipelines, boilers, columns and other devices.

Varieties

Gas valves for the boiler are classified according to a number of criteria. The first of which is the number of inputs. Based on this indicator, the following types of valves are distinguished:

1. Two-way. They are structures that have two openings - inlet and outlet. Their main application is to block the flow or open the flow of the working medium of the pipeline.
2. Three-way. These machines have one inlet and two outlets. Such valves perform shut-off, control and redirect functions.
3. Four-way. There are four holes in such gas valves: three outlets, one inlet. In their work, they are similar to three-way valves, only thanks to one more additional input, their scope is slightly expanded.

The following classification is the type of valve control:

1. Mechanisms with manual control. Represent simple designs, the shutter of which begins to work at the moment when the control wheel or lever is turned. The main distinguishing features of such valves are high reliability and low price.
2. Solenoid valves. Due to the fact that their design includes an electric drive, they can operate in automatic mode. Typically, such devices are used in industrial gas pipelines, heating networks and production lines.

Seitron gas shut-off solenoid valve with manual reset

In turn, electromagnetic gas valves are classified based on the position of the shutter that it takes in the case when the electricity is turned off:

1. Normally open. Such valves, when the electricity is turned off, go into the open position, thus ensuring the free movement of the working medium in the pipeline.
2. normally closed. When there is no power supply, the shutter takes the closed position and shuts off the gas flow in the system.
3. Universal valves. Such mechanisms, when the power supply is turned off, remain in the same position in which they were before.

Also, based on functional purpose, there are two types of valves.

So, for example, a check gas valve: such devices are designed to protect the pipeline from the circulation of the working medium in the opposite direction. Due to the design features of the mechanism, where it is involved check valve, it is possible to pass current only in a given direction. This is the principle of its operation.

The main purpose of the check valve is to protect the pipeline. Usually such devices are mounted near the gas equipment: storage tanks, transfer pumps, columns, gas boilers and reducers, because this is how the check valve prevents the flame from being directed towards the appliances.

Gas safety valve is responsible for the same processes as the check valve. It is a safety device that prevents emergencies from occurring due to sudden pressure drops in the system.

These valves automatically shut off the gas supply in situations where the pressure of the working medium is out of range or, on the contrary, does not reach it.

Many users often resort to installing on a safety stop valve temperature controller, air gas content meter, working medium pressure sensor.

Gas valve selection

In order to choose an electromagnetic gas valve, attention should be paid to a number of nuances:

1. Firstly, it is necessary to decide on the place where it will be used and, based on this, it is already necessary to look at the properties that it should be characterized by.
2. Electrical service. It is best to give preference to a valve with low power and intrinsic safety or with additional manual adjustment.
3. Pressure. When choosing a valve, be sure to specify what pressure is on the pipeline. It must not exceed the nominal pressure additional equipment because too much pressure can damage the mechanism.
4. Mains voltage. This indicator should be given Special attention, since increased / decreased voltage can lead to a negative outcome - the valve can simply break.
5. Environment. It is also important to pay attention to the conditions in which the valve will operate. It is important that the technical characteristics of the valve are similar to the characteristics of the working environment: humidity, vibrations, temperature changes, etc.

Manufacturers

Consider the most popular companies that manufacture gas valves.

Dungs

The German company, which is one of the most popular in the production of gas control valves.

Dungs products began to appear on Russian market since 1999 and have been able to firmly consolidate their positions. Users constantly purchase products from this manufacturer because they are of high quality, reliability and long service life.

Double gas valve device DUNGS type DMV

The only drawback that can be noted is the high price.

Dungs' most technological development in the mass segment is the Dungs DMV-D valve - a two-way device, which, in fact, is a connection of two independent valves in one compact housing. Thanks to their technical specifications it can function in a working environment with high pressure(up to 500 mbar). The cost of devices starts at about 12,000 rubles.

SIT GROUP

The Italian manufacturer SIT GROUP started its activity in 1953. The company has existed for more than 60 years and during this time has managed to establish itself extremely positively. The company's products are widely used due to the optimal price / quality ratio.

Gas valve SIT 845 SIGMA

The Sit 845 Sigma valve is the most popular device you can buy in the budget price range. The 845 Sigma gas valve has a two-way design that can be mounted on gas-consuming appliances from most common manufacturers, it will also work for a gas boiler.
This valve is equipped with an electric drive, therefore, its operation requires a constant voltage of 220 volts, in the absence of which the valve locking mechanism takes the closed position. The main advantages of the 845 Sigma are the minimum turn-on period of the valve and its compact size.

The model allows you to adjust the boundary level of gas pressure at the outlet. Installation of the device on the pipeline is carried out by means of a flange connection. A valve for a gas boiler Sit 845 Sigma can be bought for about 6,000 rubles.

Thus, the gas valve is responsible for the automatic supply of gas.

Modern gas equipment in heat supply systems provides for the use of a wide range of pipeline fittings. These are means of regulation, protection and control, providing a stable and safe work target unit. Thus, a new generation of shut-off valves is an electromagnetic gas valve designed to distribute and regulate the flow of the working mixture.

Fixture design

Solenoid valves are also called solenoid valves, since their basis is formed by a solenoid in the form of a coil. He is enclosed in metal case, complete with lid and outlets. In addition, the working structure is made up of pistons, spring block and a stem with a plunger, which directly control the gas solenoid valve. The design of the coil may differ depending on the type of medium and its pressure, but most often it is a winding with a high-quality enamel wire in a dustproof case. The conductors are made of electrical copper.

Depending on the type of equipment can be used different configurations connecting system. For geysers, a flanged or threaded method of interfacing with a pipeline is usually used. The network connection in the case of domestic circuits is carried out through a 220 V plug. In the future, the electromagnetic gas valve can be supplemented with auxiliary fittings and control and measuring devices.

Performance properties of materials

Since it initially focuses on special conditions of use, special plastics are used for the basis of the design. For example, EPDM polymer provides the device with resistance to chemical attack, aging and pressure drops. With this design, the valve can be used in temperature conditions from -40 to 140 °C, but it is not recommended to use it in gasoline and hydrocarbon environments. Another modern variation of the polymer alloy is PTFE. It is a polytetrafluoroethylene capable of withstanding high concentration acid mixtures. AT this case contact with aggressive gaseous media and operation in the temperature range from -50 to 200 °С. The use of PTFE polymer is not recommended where there is a risk of contact with trifluoride chloride and alkali metals. At the same time, protective qualities are not always the main requirement for a solenoid valve. Shut-off gas fittings for the same household supply networks may well be made of inexpensive elastic polymers like nitrile butadiene with a rubber base. This material copes well with the maintenance of butane and propane mixtures, but at the same time is afraid of strong oxidizing agents and ultraviolet radiation.

The principle of operation of the solenoid valve

The state of the valve is affected by an electromagnetic coil, the impulses of which actuate the locking elements. The static position of the valve is characterized by its closed position. In this position, the closing membrane or piston element is hermetically pressed against the outlet circuit, preventing the passage of the working mixture. The clamping force is also provided by direct pressure from the gas mixture from the side of the passage. On the main branch pipe, the electromagnetic gas valve is additionally locked by a plunger until the voltage in the coil changes. At the moment of impact magnetic field in the solenoid, the central channel begins to open, where the spring-loaded plunger is located. As the pressure balance changes from different sides valve changes its state and the piston group with the membrane. The armature is in this position until the voltage on the coil decreases.

Features of a normally open valve

The principle of operation of the most common statically closed design has been described above. In the case of normal open valve regulation is different. In the normal position, the locking elements provide a free passage for gas mixtures, and the supply of voltage, respectively, leads to closure. Moreover, the retention of a long closed state for safety purposes is possible only with long-term and stable support of a given voltage. An even more functional solenoid valve for a gas boiler does not operate directly, but with a technological pause. Within a short period of time, the system evaluates whether other safety conditions are met in the mixture circuit. Coil voltage as such does not initiate valve closure. But if the indirect conditions are met, then it fires automatically. The decisive factor, in particular, can be a certain voltage value, the same stability or a given amplitude of pressure drops.

Device Varieties

Valve regulators for geysers are distinguished by the number of output channels. Usually two-, three- and four-way models are used. The basic two-way version has an inlet and outlet channel, and during operation, respectively, serves to supply and close the connecting node. As the design becomes more complex, the number of inlets increases. The three-way gas solenoid valve, in particular, provides not only throughput, but also the redirection of the working environment to one or another circuit. Devices with four channels actually operate on the principle of a collector, distributing gas through different supply lines.

Conclusion

When choosing the right shut-off valve, it is important to take into account many technical and operational parameters. At a minimum, you should rely on the design and electrical characteristics that will allow you to correctly integrate the device into the target channel. As for the protective qualities, it is desirable to give preference to solenoid valves for a geyser with an IP65 insulation class. Such products are characterized by dust, moisture and shock resistance, which ensures a long service life. With regard to the connection configuration and principle of operation, the choice should be made based on the nature of the operation of the column, the volume of gas supply and other nuances of the equipment.

One of the key elements influencing the operation of the gas-cylinder equipment system is the electromagnetic gas valve (EGC). Different specialists call this system node differently, for example, simply a gas valve or an HBO solenoid valve. It is about this node of gas-cylinder equipment and will be discussed in our article today.

First of all, it should be noted that inexperienced users often confuse the HBO electromagnetic gas valve and - remember, these are different components of the system that perform completely different functions and have a completely different structure!

The HBO solenoid valve performs a shut-off function in the system, i.e. it opens and shuts off the gas supply to while the car is parked, or while the engine is running on gasoline. It should be noted that without power supply (+12v to the coil), the HBO valve is in the closed state and prevents the flow of gas from the line to the reducer.

HBO valve device

Depending on the models and manufacturer, the HBO valve device may vary, but often consists of the following elements:

• Core;
• Valve with return spring;
• Electric coil with winding;
• Gaskets and seals;
• Coarse filter. Quite often, the HBO valve is equipped with a coarse fuel filter, but this equipment is not required.

Installation and working principle

Installation

It should be noted that different installers of gas equipment systems install a different number of electromagnetic gas valves on a car.

1. The cheapest and most common scheme is the installation of one EHC directly on the evaporator reducer.
2. More expensive scheme implies the presence of two parallel HBO valves: one is installed on the gearbox, the second on the multivalve flow line or after the multivalve and shuts off the gas supply to the line.
3. The last, most reliable and expensive option has three devices parallel to each other: the first is still located on the gearbox, the second (backup or safety) is installed in front of the gearbox, and the third is on / after the multivalve, near the cylinder.

Principle of operation

The principle of operation of the HBO valve is as follows:

• Initially, the HBO valve is in the closed state.
• After the car is ready to switch to gas, the ECU (or the driver pressing the gas-gasoline button) sends a signal (+12 v) to the EGC coil, the magnetic coil is activated, raising the shut-off valve (a characteristic click is heard).
• After opening the HBO solenoid valve, the gas enters the coarse filter, and then into the evaporator reducer.

Possible malfunctions and breakdowns

Like any element of the system, the HBO gas valve is prone to breakdowns, and since, as we found out above, this element of the system performs a locking function, without its proper operation, the car most likely will not switch to gas. And although the cost of this system node is not high, it is not always possible to purchase a new HBO valve, therefore, in order to repair a broken one, you need to have an idea of ​​the most common breakdowns of this element.

Mechanism contamination

The HBO solenoid valve works in the engine compartment, which means it is exposed to dust, dirt, rust, scale and other debris that can get inside the device, preventing the valve from opening. In this case, disassembly and simple cleaning of the device from foreign objects will help.

Filter clogged

Most valves that are installed in front of the gearbox have a coarse filter, which, although not directly related to valve failure, can provoke unstable operation of the entire HBO system or make it impossible to switch to gas at all. In this case, the filter should be replaced. It is recommended to do this at least 2 times a year or every 10,000 km (whichever comes first).