The use of gas for heating a private house or cottage is very convenient and cost-effective. However, this type of fuel poses a serious threat. If for any reason the burner suddenly goes out and the gas supply is not turned off in time, a leak will form and this can result in serious trouble and endanger the lives of people in the room. In order to immediately shut off the gas if the flame suddenly goes out and a thermocouple is used to gas boiler.

In this article we will talk about what a thermocouple is, why it is needed and how it works, we will consider the main types and most common faults associated with these devices, as well as methods for eliminating them.

Device, principle of operation and main types

A thermocouple is a classic thermoelectric converter that is used to measure temperature in various fields of industry, science, medicine, as well as in automatic systems management and control of gas boilers, stoves and water heaters.

It is designed very simply and can easily be made independently. Two conductors from various materials connected into a ring. One of the connection points is placed in the measurement area, and the second is connected to the measuring instrument or converter device.

Photo 1: Thermocouple for the device gas control

The operating principle of a thermocouple is based on the thermoelectric effect, or as it is also called the Seebeck effect. It lies in the fact that at the junction of two conductors connected in a ring from different metals tension appears. If the temperature of the soldering points is the same, the potential difference is zero. But as soon as one of the junctions is placed in an area with a higher or lower temperature, a voltage appears that is different from zero and proportional to the temperature difference. The proportionality coefficient is different for different metals and is called the thermo-EMF coefficient.

Photo 2: Design and principle of operation of the thermocouple

The main materials for the manufacture of thermocouples are noble and base metals. Most of their alloys have rather exotic names, which are very popular among the compilers of various crosswords and scanwords. Depending on what metal pairs are used in manufacturing, thermocouples are divided into several types. Below is a table with their main types, designations and characteristics:

In automatic systems for geysers, stoves and boilers, thermocouples TCA made of chromel-alumel (type K), TCA from chromel-copel (type L), TLC made of iron and constantan (type J) are usually used. Sensors made of noble metal alloy are designed for high temperatures and are mainly used in foundries and other heavy industries.

Photo 3: Sakhalin gas burner for heating boilers and furnaces

Some models operating on solid fuel, for example, such as the solid fuel heating boiler “Lemax” Forward, can be equipped with gas burners, which use thermocouples to protect against gas leaks.

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Thermocouple in the gas control system (gas control)

If you decide to install in your country house solid fuel boiler. you don't have to worry about what will happen if the fire suddenly goes out. However, when you use gas equipment, you need non-volatile automation that can quickly shut off the gas supply if the burner suddenly goes out. For these purposes, modern gas boilers are equipped with a gas control system. How does it work?

The system consists of two main parts: a solenoid valve and a thermocouple. One end of the sensor is placed directly in the burner flame, and the second is connected to an electric valve, which consists of a core with a winding, a cap, a return spring, an armature and a rubber band that shuts off the gas supply.

Photo 4: Non-volatile gas control system for stoves and boilers

The gas control works quite simply. By pressing the gas button, you push the rod inside the coil, charging the spring. According to the instructions for igniting a gas boiler, the supply valve must be held pressed for about several tens of seconds. This time is necessary for the thermocouple to warm up and sufficient voltage to appear at its ends to hold the valve inside the coil.

At the moment when the burner goes out, the thermocouple begins to cool, the voltage at the ends of the thermocouple decreases and at some point, the return force of the spring outweighs the electromagnetic force holding the rod inside and returns the valve to its original position, cutting off the gas supply. This process usually takes several tens of seconds.

One of the features of gas control is that it is completely electrically independent. In large heating complexes, like the domestic Svetlobor pellet boiler. When the power supply is turned off, the entire control system ceases to function. The thermocouple gas control system is completely electrically independent and can operate reliably without the need to connect to an electrical outlet.

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Connection, testing and troubleshooting

One of the common malfunctions of gas boilers looks like in the following way: you press the gas supply button, light the igniter, hold it for the prescribed 30 seconds, release it and the burner immediately goes out. One of the reasons that can lead to this result is a faulty thermocouple or its poor contact with the solenoid valve.

Photo 5: Connecting and checking the thermocouple on the measuring device

You can fix this problem yourself without resorting to the services of a specialist. To do this you need to follow these steps:

1. Using a wrench, unscrew the clamping nut that holds the thermocouple in contact with the solenoid valve and remove its end.
2. We inspect the connector for the presence of various oxides and contaminants. If necessary, use fine sandpaper to carefully clean the contact area.
3. Next, you should check the thermocouple with a multimeter. To do this, we connect one end to the measuring device, and heat the other with a manual gas burner. The voltage at the ends of a working thermocouple should be about 50 mV.
4. If all indicators are normal, you should put everything back together and try to start the boiler.

If the problem remains, most likely the solenoid valve itself is faulty or the contact between it and the thermocouple is still poor. If the valve is in good condition, you should re-clean the connection and try to find a position of the clamping nut at which good contact is achieved.

Useful: To connect thermocouples to measuring instruments Compensation wire is usually used. In this cable, the cores are made of the same material as the sensor itself. This can significantly reduce measurement error.

If the thermocouple fails, you need to buy a new one. On Russian market There are many different manufacturers producing these sensors: Arbat, AKGV, AOGV (Zhukovsky plant), Honeywell. Prices different types are in the region of 600 - 2000 rubles.

For more information on how to repair a thermocouple in a gas boiler yourself at home, see the following video:

Return to contents Conclusion

Thermocouples are actively used not only in the automation of gas stoves, boilers and water heaters. Based on them, many different thermostats and thermometers have been produced, both for household and industrial purposes. Many craftsmen at the base thermoelectric converter They make their own chargers and mini power stations that can charge phones and other low-power devices directly from a fire or other open flame. We hope you liked our story, and you learned a little more about the nuances of the operation of such familiar household appliances.

Thermocouple for a gas boiler: principle of operation, characteristics, troubleshooting

An article about the design of a thermocouple, operating principle, main types and characteristics, do-it-yourself fault detection and repair, as well as its role in the gas control system of a gas boiler.

Source: kotlydlyadoma.ru

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How should you check valves and other components on a gas boiler?

Each gas boiler needs several key components that will monitor the unit for its proper operation. In case of any deviations, various components are triggered and the installation simply stops functioning. But at the same time, you need to understand how to check the solenoid valve of a gas boiler, thermocouple or any other component. After all, knowing about the malfunction, in most cases you can remove it yourself.

This device is one of the few that can measure high temperature. It is both simple and yet reliable. The thermocouple is made of two conductors from various metal, which connect to different points. All this makes it possible to use it in for different purposes. The main disadvantage is the error of one degree. To ordinary people this seems insignificant. But for such devices, many consider such indicators to be simply gigantic.

The device is used as a fuse. It measures the temperature in the heating pad. If it starts to fall quickly (say, for some reason the fire goes out or there are problems with the chimney), the system is triggered, which sends a signal to the solenoid valve and the gas supply stops. Therefore, if this component does not work, the equipment is inoperative.

Sequence of actions for checking:

1. The thermocouple has two ends, the first of which is heated by the igniter, and the second is attached to the solenoid valve. It is necessary to separate the device from the boiler, be it a regular one or a condensing one with a three-way valve.
2. Then provide a constant flame. A candle is best.
3. Heat the tip above the flame at a distance of 1 cm. Just be careful, as the heat can reach half of the body.
4. We take the tester and turn it on to millivolts. One probe is placed on the body, and the second on the output contact.
5. After half a minute, a working thermocouple will show the EMF in the range from 17 to 25 mV. If the indicators are normal, then the problem of a non-working system may be elsewhere.

Solenoid valve

The solenoid valve is a shut-off valve that directly affects the safety of the unit. It is mainly installed so that in the event of a problem, it closes the fuel supply. Emergency situations at work gas heating may occur due to various factors:

• drop in fuel pressure;
• lack of fluid in the system (you can check the joints, three-way valve and pipes);
• worsening traction;
• gas leak.

Each of the above problems is dangerous to human life, and therefore further work system is unacceptable. This is why the solenoid valve is activated. Its initial position is open. To close it is applied electrical impulse, coming from a thermocouple installed above the flame in the combustion chamber or on the chimney.

It must be said right away that this element rarely fails, since it has great potential for use. Despite this, moments still happen.

There are two ways to check the functionality of this valve:

1. Fire. The used thermocouple is replaced with a new one. The automatic button turns on. Next, the igniter is ignited and the fire is brought to the end of the thermocouple. In this case, the automation should work.
2. Instrumental. The sensor is removed from the housing and a repair contact is inserted. It is supplied with voltage from 3 to 6V. If the solenoid valve is in order, the automation will work. Otherwise, you need to replace this element.

Ignition transformer

This element supplies the burner with a current discharge (spark), which is necessary to ignite the fuel. In addition to other elements that directly affect the operation of the unit, the component can also fail. As a result, all automation will work, but fire will not appear, since there is no source of ignition.

How can you quickly check the ignition transformer of a gas boiler for functionality? Just. You need to make a few simple movements:

1. Through a special window, see whether the discharge is going on or not.
2. Using a tester, check the voltage coming out of the controller during the ignition attempt. A figure falling within the range from 187 to 235V is considered normal.
3. If a problem is detected, you need to disconnect the power from the transformer and connect it back.
4. Check again.

Any gas boiler is equipped with many safety elements and sensors that allow you to monitor proper work unit. In the event of situations that clearly threaten human life, the system completely shuts down the installation.

How should you check valves and other components on a gas boiler?

Article on the topic: “How should I check valves and other components on a gas boiler?” — encyclopedia of heating ZnatokTepla.ru 4.4. Flow regulators, flow switch 4.5. Rotameters, diaphragms and nozzles 4.6. Add. equipment and fittings

4.6.1. Actuators and drives 4.6.2. Control valves
• 4.6.3. Solenoid valves

5. Level 6. Automation and secondary devices 7. Analytics

Group of companies (GK) "Teplopribor" (Teplopribory, Prompribor, Heat control, etc.)- these are instruments and automation for measuring, monitoring and regulating the parameters of technological processes (flow metering, heat control, heat metering, control of pressure, level, properties and concentration, etc.).

At the manufacturer's price, products are shipped as own production, as well as our partners - leading factories - manufacturers of instrumentation and control equipment, control equipment, systems and equipment for controlling technological processes - process control systems (much is available in stock or can be manufactured and shipped in the shortest possible time).

Gas electromagnetic valves KGEO, KGEZ

Two-way shut-off electromagnetic gas valves KGEO and KGEZ(normally open NO and normally closed NC) are intended for distribution and cutoff of flow in remote automatic control systems of gas burners, boiler houses, domestic heating installations and technological pipeline systems flow control with diameter conditional passage(DN) from 10 to 100 mm of natural, liquefied gas, as well as other gases and air that do not contain mechanical impurities, as a shut-off and control device - blocks the flow of energy in the event of an emergency.

Shut-off valves KGEZ are included in the delivery set of the AMKO-1 boiler operation control system.

Versions:

— Valve KGEZ (KG-EZ) electromagnetic gas “normally closed”, NC (NC), in the absence of voltage the gas is shut off;
— Valve KGEO (KG-EO) electromagnetic gas “normally open”, BUT (no), the gas is shut off when voltage is applied.

Normally used as an emergency closed valves KGEZ.

Technical characteristics of gas electromagnetic valves KGEO and KGEZ

Electromagnetic gas valves KGEO normally open and KGEZ normally closed are two-way without unloading or with unloading of the valve using a bypass hole. The valves are equipped with forced electromagnetic drive- two-winding when powered by alternating current 220 V and single-winding when powered by direct current 24 V or 2.4 V.

Working environment of KGEO and KGEZ electromagnetic valves:

- air;
- natural and domestic gases(GOST 5542-87);
— liquefied gas (GOST 20448-90);
— other gases that do not contain mechanical impurities.

Operating conditions for KGEO, KGEZ electromagnetic valves:

— working environment temperature Трс from -30 to +50С;
- temperature environmentТos from -15 to +60С;
— relative air humidity at 35C 95%;
— KGEO and KGEZ valves are manufactured in climatic version U3 in accordance with GOST 15150-69.

Valves KGEO, KGEZ shut-off valves are designed for operation in enclosed spaces of a permanent type, explosion-proof and free of aggressive substances in the air, without sudden temperature fluctuations, protected from splashes.

Parameter (characteristic) KGEO, KGEZ	Parameter (characteristic) value
Du, mm	10, 20, 50, 65, 80, 100
Working medium pressure range, kPa	0…100*
Opening time, no more, s	1
Closing time, no more, s	1
Switching frequency, no more, cycle/hour	1000
Operating mode (PV, %)	100
Pipeline (process) connection	coupling or flange with or without flow regulator, depending on the design
Position (installation) of the valve on the pipeline	vertical with deviation from vertical ±15°
Degree of dust and water protection of the electrical part of the valves	IP65
Valve seal tightness when closed	class A according to GOST 9544-93 over the entire operating pressure range

*- up to 10 kPa for KGEZ-20 (DN 20 mm) with a supply voltage of 2.4 V.

The principle of operation of the device is based on the appearance in a closed magnetic system consisting of a solenoid coil, a magnetic circuit and an armature under the influence of electric current magnetomotive force (MFF) driving the armature.

Model range and electrical characteristics of the electromagnet of KGEO, KGEZ gas electromagnetic valves

KGEO-10-100-220-M, KGEO-10-100-24-M, KGEZ-10-100-220-M and KGEZ-10-100-24-M

Parameter name
	KGEO ~220 V	KGEZ ~220 V	KGEO =24 V	KGEZ =24 V
	220+10%, −15%		24±25%
Network frequency, Hz	50±5		-
	700±35		5.5±1
	3.7±0.4		-
	90		70
	11		7
	40		65

KGEO-20-100-220-M, KGEO-20-100-24-M, KGEZ-20-100-220-M, KGEZ-20-100-24-M and KGEZ-20-10-2,4- M

Parameter name	Valve type and supply voltage
	KGEO ~220 V	KGEZ ~220 V	KGEO =24 V	KGEZ =24 V	KGEZ =2.4 V
Mains voltage (rms value), V	220+10, −15%		24±25%		2.4±15%
Network frequency, Hz	50±5	50±5	-
Resistance of the starting section of the electromagnet, Ohm	700±35		4.4±1		1±0.2
Resistance of the holding section of the electromagnet, kOhm	2.9±0.4	3.5±0.4	-
Average active power when turned on, no more, W	120	115	50		4
Average active power during holding, no more, W	14	12	5		0,3
	75	70	95		12

KGE3-50-100-220-M(F), KGE3-50-100-24-M(F), KGE3-65-100-220-M(F) and KGE3-65-100-24-M(F )

Parameter name	Valve type and supply voltage
	KGEZ-50 ~220 V	KGEZ-65 ~220 V	KGEZ-50 =24 V	KGEZ-65 =24 V
	220+10%, −15%		24±25%
Resistance of the starting section of the electromagnet, Ohm	500±35		4.4±1
Resistance of the holding section of the electromagnet, kOhm	2.0±0.4		-
Average active power when turned on, no more, W	130		120
Average active power during holding, no more, W	20		10
Electromagnet performance characteristics
The force developed when switching on the magnetic system of the valve at a minimum supply voltage, not less than, N	240		200

KGE3-100-100-220-F, KGE3-100-100-24-F, KGE3-80-100-220-F and KGE3-80-100-24-F

Parameter name	Valve type KG-EZ, KG-EO and supply voltage
	KGEZ-80 ~220 V	KGEZ-100 ~220 V	KGEZ-80 =24 V	KGEZ-100 =24 V
Mains voltage direct current, IN	220+10%, −15%		24±25%
Resistance of the starting section of the electromagnet, Ohm	240±15		2.3±0.6
Resistance of the holding section of the electromagnet, kOhm	1.1±0.2		-
Average active power when turned on, no more, W	280		250
Average active power during holding, no more, W	40		20
Electromagnet performance characteristics
The force developed when switching on the magnetic system at a minimum supply voltage, not less than, N	530		430

Overall, installation and connecting dimensions of gas electromagnetic valves KGEO, KGEZ

Valves KG-EZ, KG-EO consist of the following main components and parts: a cable input, an electromagnet, a housing, a nut and an armature with a locking device inside the device, and if there is a flow adjustment, an adjusting bolt is added.

Form for recording the designation when ordering KGEO, KGEZ gas electromagnetic valves

An example of recording and decoding the code (cipher) designation of KGEO, KGEZ gas electromagnetic valves

Valve KGEZ-65-220-M TU 3712-040-00225555-2004— gas electromagnetic valve normally closed with a coupling connection to a pipeline with a nominal diameter of DN 65 mm, powered by alternating current voltage 220 V, without adjustment.

Possible errors when placing an order for gas electromagnetic valves KGEO, KGEZ

When ordering gas solenoid valves KGEO and KGEZ (KG-EO, KG-EZ), we recommend that you be careful when placing your order, incl. consider possible options designation records and errors encountered when ordering. For example, we have encountered the following errors in applications:
- incorrect or incorrect name of the device: control shut-off valve, high combustion, low combustion, EGC, 2-way shut-off valve, 2/2 way EM valve, solenoid stop valve BUT, ZO, n.z, n.o, N3, N0, gas regulator flow, emergency safety solenoid valve for gas, locking, regulating, regulating, regulating, etc.
- incorrect model designations and spelling errors: valve KG-EO, valve KG-EZ, KGEZ, KGEO (letter “E” instead of “E” - electromagnetic), KGE-O, KGE-Z, KEGZ, KEO, KEZ, etc. P.
- spelling errors associated with translation, transliteration or keyboard layout, for example: gas solenoid valve KGEO, electromagnetic valve KGEZ, stop valve KG-EO, KG-EZ, klapany kgeho, kgehz ehlektromagnitnye, RU»J, RU»P (in En- layout) etc. and so on.

Therefore, we kindly request you to be careful when placing an order for shut-off valves KGEO, KGEZ, do not confuse the designations, and if you do not know or are not sure, then simply write the main specifications(nominal diameter, supply voltage, connection method, presence of a flow regulator, etc.), the need to purchase additional equipment in a simple form of presentation, and the engineers of our company will select the device and additional equipment you need at the best price-quality-production time ratio (availability in warehouse).

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GC Teplopribor - production and sale of instrumentation and automation equipment: Consumption / Optional equipment and fittings / Electromagnetic valves / KGEO, KGEZ electromagnetic valves (gas shut-off valves).
See tech. description/characteristics, price list (wholesale price), recommendations for selection, analogues and replacements, order form (how to choose, order and buy correctly) gas valves KGEO, KGEZ at manufacturer's price; check availability at the warehouse in Moscow (or check the production time).
Also see delivery methods and shipment by TK (Business Lines and others) throughout the Russian Federation. For other ordering information, see the official website of Teplopribor Group of Companies, section Flow/Additional equipment and fittings.

We will be glad if the above information was useful to you, and we also thank you in advance for contacting any of the representative offices of the Teplopribor group of companies (three Teplopribor, Teplokontrol, Prompribor and other enterprises) and promise to make every effort to justify your trust.

A gas valve is a type of pipeline fitting that performs a function such as regulating the working environment, as well as distributing and shutting off the flow of a gas pipeline.

Without this equipment, a person would have a very difficult time working with pipelines that transport gases, oil and other similar substances.

Basic information, characteristics and operating principle

The design of the gas valve must comply with GOST of the Russian Federation 32028, according to which the design is as follows.

The main working element of the valve is the seat, this is a passage hole located in the middle of the body through which the flow of the working medium moves, as well as a shut-off mechanism. Depending on the characteristics of a particular model, the shutter can be made in the form of a piston or in the form of a disk.

The principle of operation of the device is extremely simple: a person, by acting on the control lever (or on the electric drive, in the case of an automated design), sets the shutter into a reciprocating motion, as a result of which it blocks the passage hole, which blocks the gas supply.

This principle of operation determines the wide range of applications of gas valves: they are used both in various areas of industry, on gas pipelines and factories, and in household use– installed on gas heaters, convectors, kitchen stoves, used for gas boiler, etc.

Of course, specialized professional devices and valves for domestic use are extremely different from each other, not only in design features, but also in the price at which they can be purchased.

So, check valve for a gas water heater you can buy for about 40 dollars, but a high-quality shut-off device for a gas pipeline costs no less than 300 dollars.

Types and differences

The main classification by which the devices currently available on the market of control valves, including those for gas boilers, are divided is the number of inputs. The following groups are distinguished:

• Two-way valves: these are designs with two openings - inlet and outlet. Such devices are used exclusively to block the supply or open the flow of the working fluid of the pipeline.
• Three-way mechanisms are equipped with one inlet and two outlet holes. This design allows the device to perform not only a shut-off and control function, but also a redirection function.
• Four-way gas valve - has 4 holes, of which 3 are outlet, and one is inlet. They are essentially identical in functionality to three-way valves, however, the presence of an additional outlet somewhat expands their operating potential and the area where a four-way valve can be used.

A division is also made according to the type of valve control; depending on this, two categories are distinguished:

• Valves with manually controlled locking element. This simple mechanisms, the shutter of which is driven by turning the control wheel or lever. The main distinguishing quality of devices of this type is their fairly high reliability and the low price at which they can be purchased.
• Solenoid valves. Availability electric drive makes it possible to control the shutter in automatic mode. Such devices are mainly used in industrial gas pipelines, heating networks, and production lines– that is, in places where simultaneous control of a large number of control devices is required.

In addition, electromagnetic gas valves, depending on the position of the shutter that it takes in the event of a power outage, can be divided into three main groups:

1. Normally open structures. Such devices move to the open position when the power is turned off, thereby guaranteeing free circulation of the working environment in the pipeline.
2. Normally closed. Without power supply, the shutter accepts closed position and blocks the gas flow in the system.
3. Universal valves. Such valves, in a situation where the power supply is interrupted, remain in the position in which they were before.

Also, depending on the functional purpose, there are two more types of gas valves.

For example, a gas check valve: devices of this type perform the function of protecting the pipeline from the movement of the working medium in the opposite direction. Design features a mechanism where a check valve is activated allows flow to pass only in a strictly specified direction. This is its operating principle.

Pipeline protection will be the main purpose of a mechanism such as a check valve. These valves are usually installed directly next to gas equipment: storage tanks, transfer pumps, dispensers, gas boilers and reducers, since the non-return valve thus prevents the movement of flame in their direction.

The gas safety valve performs functions similar to those assigned to the non-return valve. These are special protective devices that prevent emergency situation due to sharp changes pressure in the gas transportation system, including the presence of a gas boiler.

These valves automatically shut off the gas supply when the pressure of the working medium exceeds or falls below a predetermined limit.

The design provides for the release of a volume of gas creating excess pressure into the atmosphere, after which the valve closes and the pipeline continues to operate in normal operating mode.

It is worth mentioning that this type of pipeline fittings can be significantly modified.

Thus, a high-price safety shut-off valve is usually equipped with a thermostat, an air pollution meter, a working fluid pressure sensor, and a mechanism for adjusting gas flow. The design features of the mechanism, whether it is a regular or check valve, depend on its intended purpose.

Review of products from popular manufacturers and models

Now let's look at the products of the most popular companies that produce such products.

Dungs

Dungs - German company, which is one of the most popular manufacturers of gas control valves.

Dungs products have been on the Russian market since 1999, and for more than 15 years they have gained fame as high-quality and reliable devices with a long service life and excellent technical characteristics.

The only disadvantage that can be noted in today's realities, as a result of comparing Dungs valves and products from Chinese manufacturers that have flooded the market, is the price. The equipment produced by Dungs is much more expensive, however, its quality is incomparably higher.

The most technologically advanced development of the Dungs company in the mass segment is the Dungs DMV-D valve - this is a two-way device, which, in fact, is a connection of two independent valves in one compact body.

The technical characteristics of the valve allow it to work with very high pressure working environment, reaching up to 500 mBar, while the energy efficiency of this design from Dungs is beyond praise.

The price at which you can buy equipment from the DMV-D line starts from $250 and ends around five thousand, depending on the size and design features of the product.

Valve adjustment (video)

Sit Group

SIT Italian manufacturer, which began its work in 1953 and since then has firmly held a leading position in the gas equipment market to this day.

Today, the Sit valve is the most popular control valve in the middle price segment. The company's products have received universal recognition due to the optimal price-quality ratio that the company's engineers managed to achieve.

Now let's look at the most popular devices under the Sit brand.

The Sit 845 Sigma valve is rightfully the most popular and sought-after device that can be purchased in the budget price category.

The 845 Sigma gas valve has a two-way design that can be installed on gas-consuming appliances from most common manufacturers; it is also suitable for a gas boiler.

This 845 valve is equipped with an electric drive, so 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 845 Sigma are the minimum period of valve activation and compact design dimensions.

This model allows you to adjust the limit level of gas pressure at the outlet. Installation of the device on the pipeline is carried out using flange connection. The valve for the Sit 845 Sigma gas boiler in size 34” can be purchased for $60.

Valve Sit 820 Nova – best option for gas consuming devices whose power does not exceed 60 kW.

It is produced in an electric drive version without a power modulator, while there is the possibility of automatic adjustment, for which a constant source of energy is required.

The maximum pressure limit at the valve inlet should not exceed 60 mBar.

Optimal ambient temperature for normal operation from 0 to +70 degrees (designed for installation inside heated rooms). The Sit 820 Nova valve can be purchased for between $55 and $130, depending on the size.

Such a valve is a technically advanced device, equipped, in addition to an electric drive, with a thermostat, as, for example, in the 630 Eurosit gas valve. This mechanism is intended for domestic use; it can be installed on geysers, convectors, water heaters, be included in the equipment set for a gas boiler, etc.

As an example, consider the 630 Eurosit valve. Adjustment of the gas valve 630 Eurosit is carried out using a special wheel, which has three operating modes: “MS” (temperature selection), “ignition”, and “off”. The 630 Eurosit valve also has a setting maximum flow gas, which is a feature of the 630 Eurosit valve.

The thermostat, equipped with a special modulation system, prevents any malfunctions in the operation of the 630 Eurosit valve, and if the permissible operating temperature is exceeded, it completely shuts off the gas supply to the main burner.

The 630 Eurosit valve is installed using threaded connections. The design features of the valve allow it to operate with an inlet gas pressure of 50 mBar.

In this case, the permissible operating temperature of the external environment is from 0 to 80 degrees. The 630 Eurosit valve can be purchased for $50, assuming a 34-inch piece.

Household heating appliances operating on liquefied or natural gas, do not require constant attention and control from the owners. This task is performed by automation for gas heating boilers.

Electronic and mechanical control units integrated into the heat generator regulate combustion and help maintain the required temperature in the coolant.

The automation works properly, accurately and reliably, increases the efficiency of heating equipment, promotes reasonable consumption of energy resources and makes the operation of the heating system simple, comfortable and absolutely safe.

The automatic system protects heating installations from overloads and activates emergency shutdown gas supply in case of sudden force majeure circumstances. Additionally, the equipment regulates the level of combustion intensity and current fuel consumption, allowing owners to save financial resources for space heating.

The automatic unit has flexible settings and allows the owner to set the most convenient operating parameters for the equipment.

According to the basic operating principle and design features automation for gas-powered equipment is divided into:

• energy dependent devices;
• energy-independent devices.

Systems of the first type are complex electronic units that require an uninterrupted electrical supply to operate correctly. The second types of devices are simplified mechanical structures that do not require energy supply.

Type #1 - volatile products

Volatile module is a small electronic device that responds to the supply of fuel. Turns on and off when the main one is activated or closed gas tap. It has a complex design and a large number of elements and microcircuits.

Allows owners to solve the following tasks:

• activation or termination of gas supply;
• starting the heating system in automatic mode;
• adjusting the power level of the base burner (due to the presence of a thermostat);
• turning off a running boiler both in emergency situations and within a user-specified mode;
• displaying current indicators on the display (the general level of air temperature in the room, the point to which the working coolant has been heated, etc.).

More sophisticated modules have additional functionality and offer users unlimited and most convenient conditions for monitoring the operation and control of the unit. Electronic panels provide complete protection of heating equipment from malfunctions and prevent the boiler from freezing.

If the temperature in the room drops sharply, the “smart” system itself starts the heating equipment and turns it off when the home is filled with comfortable warm air.

Self-diagnosis option available with individual modules, prevents operational failures and contributes to the timely identification of faulty parts and assemblies in the system. It makes it possible to notice a breakdown as early as possible and replace some small element even before it creates a real problem for the equipment.

Minor breakdowns of the heating system eventually turn into global complications and entail costs associated with the repair and dismantling (full or partial) of the equipment. Self-diagnosis helps to identify a malfunction and makes it possible to eliminate it in a timely manner.

Electronic automation responsible for safe operation equipment, ensures uninterrupted operation of the boiler, prevents the system from overheating and shuts off the gas supply in the event of a drop in draft or extinguishment of the flame in the burner.

The range of energy-dependent automation on the market today is pleasingly diverse. Useful and necessary mini-units are produced by world-famous brands and small companies that are just trying to earn their place in the sun.

Volatile automation is presented in the form of a control panel, where the user can set convenient operating parameters for the equipment. The cost of a “smart” element is high, but the costs are justified, because with the help of a control unit you can reduce resource consumption without any damage to your own comfort

Among the models offered there are both very simple products and more advanced units with a programming option.

On them, the user can choose the ones most suitable for himself and program the system to operate in day/night mode or, based on the weather forecast, set a certain level of heating of the house or apartment for a period of 1 to 7 days.

Type #2 - non-volatile units

Non-volatile automation more simple and practical. Control and adjustment are carried out manually using mechanical rotary toggle switches and are not difficult even for those who are far from technology. The device operates completely autonomously and does not need to be connected to a central electrical system.

To heat a residential building and supply hot water to the taps, it is enough to turn the control knob in the direction of increase by 2-3 divisions. If you need to take a bath or shower, the toggle switch must be set to the maximum setting

The product is marked with a digital scale with a list of values ​​from minimum to maximum. To activate, the user selects the desired mark and in this way sets the appropriate operating temperature directly to the boiler.

After these manipulations, it connects and takes control of the specified heating mode. The boiler actively works until the room warms up to the desired temperature. Then the thermostat turns off the gas supply to the system and is activated again only when the room gets colder.

The operating principle is based on the specific design of the device. The gas boiler thermocouple built into the heat exchanger is equipped with a special rod. It is made from a special iron-nickel alloy called invar.

The physical characteristics of this advanced material give it the ability to almost instantly capture minimal temperature fluctuations.

If the room becomes too hot or too cold, the size of the rod changes. The connecting valve reacts to this and promptly shuts off or activates the flow of gas to the burner.

The presence of a non-volatile automatic control system allows users to set the most suitable temperature regime in their house or apartment and use fuel economically without overpaying on utility bills

Additionally, non-volatile type automation has sensitive ones. If the pressure in the pipe suddenly decreases or the draft level in the chimney drops for some reason, the supply of the resource is immediately stopped and gas leakage can be avoided.

Non-volatile automation costs quite reasonable money and, unlike electronic analogues, does not require the purchase and installation of a stabilizer that controls voltage and equalizes unexpected surges in the central power grid

Correct operation of the flame sensor is ensured by a special plate. During normal and correct operation of the system, it is in a slightly curved state.

In this way, the part holds the shutoff valve in the “ Open" When the flame becomes smaller, the plate is leveled and the valve closes under its pressure.

Design and operating principle

The automation that controls the work consists of many elements, conditionally divided into two subgroups. The first includes mechanisms that ensure the full and safe functioning of the boiler itself. The second includes devices that make it possible to operate the heating system in the most convenient and user-friendly mode.

Components of a security system

Several modules are responsible for the operational safety of the unit:

1. Flame controller– consists of two main parts – a solenoid valve and a thermocouple. Shuts off gas promptly and reliably and prevents leakage.
2. Thermostat– maintains the set coolant temperature and protects the system from overheating. When the coolant cools down to minimum temperatures, the module starts the boiler into operation, and after recording peak-high indicators, turns it off, completely relieving the owners of the need to constantly pay attention to the system.
3. Traction control sensor, is responsible for stopping the gas supply to the burner in the event of a change in the basic position of the bimetallic plate, thus preventing gas leakage.
4. Safety valve– monitors the amount of coolant in the circuit.

In addition to all the above useful qualities, the automation has a number of additional functions that increase the comfort of using the equipment.

The device performs auto-ignition gas burner, selects the most effective operating mode, promotes rational consumption of energy resources and conducts independent diagnostics, saving owners from all these activities.

Operating principle of security automation

Current normative documents says that the safety complex of gas boilers must be equipped with a device that stops the operation of the entire system and cuts off the gas supply in the event of an unexpected breakdown or any other force majeure circumstances.

To carry out this task, automation must keep under control such parameters as:

• gas pressure in the system;
• presence of an optimal size flame in the burner;
• full, high-quality traction;
• working coolant temperature level.

When the gas pressure in a non-volatile mechanical system drops to a critical level, the resource supply immediately stops. This happens automatically due to the presence of a valve mechanism set to a certain value.

Volatile electronic devices are designed slightly differently. In them, the above function is performed by a minimum/maximum pressure switch.

As the number of atmospheres increases, the membrane with the rod bends, opening the power contacts of the boiler itself. Gas stops flowing and is not supplied until the pressure level is restored.

It is prohibited by law to independently troubleshoot problems and somehow interfere with the basic functionality of the equipment. Only a qualified specialist - an employee of the gas supply company - can correct any problems that arise.

If the flame disappears in the burner, the thermocouple cools down and stops producing current. After this, the electromagnetic damper in the valve no longer functions and gas stops flowing to the burner. When the thrust drops, the bimetallic plate heats up intensely, changes shape and acts on the valve, causing it to stop supplying fuel.

The coolant temperature is kept under control by a thermostat. It ensures that the user-selected heating mode is maintained, while preventing the system from overheating and failing.

Nuances of the system's functioning

Volatile electronic automation operates based on information received from sensors. The microprocessor and internal controller analyze this data, process it and provide the system with commands that are optimally suited for a particular situation.

In order for electronic automation to function normally for a long time, it is necessary to call a technician annually to inspect the equipment, diagnose the microprocessor and view memory module reports

Mechanics have a slightly different principle. When the boiler is turned off, the internal gas valve is completely closed. At the moment the equipment is started, the washer on the valve is squeezed out and the passage for the fuel resource to the igniter is forced to open. Ignition stimulates heating of the thermocouple and voltage is generated across it.

This resource uses an electromagnet to support the valve in open position. By turning the washer manually, the user can effortlessly adjust the level and power of his heating equipment.

Review of popular models and manufacturers

The market for progressive gas equipment and related elements includes both domestic and foreign manufacturers. According to the principle of operation, all devices are absolutely identical, but in terms of design there are significant differences between them.

The presence of automatic control in the gas heating system makes it possible to comfortably heat the room and rationally use energy resources. With a reasonable approach, savings can range from 30 to 43%

The cost of modules varies over a wide range. Simple mechanical products with a minimum of functions belong to the budget class and are sold at the lowest price. Advanced electronic panels are valued much higher, but provide the user with more extensive options for individual settings and control of operation.

Some devices, such as SABC automation, in addition to basic functions, are equipped with a built-in pressure stabilizer. This allows for more precise adjustment of the operation of gas equipment

Programmable electronic devices are considered luxury. They enable the owner to set an operating plan for the equipment for a long period of time, taking into account seasonal weather conditions and the current outside air temperature.

No. 1 - automatic EUROSIT 630

Automatic non-volatile unit EUROSIT 630 produced by an Italian company Sit Group (Eurosit) In terms of sales, it occupies a leading position in the market.

It is considered universal and works effectively with parapets and power from 7 to 24 kW. Switching on/off, igniting the pilot burner and setting the desired temperature are carried out using one handle with a button.

The Eurosit 630 module is a modern unit for controlling gas equipment. Fully complies with international standards and safety requirements for such devices. Has a European quality certificate and a guarantee from the manufacturer

The product is different high level reliability, withstands significant operating loads and has extensive functionality. The structural elements are “hidden” in the housing, to which sensor cables and other connecting tubes are routed.

The ignition time of the heating boiler using the Eurosit 630 automatic system is 10 seconds. Gas is immediately supplied to the system and very soon the room warms up to the set temperature

Inside the unit there is a cut-off device, spring valve and pressure regulator. The gas supply is carried out from below or from the side according to the user’s wishes. In terms of cost, the unit is included in the budget category.

No. 2 - Honeywell 5474 module

The Honeywell 5474 device is manufactured by a German concern Honeywell, which has been specializing in the development and sale of various types automation. Works correctly with household power up to 32 kW.

Honeywell 5474 is a non-volatile device for controlling the heating system. Equipped with micro-flare burners made of heat-resistant of stainless steel. They provide better gas combustion and reduce emissions into the atmosphere. harmful substances and prevent excess soot from depositing in the chimney

The Honeywell 5474 automatic system is equipped with a basic set of control functions that guarantee effective work boiler with absolute safety for users.

In automatic mode, the product maintains the specified coolant temperature (from 40 to 90 degrees), turns off the boiler in the event of a fuel supply cutoff, lack of draft at the required level in the chimney, reverse draft occurs, or burner extinguishment.

No. 3 - premium automation from Honeywell

In addition to inexpensive budget models company Honeywell also produces other types of automatic equipment, for example, luxury chronothermostats of the premium ST series or programmed thermostats Honeywell YRLV430A1005/U.

The YRLV430A1005/U device, with the widest possible functionality, has a user-friendly interface and does not cause any difficulties for customers during use. The cost of the product is quite high, but still lower than that of competitors offering models with similar characteristics

These electronic panels allow you to set the heating equipment the most detailed and precise settings, up to changing the temperature several times a day depending on the time of day, weather conditions and personal wishes.

No. 4 - Orion device

Automatic device Orion manufactured in Russia. The device includes a piezoelectric ignition and a draft sensor.

The Orion device looks simple and has a minimal set of functions. Its capabilities are not too great, but, thanks to its reasonable price and basic control method, the unit is in demand

The device turns off the gas in case of random extinguishing of the burner or lack of the required draft. When the room temperature drops, the thermostat activates the fuel supply and the boiler resumes operation.

The transition to the flame reduction mode when a certain (user-specified) temperature is reached occurs automatically and allows you to save fuel resources.

Conclusions and useful video on the topic

A detailed description of the operating principle of automation designed for a gas boiler. Interesting features and nuances of monitoring equipment:

How does the automation of a gas heating boiler work? A visual demonstration of the process of igniting a gas unit:

A detailed description of one of the most popular automation models designed for controlling and adjusting a gas boiler:

Gas heating system, controlled by automation, is a practical and cost-effective option for home heating equipment.

The mechanical controller is distinguished by its low price, reliability and simple control method. An electronic panel is more expensive, but has advanced functionality that allows you to create the most in a room. comfortable conditions.

It is better to purchase mini-units in branded stores, where certified goods are sold that meet all the requirements for elements of heating systems operating on gas.

Do you know the intricacies of gas equipment automation that are not mentioned in the article? Did you have any questions while reading the material? Please write comments and share own opinion and photographs on the topic of the article.

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

Device design

Solenoid valves are also called solenoid valves because they are based on a solenoid in the form of a coil. It is enclosed in a metal case, complete with a lid and outlet openings. In addition, the working structure consists of pistons, spring block and a rod and plunger that directly control the gas solenoid valve. The design of the coil may vary depending on the type of medium and its pressure, but most often it is a winding with high-quality enamel wire in a dust-proof housing. The cores are made of electrical copper.

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

Performance properties of materials

Since it initially focuses on special conditions applications, special plastics are used for the basis of the structure. For example, EPDM polymer provides the device with resistance to chemical influences, aging and pressure changes. 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 polytetrafluoroethylene that can withstand high concentration acid mixtures. In this case, contact with aggressive gas environments and operation in temperature range from -50 to 200 °C. It is not recommended to use PTFE polymer 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. Gas shut-off valves for the same household supply networks may well be made from inexpensive elastic polymers like butadiene-nitrile with a rubber base. This material copes well with the maintenance of butane and propane mixtures, but at the same time it is afraid of strong oxidizing agents and ultraviolet radiation.

Working principle of solenoid valve

The state of the valve is influenced by an electromagnetic coil, the pulses of which activate the shut-off elements. The static position of the valve is characterized by its closedness. In this position, the locking membrane or piston element is pressed hermetically 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 pipe, the electromagnetic gas valve is additionally locked with a plunger until the voltage in the coil changes. At the moment of impact magnetic field the central channel in the solenoid begins to open, where the spring-loaded plunger is located. As the pressure balance changes on different sides of the valve, the piston group with the membrane also changes its state. The armature remains in this position until the voltage on the coil decreases.

Features of a normally open valve

The operating principle of the most common statically closed structure was described above. In the case of a normally open valve, regulation is carried out differently. In the normal position, the shut-off elements provide free passage for gas mixtures, and the supply of voltage, accordingly, leads to closure. Moreover, maintaining a long-term closed state for safety purposes is possible only with long-term and stable support of the specified voltage. An even more functional solenoid valve for a gas boiler operates not directly, but with a technological pause. Within a short period of time, the system evaluates whether other safety conditions are met in the mixture supply circuit. The coil voltage itself does not initiate valve closure. But if indirect conditions are met, then it works automatically. The decisive factor, in particular, may be a certain voltage value, the same stability or a given amplitude of pressure drops.

Types of device

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

Conclusion

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