Electromagnetic gas valve - this is one of the devices pipeline fittings, designed for distribution and regulation of the working environment in gas supply systems, as well as gas pipelines. Home distinctive feature solenoid gas valve is remote control which is carried out using electricity. An electrical impulse initiates the movement of an electromagnet in a given direction, which in turn sets the movement of the shutter.
Solenoid gas valve device
The working element of a gas solenoid valve is a seat - an opening located inside the body for the passage of the working medium, as well as a shutter. Depending on the model and configuration of the device, the shutter can be made either in the form of a plate or in the form of a piston. By making reciprocating movements, the shutter opens or shuts off the gas supply. It is installed on a magnetic rod (core), which is connected to an electromagnet. The electromagnet coil itself is installed in the upper part of the housing on the outside of the valve.
Gas solenoid valve: operating principle
The principle of operation of the solenoid gas valve is that when electricity is applied to the coil, a magnetic field is created. Under the influence of this field, the electromagnet is drawn into the coil, and thereby sets the direction of movement of the shutter.
During operation, the valve is exposed to two forces - on the one hand it is the resistance force to the return spring, and on the other hand it is the force magnetic field. The latter is regulated by force electric current– the stronger the electric current, the higher the force with which the influence of the spring is overcome. Thus, by adjusting the current supply, it is possible to regulate the degree of opening or closing of the electromagnetic gas valve, and, consequently, the supply of the working medium.
When the power supply is turned off, the valve returns to its original position, which is determined by its design.
Types of solenoid gas valves
All existing models of gas solenoid valves can be divided into three large groups:
Normally open (NO). When the normal power supply is turned off, the open gas valves are in the open position, ensuring free passage of the working medium.
- Normally closed (NC). Normally closed solenoid valves come to a closed state without the supply of electricity, thereby blocking the flow of gas in a pipeline or any system.
- Universal. The universal gas solenoid valve is designed in such a way that it can remain in either the closed or open position during a power outage.
As for other differences, here we can highlight solenoid gas valves direct and indirect action. The former assume that the valve shutter is actuated only by the movement of the core; the latter use not only the core to move the shutter, but also the force of the working environment, which allows significant savings in effort during large passes.
Electromagnetic gas valves also differ in the number of strokes. Currently there are:
Two-way valves having only an inlet and an outlet. Devices of this type are intended solely for supplying or shutting off a working medium into any system.
- Three-way valves with one inlet and two outlets. Such an electromagnetic gas valve can not only allow passage, but also redirect the gas flow in the system.
- Four-way valves are devices that have four ports - one inlet and three outlets. Like three-way valves, they can redistribute the flow of the working fluid, but unlike them they provide more opportunities for connection to various systems.
It is worth noting that within each type of electromagnetic gas valves there are many models and modifications of these devices, differing in both size and functionality. For example, in accordance with operating conditions, some valve models may have a special coating that is resistant to aggressive environments.
Where can I buy a solenoid gas valve?
Electromagnetic gas valves are devices operating on gas pipelines, and their failure can lead to the most unpleasant consequences. This is why valves must meet the most stringent requirements for their safety and reliability. This means that you need to purchase them only from a well-established manufacturer.
OJSC Penza Reinforcement Plant is an enterprise with more than half a century of history. During the operation of the plant, our devices have repeatedly proven their highest quality and unsurpassed reliability. Therefore, if you need to purchase pipeline fittings, we recommend that you pay attention to the products of PAZ OJSC, which include various models of electromagnetic gas valves.
An electromagnetic gas valve is a device that allows you to control the supply of natural gas automatically. After the valve relay turns on the supply of electricity to the coil, the armature retracts and lifts the plunger, opening the free flow of gas into the working area.
After turning off the voltage, the plunger, due to the valve spring, returns to its position and closes the channel between the inlet and outlet fittings, blocking the flow of gas. The main purpose of such a device is the distribution and regulation of gas supply in pipelines, boilers, dispensers and other devices.
Contents of the article
Purpose of the gas valve
Electromagnetic automatic gas valves are used very widely, both in everyday life and in industrial purposes. This mechanism of the “Lovato” brand, VN series, is most often used in everyday life to control the gas supply to household appliances, such as a gas boiler or water heater. Also they are installed at the input gas pipeline to cut off the fuel supply if necessary.
The “Lovato” magnetic assembly of the BH series works like a regular tap, which allows you to shut off the gas flow by pressing a button. Such automatic control devices make the use of natural gas much safer.
Installation nuances
- Solenoid valve“Lovato” series VN is installed in rooms after the gas valve. It is recommended to install a filter in front of it to avoid clogging of the valve itself.
- When installing the equipment, pay attention to the arrow on the housing. It should show the direction of gas movement.
- The gas pipeline on which the throttle is installed must be located strictly vertically or horizontally.
- On pipelines with a small diameter, valves are installed using threads, and on pipelines with a large diameter, using flanges.
The list of pipeline fittings includes a mechanism such as a solenoid valve for gas. This is a device that works for distribution and regulation in gas pipelines, boilers, geysers and other gas supply systems.
The solenoid valve for gas has one significant feature: the magnetic valve is controlled remotely by supplying an electric current.
The created magnetic pulse provokes a displacement of the electromagnet, which in turn initiates the movement of the shutter.
Purpose and features
Magnetic choke is used quite widely both in industry and in everyday life. The Lovato magnetic gas valve of the VN series is installed in everyday life, first of all, on pipelines supplying natural gas to premises (for example, dispensers).
The Lovato BH Series Solenoid Valve on any gas line essentially works like a regular tap that can shut off the gas supply at the touch of a button. In addition, the magnetic assembly increases safety of use gas equipment(boilers, water heaters, furnaces).
If a gas leak occurs, the magnetic choke can quickly block the gas supply to the room.
The Lovato BH series solenoid valve is used for gas stove or speakers, industry and automotive systems, various workshops.
In addition, the gas solenoid valve of the HBO performs an additional function of cleaning the fuel from the presence of harmful impurities in it.
Device
The Lovato BH series magnetic gas valve consists of a seat and a shutter. There are two options for its design: in the form of a plate or a piston. The type of shutter depends on the configuration and model of the valve.
The shutter can open and shut off the gas supply by performing reciprocating movements. It is installed on a core, which is connected to an electromagnet.
A magnetic mechanism is installed on the outside of the mechanism (at the top of the case).
The operating principle of the Lovato BH series gas solenoid valve is that when electric current is applied to a magnetic element, a magnetic field is formed.
The electromagnet, being under the influence of the field, begins to be drawn into the coil. This process creates the direction in which the shutter moves.
Two forces act on the electromagnetic unit during operation:
- Return spring resistance;
- A magnetic field that depends on electric current.
If a high voltage is applied, the magnetic field increases and overcomes the resistance of the spring. By adjusting the current, you can regulate the opening of the solenoid valve, which leads to control of the gas supply to the boiler, column or furnace.
When the mechanism is disconnected from power, it returns to the position determined by its design.
Types and differences
There is a main division of all models of electromagnetic valves into three groups:
- Normally open (NO). When the voltage is turned off, devices in this group remain in the open position and ensure free flow of gas.
- Normally closed (NC). Solenoid valves without electrical current are in a closed position and block the free flow of gas in the gas system.
- Universal. This type of gas valve can be in either a closed or open state when the voltage is turned off.
It is worth noting that electromagnetic gas valves can also be divided according to the principle of shutter movement:
- Direct action. This assumes that the shutter is only activated when the core moves.
- Indirect action. When the shutter moves not only under the influence of the core, but also under the influence of gas. It is beneficial to buy an electromagnetic valve for gas of this type if a large flow is expected, because it saves the effort of the system.
According to the number of moves there are:
- Two-way solenoid valves. They have only two holes: inlet and outlet. This type of device is best used when you only need to supply or shut off gas to the system.
- Three way valves. They have three holes: one inlet and two outlets. Its advantage is that it is possible to redirect the gas flow through the system.
- Four-way solenoid valves. They have four holes: one inlet and three outlets. The advantage here is not only the ability to redistribute the gas flow, but also to connect to additional systems.
Before you buy a Lovato BH series magnetic gas valve, it is worth discussing where this device will be used and what characteristics it should have.
You should pay attention to the following conditions:
- Electrical maintenance. It is best to choose models with additional manual adjustment, or intrinsically safe ones with low power.
- Pipeline pressure. Do not select a valve with a pressure rating that exceeds the pipeline pressure. This may cause damage to the mechanism.
- Environment. You should check the valve specifications and make sure that the product can be operated under existing conditions. This is relevant when the room where the mechanism will be installed is expected to high humidity, vibration, high (or vice versa - low) temperature, direct contact sun rays or any other parameters different from the norm.
- Required voltage. It is worth checking the power source for stable voltage. Uses a 220V gas solenoid valve, and if the voltage is lower, it will cause the mechanism to not be able to open and close normally. And with increased voltage, the device will overheat. This is also relevant on gas equipment of cars - then they install a 12 volt gas solenoid valve.
The price of a gas solenoid valve will vary depending on the type, size and application.
An electromagnetic valve for a gas water heater depends on the model of the water heater) will cost from $4 to $10. A Lovato magnetic gas valve for a car costs from $10 to $15.
Devices that are not used for household purposes are significantly more expensive. Let's also give a couple of examples.
A gas solenoid valve of the KGEZ type, depending on the configuration, will cost about $20-25.
BH series solenoid valve for gas gun will cost $43.
Product overview (video)
Installation nuances
The Lovato BH series solenoid valve is installed for rooms after the gas valve. It is recommended to install a filter in front of the valve.
To correctly install the mechanism, it is necessary to place the arrow on the body in the direction of the gas flow.
The column assembly must be positioned either horizontally or vertically.
The connection is made using threads (when small-diameter models are used) or using flanges for pipes with a large cross-section.
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 an emergency shutdown of the gas supply in the event of sudden force majeure circumstances. Additionally, the equipment regulates the level of combustion intensity and current fuel consumption, allowing owners to save money on heating the premises.
The automatic unit has flexible settings and allows the owner to set the most convenient operating parameters for the equipment.
Based on 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. It turns on and off when the main gas valve is activated or closed. Is different 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.
The self-diagnosis option available for individual modules prevents operational failures and facilitates 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 the safe operation of the 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 simple products, as well as 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.
For heating a residential building and supplying hot water In the taps, it is enough to turn the control knob in the direction of increasing 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:
- Flame controller– consists of two main parts – a solenoid valve and a thermocouple. Shuts off gas promptly and reliably and prevents leakage.
- 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.
- 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.
- Safety valve– monitors the amount of coolant in the circuit.
In addition to all of the above useful qualities, automation has a number additional functions, increasing 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 regulatory documentation says that the safety system for gas boilers must be equipped with a device that stops the operation of the entire system and shuts 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 configured to specific 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 maintain the valve in the 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 advanced gas equipment and related elements includes automation from 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.
Availability of control automation in the system gas heating 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 work.
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 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. Structural elements“hiding” 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.
The product maintains the specified coolant temperature in automatic mode (from 40 to 90 degrees), turns off the boiler in the event of a fuel supply cutoff or lack of draft the required level in the chimney, back draft or burner extinguishment.
No. 3 - premium automation from Honeywell
In addition to inexpensive budget models, the 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 most detailed and precise settings for heating equipment, even changing temperature regime 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 company stores that sell certified products that meet all the requirements for elements of gas-powered heating systems.
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, share your own opinions and photographs on the topic of the article.
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 gas valve design must comply with GOST 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 outlets. 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 manual control 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. The presence of an 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 necessary.
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:
- 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.
- Normally closed. Without power supply, the valve assumes a closed position and blocks the gas flow in the system.
- 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 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 check valve. These are special protective devices, preventing emergency situation due to sudden pressure changes 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.
Yes, for safety stop valve In the high price category, a thermostat, an air pollution meter, a working fluid pressure sensor, and a mechanism for adjusting gas flow are usually installed. Design features mechanism, be it 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 is a German company that 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 electrically actuated and requires constant pressure at 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. The device is installed on a pipeline using a 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 automatic adjustment, the implementation of which requires the presence of a constant source of energy.
The maximum pressure limit at the valve inlet should not exceed 60 mBar.
Optimal temperature environment 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 household use; it can be installed on geysers, convectors, water heaters to 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.
At the same time, acceptable working temperature external environment is from 0 to 80 degrees. The 630 Eurosit valve can be purchased for $50, assuming a 34-inch piece.
