Electromagnetic gas valves: purpose, design, types, installation. Solenoid valves for gas. Description and characteristics Device, principle of operation

Gas equipment protection systems block the flow of energy in the event of emergency situations. Operation without them gas installations prohibited. Security elements include gas valves electromagnetic type.

Solenoid gas valves

Devices of this type belong to pipeline fittings and are used to distribute the gas flow and cut it off if necessary. They are widely used in both individual gas equipment and industrial ones. The device is controlled automatically under the influence of voltage.

Electromagnetic gas valves are installed at the inlet of the gas pipeline in front of the following consumers:

• boilers;
• automotive gas equipment;
• entering a pipe into a multi-storey building.

Most gas valves are of a closed design, meaning that when there is no voltage, the valve closes the pipe.

Construction of gas solenoid valves

Solenoid type gas valves consist of electrical and mechanical parts. The electrical system is used to control the system, while the mechanical system is the actuator. The entire circuitry of the device is located in the housing. The main operating components are the so-called seat and bolt. The seat is a hole through which the gas flow passes and is closed by a valve. The latter is designed like a plate or piston. The shutter is mounted on a rod, which is part of the electromagnetic system.

The electromagnetic system consists of a coil within which a core moves. It is connected to the bolt rod. The electromagnet itself has its own plastic housing and is located outside on top of the valve body. The operation of the electromagnet is counteracted by a return spring.

Solenoid gas valves operate on the following principle. In the initial state, when there is no supply voltage at the electromagnet terminals, the return spring holds the gate in a certain position. This position often corresponds to a closed channel in the valve. As soon as power appears, under the influence of magnetic force, the shutter core is retracted, overcoming the force of the return spring, and the shutter opens the channel. Some valves are brought into operating position by manually cocking (opening) the shutter. By using the current supplied to the electromagnet, the magnitude of the magnetic flux of the electromagnet can be adjusted. In this way, the operation of the valve is controlled by not opening it completely, thereby regulating the gas flow.

Types of Gas Valves

Solenoid gas valves come in various configurations and internal structure, but they are all divided into:

• Normally closed (NC). That is, if there is no voltage, the gas is shut off. These are basically emergency type valves.
• Opened in normal condition (NO). Gas flows freely if there is no voltage on the coil, and is closed when a control signal is applied.
• Universal type. In such devices, it is possible to switch the position of the shutter, which can be either open or closed, in the absence of power to the electromagnet coil.

According to the principle of actuating the shutter, the electromagnetic gas shut-off valve can be of indirect and direct locking methods. In the first case, the electromagnet core is helped by the pressure of the working medium in the event of the shutter being activated. In the second, the shutter is moved only by the electromagnetic force acting on the rod.

Gas valves can perform not only a protective function, but also a distribution function. In this sense, there are devices for different numbers of moves:

• Two way valves. These are the most common models of safety valves, having one inlet and one outlet. Their main function is to block the channel in any possible emergency situations.
• Three way valves. Control valves provide the ability to direct the flow of gas from an inlet between two outlets.
• Four-way valves can be installed in various complex systems, where there is a need to control energy flows through three different channels.

In addition to the above features of gas valve modifications, each specific device may have original design, different from the standard. Thus, some valves have internals specially manufactured to operate in aggressive conditions.

Installation Rules

To install correctly on gas equipment solenoid valve, the following requirements must be adhered to:

• Valves are installed at the inlet of the line immediately after the gas tap and filter element.
• The arrow on the device indicates the direction of energy flow.
• The valve position is only horizontal or vertical at an angle of 90 degrees.

Conclusion

All work on installation and maintenance of gas equipment can only be performed by qualified gas service specialists. This must be taken into account, otherwise incorrect work can lead to dire consequences.

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, a spring block and a rod with a plunger, which 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 Usually a flange or threaded method of connecting to a pipeline is 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 auxiliary fittings and control and measuring 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 the temperature range from -50 to 200 ° C are allowed. 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 supply 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

In choosing the right one 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 specifications, which 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 long term services. 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.

Electromagnetic valves KEG-9720 are intended for use in systems remote control gas burner devices of steam and hot water boilers, heating units, household heating installations and in technological pipeline systems to control gas flow as a shut-off and control device and a safety device.
Scope of application of KEG-9720 valves: installation in boiler rooms operating on gas; in the residential sector utilities equipped with stoves, hot water columns, heating boilers, running on gas.
For connection to the gas pipeline, threads are made in accordance with GOST 6357-73 or flanges in accordance with GOST 12815-80.
The parts of the KEG-9720 valve are made of corrosion-resistant materials (aluminum, stainless steel). The valve seat is protected from contamination by an inlet filter.
The valve is equipped with an electrical connection system with a built-in rectifier and grounding contact.
To connect pressure sensors, control devices, pilot burner pipeline and other elements, the valve body has a pipe with a 1/4 “thread.
Working position - electromagnet up.

Main technical characteristics of the KEG-9720 valve

Design of valves KEG-9720

Note. Electromagnetic valves KEG-9720 are supplied as separate products and as part of safety systems (SGG6M, SOU-1, STG-1).

Online application

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Large selection of solenoid valves used in gas communications. The product body is made of brass, strong and durable. The products have a manual cocking function and are classified as normally closed valves (opens if the stem is cocked and electricity is connected). The manufacturing company is European.

All types of this equipment are available, with flanged and threaded connections.
The offered products remotely control gas flows, shutting them off if necessary (if the product is used in conjunction with a gas detector). Closing will take no more than one second.

Designed for industrial and domestic use.

EVGNC versions

Operating principle of the EVGNC valve

In the absence of voltage, the EVGNC valve is closed, and in the presence of voltage and the rod is cocked, it opens. When the EVGNC valve is operating, for example, with a gas alarm, after a gas leak has occurred, the alarm relay contacts close, voltage is applied to the valve, and the valve shuts off the gas supply. Closing time less than 1 second. To open the valve, cock it using the cocking rod.

Technical characteristics of the gas shut-off valve normally open with manual cocking EVGNC

Overall dimensions of the gas shut-off valve, normally closed, with manual cocking EVGNC

PRICE for EVGNC valve

An electromagnetic valve for water, gas, and oil products, which has a shut-off and control design, is actively used in modern industry. The valve allows you to remotely control heating and heating equipment, as well as gas flows in pipelines. By using a gas solenoid valve, the general security systems, with low power consumption, the equipment is highly reliable and long term service with sufficient fuel purity (no inclusions of mechanical impurities).

Main types of solenoid valves

1. Electromagnetic shut-off valve for use on pipelines through which only liquid media or gases are transmitted. This equipment operates as part of air conditioning, ventilation, oil products, gas and water vapor systems.
2. Valves with pneumatic drive.
3. Explosion-proof and spark-proof valves.
4. Devices that allow you to control pneumatic actuators
5. Valves for special purposes (solenoid solenoid valve that work with cryogenic working media, gas stations, vacuum installations).
6. Electric pneumatic distributors.

Manufacturers presented today create solenoid valves of a normally closed design. If the shutter is manually cocked, automatic closing occurs, which is triggered when a signal is received on the coil (electromagnet). All fuel solenoid valves are a tool for increasing the safety of the facility, since in the event of malfunctions and operation of the equipment, it is necessary to assemble it.

Our company is actively working on the design and development of new modifications of solenoid valves. Call, contact, we are always ready to provide detailed advice on all questions that arise.