How is the solenoid valve for gas arranged? Solenoid valves for gas. Description and characteristics Types of gas valves

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

Fixture design

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

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

Performance properties of materials

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

The principle of operation of the solenoid valve

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

Features of a normally open valve

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

Device Varieties

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

Conclusion

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

A locking device that is used in LPG and allows you to shut off the gas supply while parking or while the car is running on gasoline (or diesel).

HBO - gas-balloon equipment, is installed in a car and makes it possible to choose what fuel to drive on: gas or gasoline (diesel). Gasoline is getting more expensive day by day, and the number of gas stations is growing, and new modified LPG systems are appearing, the improvements of which make it possible to save money and be confident in the safety of yourself, passengers and cars.

The gas solenoid valve is also designed to purify gas from impurities using a filter, it is controlled both in manual and automatic modes (switching from gas to gasoline and vice versa).

Components of the solenoid valve:

core with gasket;

valve return spring;

valve with gasket;

coil with copper winding;

permanent magnet;

gasket and seals;

The principle of operation of the solenoid valve

In the absence of voltage, the return spring holds the shutter in a certain position (the channel is blocked). The voltage has gone, the shutter core is retracted and the shutter opens.

For the correct and satisfactory operation of the machine with LPG, we advise you to periodically undergo the necessary maintenance. inspections and replace the gas solenoid valve.

Our company offers to buy gas solenoid valves from leading manufacturers at a reasonable price in the online store (enter the names of the companies). We are confident in the quality of the products we offer.

Solenoid valve adjustment

If there is no characteristic opening click during ignition gas valves, then you need to restore the contact of the wires on the valves and replace if a malfunction is found.

With proper adjustment of the solenoid valves, gasoline should not be consumed when running on gas. If this still happens, then you need to check and restore the tightness of the gasoline valve.

If the solenoid valve is clogged (and this happens periodically, because it cleans the gas of solid impurities), tighten the valve on the gas cylinder. Disconnect the gas line from the gas valve. Unscrew the tie bolts or screws securing the filter cap, remove the cap carefully (attention to the sealing gasket!). Then remove the filter. Dismantle, dip in solvent (646, 647, etc.), blow with compressed air.

Solenoid gas valve- this is one of the devices of pipeline fittings, designed to distribute and regulate the working environment in gas supply systems, as well as on gas pipelines. Home distinctive feature solenoid gas valve is remote control which is carried out with the help of 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 both in the form of a plate and in the form of a piston. Making reciprocating movements, the shutter opens or shuts off the gas supply. It is mounted on a magnetic rod (core), which is connected to an electromagnet. The electromagnet coil itself is installed in the upper part of the body on the outside of the valve.

Gas solenoid valve: principle of operation

The principle of operation of the electromagnetic 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 subjected to two forces - on the one hand it is the force of resistance to the return spring, and on the other hand it is the force of the magnetic field. The latter is regulated by the strength of the electric current - the stronger electricity, the greater the force with which the force 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 is turned off, the valve returns to its original position, which is determined by its design.

Varieties of electromagnetic gas valves

All models of gas solenoid valves that exist today can be divided into three large groups:

Normally open (NO). When the normal electricity supply is turned off, the open gas valves are in the open position, ensuring the free passage of the working medium.

• Normally closed (NC). Normally closed solenoid valves without power supply come into a closed state, thereby shutting off 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 in the event of a power outage.

As for other differences, here we can highlight solenoid gas valves direct and indirect action. The former assume that the valve plug 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 medium, which can significantly save effort during large passages.

Solenoid gas valves also differ in the number of strokes. Currently there are:

Two-way valves with only inlet and outlet. Devices of this type are intended solely for supplying or blocking the working medium into any system.

• Three-way valves with one inlet and two outlets. Such an electromagnetic gas valve can not only pass, but also redirect the gas flow in the system.
• Four-way valves are devices that have four holes - one inlet and three outlets. Like three-way valves, they can redistribute the flow of the working medium, but unlike them, they give more possibilities to connect to various systems.

It should be noted that inside each type of electromagnetic gas valves there are many models and modifications of these devices, differing both in size and functionality. For example, in accordance with the operating conditions, some valve models may have a special coating that is resistant to aggressive media.

Where to buy a solenoid gas valve?

Solenoid gas valves are devices that operate on gas pipelines, and their failure can lead to the most backfire. That is why valves must meet the most stringent requirements for their safety and reliability. And this means that you need to purchase them only from a well-established manufacturer.

JSC "Penza Valve Plant" is an enterprise with more than half a century of history. During the operation of the plant, our devices have repeatedly proved 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, among which various models of electromagnetic gas valves are presented.

LPG equipment is increasingly found on cars. In many ways, this trend comes from the fact that fuel in the form of gas is quite cheap and helps to save a lot of money when operating a car. Gas equipment is arranged moderately difficult, so it is quite possible to deal with it if you set yourself such a goal. Do you have it? Then be sure to read a number of articles about gas equipment for cars on our resource. In particular, today's article will tell everyone about what a HBO valve is, how it is arranged and works.

Gas equipment valve device

Valve or multi-valve HBO (often called electromagnetic) - quite important element in the design of gas equipment. The importance of this node is related to the list of functions it performs, which are represented by both the filtration of the gas mixture and its locking at some points in the operation of the machine.

V standard version HBO solenoid valve consists of:

• core equipped with a gasket;
• valve return springs;
• valve directly, also having a gasket;
• copper coil;
• magnetic field source;
• gaskets and seals;
• filter element;
• corps.

The design of the gas valve is discussed in more detail in the image below. Note that, depending on the manufacturer of the HBO unit, its device and design may differ slightly from those discussed in today's article, but only slightly. So, for example, some multi-valves are additionally equipped with a high-speed valve, which is necessary to supply the motor in the event of a break in the main fuel network.

In the template version, the gas valve is located in front of the atomizer gearbox, often right in its body. In fact, a similar HBO element is a prototype of gasoline valves used in carburetor and injection systems. Of course, gas equipment is a fundamentally different way to fuel the engine, but still you can find some similarities with gasoline types of power. For example, the valves of both supply systems are switches of the motor operating modes. That is, if by switching a special toggle switch the motorist turns on gas equipment as the main power supply of the motor, then the gasoline system is turned off special valve, and vice versa.

HBO valve functions

Solenoid valves installed on gas equipment are called "multi-valves" for the reason that they perform several functions at once. To be more precise, the functional set of most nodes of this type includes:

• Possibility of refueling through a special fitting. Thus, the filling function of the valve allows filling the cylinder with fuel through it, if other methods to achieve this goal are not applicable for any reason;
• On the contrary, the possibility of emptying the cylinder through a special fitting;
• Blocking of filling and consumption channels by using a valve mechanism;
• Blocking of excessive filling of the cylinder through the use of a special cut-off with a float;
• Blocking the gas supply through the line to the motor when it stops working, which organizes the “anti-pop” function of the valve. This was especially true for the equipment of the first generations, because the slightest problems with the gas supply to the internal combustion engine were accompanied by the sounds of pops and explosions. It was the multi-valve - anti-cotton, that solved this problem first;
• Determining the level of gas in the tank, thanks to a unique magnetic system for indicating its amount;
• Filtration of gas in its liquefied state, which occurs due to the presence of a filter element in the structure of the assembly;
• Organization of additional feeding of the engine with fuel.

To date, the multivalve in its standard form with a set of the functions noted above, they are practically not used, because such a HBO system is not absolutely safe. Despite this, such a giant in the field of universal gas valves as Lovato still releases them for sale a little bit.

Valve malfunctions: diagnostics and repair

The appearance of some problems with the functioning of HBO may indicate precisely the failure of its valve. Often node breakdowns are as follows:

• Accumulation of third-party fractions in their body (dust, debris, etc.);
• Development of internal elements of the part;
• Lack of power supply to the valve;
• "Clogged" filter;
• Manufacturing defect.

There are two ways to check the gas valve of any HBO:

1. Measuring the current indicators at its outputs;
2. analysis of his work. A working valve always clicks when you turn the key in the ignition or start the engine.

Repair of a faulty node is carried out either through its complete replacement, or individual elements of the node. Fortunately, special repair kits are still sold for most multivalves. Disassembly and assembly of the assembly is very simple on an intuitive level. The main thing is to do everything carefully, so as not to damage anything with your own hands.

As you can see, even the smallest element of HBO can play a crucial role in the functioning of the entire system. We hope that the material presented above was useful for you and gave answers to your questions. Good luck on the roads!

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