1 4 inch automatic air vent. Automatic air vent for heating

Content

1. Air in the heating system - why is it bad?
2. Design and principle of operation of an automatic air vent
3. Types and markings, popular models
4. Installation in a heating system

Introduction

The presence of air in the heating system is extremely undesirable. However, he gets there one way or another. This has a very detrimental effect on the quality of operation of the heating system as a whole and reduces the service life of its individual components. In order to remove accumulated air, an automatic air vent is needed.

In this article we will talk in detail about this device, the principle of its operation, marking features and popular models, as well as how to properly install it in the heating system.

Air in the heating system - why is it bad?

It would seem that the heating system is closed, completely filled with coolant, where does the air come from? There are several ways for it to appear inside, among them there are several main ones:

• While filling with coolant

  While you fill the heating system with water or other coolant, it mixes with air. It is almost impossible to avoid this, so you have to take it for granted.

• Through poor connections

  Poor installation of the heating system or other heating device, poor quality, defective or broken shut-off valves or other elements - all this leads to air penetration inside.

• Chemical reactions

  In addition to air, other gases can accumulate inside. For example, if you use a coolant with high acidity and aluminum radiators, hydrogen will be released as a result of a chemical reaction.

Photo 1: Automatic air vent for heating systems

As you can see, there are many reasons for this phenomenon. But why is this so bad? The first thing this leads to is cavitation. It significantly accelerates the wear of equipment and leads to noise during its operation. The second reason is corrosion. It destroys the elements of the heating system and carries their particles with the coolant flow to other devices, clogging and interfering with their normal functioning. Thirdly, the presence of air reduces the actual heat transfer heating devices and leads to disruption of the pumps. It can even cause a rupture of the boiler casing.

To eliminate all these problems, an automatic air vent is used. Let's figure out how it works in the heating system and what components it consists of.

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Design and principle of operation of an automatic air vent

The design of this small device is very simple. Inside the brass body there is a polypropylene float which is connected via a rocker arm to the spool. As the body fills with air, the float moves down and opens the exhaust valve. The freed space is filled with water and the rising float closes the spool. To prevent various debris, dust and dirt, from getting inside the spool, its outlet hole is closed with a plastic cap.

Photo 2: Design of an automatic float-type air vent

There are models with a slightly different implementation of this process, but in general it is always the same: when the float is down, the valve is open and releases air; if it is raised, the spool closes and the device accumulates gas again. This cycle is repeated again and again automatically.

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Types and markings, popular models

There are several types of automatic air vents. All of them are divided into two large types: automatic and.

Depending on the diameter of the threaded connection, they are of two types: 1/2 and 3/4 inches. The first is better known by Russian markings as an automatic air vent valve Du 15, the second - Du 20.

According to the method of fastening, they are divided into classic straight and lateral. For air vents of the second type, the threaded connection is rotated 90 degrees. The air release valve may also be located on the top or side. Various modifications are produced by the manufacturer to facilitate installation in difficult places in the heating system or for mounting on the side of radiators.

Photo 3: Automatic air vent DN15 “Valtec” VT 502 with shut-off valve

Two manufacturers are best known on the domestic market: Valtec and Danfoss. Valtec supplies Russian market automatic air vent VT.502 with mounting diameter 1/2 (DN15). The model has proven itself well and is very popular among installers of autonomous heating systems in private homes. It has a brass body coated with a layer of nickel, which is designed for a maximum pressure of 10 bar and a temperature of 110 °C. The average price at which you can currently buy this model is 280 rubles.

Photo 4: Automatic air vents 1/2 "Danfoss" series "Eagle" and "Wind"

Danfoss takes second place. It produces automatic air vents in two series: “Eagle” and “Wind”. For general technical specifications, they are only slightly different appearance. The models are made in brass cases and are designed for a maximum pressure of 10 bar and a temperature of 120 °C. In addition to the standard mounting thread DN15 (1/2), Danfoss also produces automatic air vents with fastening 3/8 (DN10). Prices for these devices are also within 300 rubles.

Air locks in pipes and radiators are a typical problem in heating systems. Everyone who lives in houses with a similar type of heating is familiar with such problems. If in open system the air outlet is not limited in any way, then in a closed pipeline, in particular a centralized one, heating devices can be freed from gas using special devices - air vents

Characteristics of air vents

It is convenient to present the technical features of the device in the table.

These parameters must be selected taking into account the type of network. For individual heating the choice is unlimited for centralized systems You need to find out the pressure and temperature of your home at the housing department.

The cost of an air vent device depends on the model, manufacturer, material, connection (1/2 inch - 10-15% more expensive). The budget option can be purchased for $5, the most expensive is $15.

It is worth spending time choosing a supplier: in one store, an automatic air vent for heating Danfoss DU 15 is offered for $7.63, in another the same model is offered for $11.5.

When purchasing branded devices famous brands(Danfoss, Wind, Valtec) beware of fakes. The price range for a shut-off valve is from $1.1 to $1.8.

Prices for automatic air vents

Price catalog for automatic air vents

Most popular models

At the moment, air vents from Valtec and Danfoss are popular. Each device is characterized by certain qualities, advantages and application features.

Device	Characteristics	Price
"Valtec" - VT.502	Mounting diameter?, that is, DN 15. The model is used in private homes, that is, in autonomous systems. Nickel plated brass body. The device is designed for a pressure of 10 Bar and operation at 110 degrees.	280-300 rubles
"Danfoss"	Made from high quality brass. The devices are designed to operate with a maximum pressure of 10 bar. They can withstand temperatures of 120 degrees. There are models DN 15 and DN 10.	300-350 rubles
"Airvent"	Device category DN15. The air vent is designed to effectively remove accumulated gases from the pipeline, as well as from the air collectors equipped with internal systems heating systems of buildings and heat supply kits.	484 rubles

Types of air vents in the heating system

Based on the operating principle, ball and needle types are distinguished. automatic devices, according to design - straight, angular and radiator. Despite different areas The principle of operation of all air vents is the same.

Special float devices are very popular. This is an automatic air vent that provides side air release. The device operates at an operating pressure of 10 bar, with a maximum permissible temperature of 110 degrees. The device can work not only with water, but also with various glycol solutions in concentrations up to 25%, and the connection thread is 1/2.

All modern automatic air vents are divided into several types, differing in general design. There are three main types of such devices:

• Angular;
• Straight;
• Radiator.

Important! Regardless of certain external differences and diverse applications, general principle The actions of similar devices are the same.

Direct air vent

The most common is the first type with a straight pipe. It is indispensable at the highest points of the system, where, according to all the laws of physics, the maximum amount of gases accumulates, and manual air release in such places is often difficult.

Which is constantly under pressure, is ensured by the boiler safety group. It is usually located on the supply pipe that exits the heat generator. In addition to the pressure gauge and safety valve, this kit also includes an automatic air vent for heating, which bleeds air when the tank is filled with liquid. If the unit is installed correctly, it can be separated from the system at any time and released for maintenance using a gas vent. For boilers operating on solid fuels, a safety group is required.

You can also find an air release in. Its task is to create conditions for them to have an uninterrupted supply of water. The problem is that the pumping unit can only work with an incompressible medium. The penetration of air onto the pump impeller threatens to stop it completely. The active circulation of liquid is controlled by the gas vent.

Important! The lack of air vents in the heating can lead to the fact that air discharge will have to be done manually, which is quite difficult

Corner air vent

If the location is too inaccessible to install a simple valve (for example, the pipe is horizontal), use an angle version of the valve. Its pipe, rotated 90?, can be connected to the horizontal part. It is worth noting that the corner modification with external thread, except for the deployed pipe, is practically no different from its analogues, so these types are completely interchangeable.

Radiator automatic air vent

Sometimes an automatic angle valve is installed on radiators instead of a traditional one. It is only slightly larger than its counterpart, a little more expensive (about $2), but does not require daily human intervention. This choice is justified if gases accumulate in the battery regularly due to a chemical reaction aluminum alloy, from which the section is made, and hot water.

Although for such cases they produce a special automatic device with a diameter like a radiator plug (see photo). The device is designed specifically for aluminum and partially bimetallic radiators and has a suitable connection type.

For cast iron batteries and old-type systems, the Mayevsky tap and drain pipe are more suitable.

Corner and modern radiator air vents

In the most different systems In the case of apartment heating, situations may arise when it is necessary to urgently remove the resulting plugs from the most remote and inaccessible areas. in certain situations, it is difficult or impossible to install a valve with a simple design; the threaded pipe is positioned strictly horizontally. In such cases, a special corner is ideal. an element such as a pipe comes out from the bottom and then turns at a right angle, so it is ideal for connecting to horizontal sections.

Important! Angled air vents equipped with an external threaded connection are practically no different from standard models; only a rotated pipe is present. It is for this reason that angular ones can be used instead of straight lines.

Very often, to automatically bleed air pockets from heating systems, instead of a conventional tap, specialists install an angle valve. This is ideal especially if gases are always formed in the heating network and this happens in the radiator part itself. The basis for this is the usual chemical reaction various substances that are found in some types of water, and aluminum batteries and at fairly high temperatures. All valves equipped with angular pipes should not be installed, since there is already a special automatic water drain.

Radiator devices were originally designed to be mounted for batteries, which have threaded connections specifically for this purpose. They are mounted instead of manual valves on bimetallic and aluminum radiators, that is, where there is some contact with water. Here, installing a radiator air vent is mandatory. In all other cases, such a device is installed strictly at will, which many people have, as it provides convenience during use.

Important! Standard radiators made of cast iron, which are connected to standard centralized heating systems. In these cases, it is better to equip the equipment with a conventional manual tap and it is necessary to combine all this with a drain pipe

Accessories for automatic air vents

For convenient maintenance, complete devices are also sold. The automatic air vent with valve is a threaded adapter with a spring-loaded reed valve. It is screwed in front of the gas outlet so that it can be serviced while the network is running. Models from VALTEK, DANFOSS and other reputable brands are equipped with such adapters.

This video will help you understand the features of each type of drainage system:

Where are air vents installed?

IN closed system When installing a device for effective gas removal, certain rules must be followed:

• The pipes are laid so that the vectors of movement of water and air coincide, and the hot liquid is directed from the main riser to distant ones.
• The air collector must be mounted at the highest point, for example, when going around a doorway from above, since air is released from the liquid at low water speed.
• Devices for removing air should be placed in areas where gas accumulation is guaranteed: at turns of risers, in places where pipes change to another cross-sectional size, on all batteries, separators, and combs.

It is mandatory that air vents are mounted on aluminum radiators, which release hydrogen upon contact with the coolant. For partially bimetallic batteries, the problem is not so urgent, but they do contain aluminum, which means that gas will have to be removed, although not so often. There is no aluminum in 100% bimetallic models, but manufacturers strongly recommend using them together with devices for bleeding air.

With steel panel batteries, due to their special design, the air release valve is installed at the factory.

Modern air vents are not effective on traditional cast iron batteries and pipes. Bleeding gases in such structures is possible only with part of the coolant, so standard and ball valve options are used. A specialist’s opinion on where and how it is advisable to install air vents is in this video:

Prerequisites and consequences of the formation of air jams

In heating systems, untreated water saturated with air is most often used as a coolant. When heated, oxygen is released, and gradually accumulating microbubbles create a serious plug that blocks the free circulation of water.

If the liquid is supplied too quickly when filling the system, the gases do not have time to escape. The structure must be filled gradually: one floor of the branched system requires at least 1 hour to fill.

If there is a water leak in the system, or individual connections are not screwed tightly enough, air will enter the heating network. It can also penetrate during pipe repairs.

Tightness also depends on the type of material: the walls of polymer pipes without an anti-diffusion layer are permeable to oxygen. Some metals (such as aluminum) react to release gases from the coolant.

The accumulation of gas microbubbles can also be caused by errors during heating installation. To a greater extent, this relates to the absence of pipe slopes, which prevent air stagnation in certain places, from where the air does not enter the automatic air vent for heating. In such problem areas, it is necessary to install additional air exhaust devices.

Micro air bubbles reduce the efficiency of the system:

• Reducing heat transfer from radiators: top part filled with air, remains cold.
• Internal corrosion: Oxygen in the air destroys the inner lining of the equipment.
• Circulation disturbance: the movement of the coolant may be partially or completely stopped.
• Rapid wear of the pump: blades and bearings circulation pump experience regular overloads, this leads to premature failure of the device.
• Additional noise: radiators, pump, pipes constantly hiss.

An effective way to eliminate all of these problems is to install a manual or automatic air vent - a device for bleeding air from the network.

Aluminum, present in modern battery alloys, acts as a catalyst for the decomposition of water. Gas bubbles accumulate in places where there are congestions for free circulation and create traffic jams.

Air blocks can often be observed at the top of heating radiators. In such places, the metal remains cold upon contact. Therefore, a manual air vent is installed in heating devices - a Mayevsky tap, familiar to more than one generation of Russians since 1930. Another name for the rare model is a radiator needle air valve.

To date, modern batteries have developed different types automatic valves for gas removal that do not require regular monitoring. You can see such a model disassembled in this video clip:

Automatic gas vent device

The device is made in the form of a hollow body with a pipe, which is located in the lower part of the body. The cylinder contains a polymer float connected by a rod to a needle-type valve.

Operating principle of the device based on the application of gravity of a floating float. When it is in the upper position, the valve is closed; if it is lowered, the tap opens. The plastic float is connected to a spring spool. When gas bubbles enter the device, the float lowers, and at a certain moment the spool releases the hole for the gas to escape. After its removal, the housing is filled with coolant again, the float returns to its original position, and the spool moves, closing the hole. The mechanism is in standby mode. You can see the details of the air vent device in the photo.

1. The locking cap prevents water leakage in case of an accident and protects the hole from contamination. In new models, you can find the option of forced closing of the valve, which allows you to remove air manually.
2. A check valve with a built-in auto-lock makes it possible to service the gas trap without draining the water.
3. A float device is also useful when releasing a system or a separate area. Since lowering the water level in the chamber will automatically open the valve slightly, this will allow air to enter to speed up emptying.
4. The reliability of the gas outlet depends on hydrostatic pressure, which means that the operating pressure standards must be observed in the heating network.

The operating principle of the air vent can be seen in this video:

Design shortcomings include the requirement for cleanliness of the coolant. Dirty water gradually clogs the hole, which breaks the tightness of the outlet valve. To eliminate the leak, the mechanism is disassembled and cleaned.

Another weak point in such models is a leak in the threaded area between the device body and top cover. The problem occurs after the seal ruptures. The gasket ring must be replaced or the threads must be wound with fum tape.

Features of installing an air vent

Corner models are usually installed on radiators; alternative options are also produced, especially for modern heating devices. If? the collector does not match the connecting one? valves, use adapters. If the gas vent model does not provide a shut-off valve, it is advisable to purchase it additionally.

Modern automatic air vents are installed in a vertical position. In this case, it is necessary to ensure that the air fitting is directed upwards. Installation is carried out in the highest parts of the pipeline, boilers, heating devices, collectors and in areas where there is a large accumulation of air.

The installation process itself is carried out using a special open-end wrench, which is applied to the hexagon of the housing itself. It is under the flask.

Important! Installation using a lever wrench is not permitted. This can lead to significant damage and malfunction of the entire device as a whole.

In modern systems, a gas vent with an air valve is one of the important components that ensures normal liquid circulation. The design of the device is simple, like everything ingenious, therefore, with proper maintenance, it is quite reliable if you choose a high-quality model from a trusted manufacturer.

In any piping system that uses water as a working medium, a certain amount of air can periodically accumulate. Accumulated air can lead to various unpleasant consequences - corrosion of pipelines and installed equipment, the appearance of extraneous sounds in the pipeline, the occurrence of air locks and premature failure of the system as a whole. In order to ensure normal circulation of the working medium in the water supply or heating system, it is necessary to take appropriate measures to remove air - install a manual or automatic air vent valve.

Air vents for heating systems

Air vents installed on the pipeline for heating systems allow you to cope with the air that appears in the system. With their help, it is possible to promptly drain and remove excess gases and air accumulated in them from the pipes, thereby ensuring the further stable functioning of the system. Air vents can be used in pipeline systems in which the working medium is a non-aggressive liquid, both cold and hot.

The Terem company's assortment includes the widest selection of manual and automatic air vents designed for heating systems from leading European manufacturers- market leaders in safety valves – Itap, LUXOR, Watts.

Automatic air vent 1/2, 3/4

The automatic air vents presented in the catalog of our online store have different diameters for connecting to the pipeline system. For example, we have an automatic air vent DN15 and an automatic air vent (1/2, 3/4), the price of which is very affordable. Also among the products sold by the Terem online store are air vents with side connections and models with direct exhaust; manual air vents; corner models and models with shut-off valve. All safety fittings of this type are made of exceptionally high-quality and reliable wear-resistant materials - brass or nickel-plated brass and are suitable for installation on pipeline systems of apartments and houses.

Buy an automatic air vent – ​​prices

Automatic air vent, which can be purchased from the Terem company at a very competitive price, is a device that ensures the functionality of the system as a whole. That is why the assortment includes only reliable models with a long service life, the quality of which is beyond doubt. When choosing suitable model of this fitting, one should take into account such a characteristic as the price - the automatic air vent purchased from the Terem company fully justifies its cost and performs its intended function efficiently.

In our online store GlavTeplo.com, along with other heating equipment, Air Vents are presented in a wide range, as well as their detailed description, which you can find by going to detailed description goods. Right choice, Our highly qualified consultants will always help you do this. All air vents presented in our online store are certified and have a number of permitting documents, which you can request when purchasing a product. You can order goods in our store without leaving your computer through the website shopping cart or by phone. To confirm the order, our managers will call you back and also agree on the time, timing and cost of delivery. Delivery to Moscow and the Moscow region. (Volokolamsk, Ramenskoye, Pushkino, etc.) is carried out by a store courier within 24 hours, as well as in Krasnodar, Astrakhan, Nizhny Novgorod and other regions of Russia transport companies as soon as possible. Having made one purchase in our store, you receive the status of a regular customer, thanks to which you can purchase goods at discounted prices.

The air that enters heating systems can cause a number of negative effects, including the cessation of operation of part of the system, the occurrence of corrosion and even the destruction of the pipeline. The air is especially harmful for large closed heating systems. In order to avoid this, air vents with a diameter of 1 inch (25.4 mm, the closest Russian analogue DU25) are used - these are special devices that do not allow the flow of the working fluid to be interrupted. They are usually installed in the upper part of the heating radiator manifold, since warm air accumulates in these places.

Types and designs

Structurally, the air vent is a float in the middle of the body, which closes the valve if there is no air in the system, and opens it when gas appears. The open valve releases air into the external environment.

Depending on the principle of operation, these fittings are divided into:

• straight with vertical mutual arrangement of thread and body;
• corner with perpendicular arrangement;
• radiator ones, on which the threads coincide with the corresponding threads in the radiators.

In the class of 1-inch air vents, there are also horizontal, float and non-blocking ones, but they are less common. Manually operated Mayevsky valves are also very popular.

Manufacturers offer several types of air vents, which differ in the following parameters:

• manufacturing materials;
• sizes;
• control (manual and automated).

The price of models with manual control is slightly lower, they are also smaller in size, so they are most often chosen for everyday tasks.

According to the materials of manufacture, brass, plastic and steel (from of stainless steel) air vents.

The 1-inch air vent has a relatively large opening diameter, so it is used for large and powerful heating systems.

Features of installing a 1-inch air vent

It is mandatory to install gas vent valves on aluminum batteries, since hydrogen is formed there. For the same reason, an air vent must be installed on bimetallic radiators.

Cast iron and tubular radiators, registers and batteries of obsolete types do not require such a system, since to remove air there it is necessary to remove a large amount of the working coolant medium, which is unacceptable for an air vent. Installation and dismantling of these types of fittings is best done in the presence of a specialist.