Installation and description of the automatic air vent

All heating water systems are characterized by the appearance of air locks. This problem can be easily solved if the heating circuits are open, in such situations the air flows freely naturally. But in closed heating systems, it is necessary to install special devices that will help remove air from the line. An automatic air valve will help solve this problem.

Need for an automatic air valve

Automatic air valve bleeds air from radiators

The air relief valve from the water supply system must be installed for the following reasons:

  • for bleeding air droplets that have accumulated in the heating main;
  • in order to reduce the uneven heating of radiators, which is provoked by the formation of air jams;
  • for the need to protect the part of the pipeline that is laid at a height, for example, in the area of ​​ceilings.

The higher the heating pipes are raised, the greater the risk of air congestion. If it is not possible to eliminate the phenomenon, the movement of the coolant is disrupted, which leads to a deterioration in the quality of heating the room.

The main task and principle of operation

Moving along the contour of the line, the coolant will follow the path of less resistance. If there is an air lock in the pipe, it will obstruct the passage of water. As a result, batteries in which air has accumulated warm up only partially or remain completely cold. Airing not only reduces the quality of heating, but also disrupts the operation of all elements of the system. To eliminate the negative consequences, you need to install an automatic air vent.

If the heating system does not have an automatic air purge, you may encounter the following problems:

  • the boiler will fail as a result of constant overheating;
  • the heater will corrode;
  • the boiler will operate at maximum power, but the radiators will remain slightly warm;
  • in severe frosts, the risk of freezing a part of the circuit or one of the radiators increases;
  • due to sudden pressure surges in the system, damage is formed that will lead to leakage.

An automatic valve for bleeding air from the heating system will help solve the problem without human intervention. If the system is working properly and there is no airing in it, the float of the device will float on the surface and press the plug on the outlet. If, as a result of the formation of a blockage, the water level in the radiator decreases, the float goes down, this opens the valve for bleeding.

Valve device

The automatic air vent consists of a cylinder with a built-in plastic float. The device is installed vertically, in normal operating mode its inner part will be tilted under the influence of the heat carrier. The air vent is equipped with a needle rod, to which the float is attached to the lever.

As soon as a plug forms in the pipe, the air will tend to the highest point of the heating circuit. If an automatically operating valve is installed in this place, the heat carrier will be pushed out by air.In the process of displacing water, the float will descend, opening the valve. As a result, air will escape from the pipes and radiator, and the space will be filled with water.

The air vent valve becomes scaled up during operation. This leads to disruption of its operation, loss of tightness. The automatic air release valve can only be replaced, it cannot be repaired.

Types of automatic air valves

Device types

By design, the devices are divided into three types.

Direct traditional

The most common are air vent valves with direct connection. They are used to bleed air at the highest points in the pipeline. To do this, they are installed at the top in vertical risers.

Corner

Instead of a conventional tap to automatically drain the air lock from the heating system, corner structures can be installed. This type of equipment is most relevant if there are always gases in the line, especially a lot of them are present in the radiator part.

Special for radiators

Radiator-type devices are specially designed for installation directly on batteries. For this, they have a threaded connection. Such valves are mounted on aluminum and bimetallic radiators, on those devices that come in contact with water. In this case, the installation of a radiator device is necessary.

Location and installation

Installation diagram

When installing the air release valve, the following factors must be taken into account:

  • Air in the water supply system and in the heating system accumulates at the highest points of the equipment. This feature is present in radiators, floor heating collectors and heating boilers.
  • If the installation location is incorrectly selected, the thermal balance will be disturbed. Because of this, the efficiency of heating the room will be significantly reduced. If we are talking about underfloor heating systems, if installed incorrectly, whole cold zones are formed.

To avoid the consequences of incorrect installation, it is recommended to follow the advice of specialists. The air vent must be installed in the following places:

  • in the area where the pump-mixing unit of the heating boiler is located;
  • for underfloor heating - on equipment collectors;
  • on additional equipment of the heating boiler, while it is necessary to select the highest point near the expansion tank;
  • on standard radiators.

The insulated valve can be installed on the hydraulic arm.

Reasons for the appearance of air and air congestion

Airing of the heating system can occur for several reasons:

  • Pipes fill up with heating medium too quickly. Due to the increased speed, the water does not have time to displace the air naturally from the line. The heating medium must begin to flow from the lowest point so that the air goes up through the open hole.
  • No preparatory work was carried out before starting the heating system. As a result, the heat carrier contains an increased amount of soluble gases. During the heating of the water, they separate and accumulate in the pipes, forming a plug.
  • Repair work was carried out to replace individual parts of the pipeline, but the water was not completely drained.
  • Corrosion started in the pipes. When the metal comes into contact with oxygen, hydrogen is released, which gradually accumulates in the heating system.
  • The tightness in the heating main is broken.

Installing an air vent will help avoid problems due to the accumulation of air masses in the pipeline. Thanks to the device, you can improve the quality of heating and extend the life of the radiators.

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