The Maevsky crane - the principle of work

With the onset of cold weather, the issue of the heating system in the house becomes especially urgent. But often even with absolutely good heating, some of the radiators remain cold. The blame for all air entering the system together with the coolant and forming stoppers, preventing its free circulation. One way to drain excess air from the system is to install special air vents at certain points, which can be used as ordinary water faucets, or Mayevsky cranes. More information about what device has a crane of Majewski and how to properly use it, you can learn from our article.

Characteristics of the Mayevsky crane

So, what is the crane of Majewski? Basically, this is a conventional needle-type shut-off valve. Actuate the valve quite easily - just insert a special tetrahedral key or slotted screwdriver into the hole and turn it anti-clockwise until it stops. The Maevskogo crane in size is designed for installation on heating radiators of various designs, the outlet openings of which have a diameter of DN 15.

How does the Mayevsky crane work?

Now we will consider in detail how to correctly use the Mayevsky crane. So, one of the radiators is suspected of having an airlock in it. Most often, such suspicions arise if the radiator remains partially or completely cold, while the rest of the heating system is working properly and the coolant in it is well heated. What to do?

1. Let's start with the preparatory work, because the water flowing out of the heating system can hardly be called clean even with a stretch. Therefore, first we remove from the room with the problem battery all the valuable things, turn off the carpets and move aside the furniture standing next to the radiator.
2. If it is a question of an autonomous heating system with forced circulation, then it is necessary to start the work on radiating the radiators with the pump off. After this, you will have to wait 10-15 minutes for the water in the system to slow down and the air bubbles rise up. Otherwise, it will not be possible to release air from the system.
3. We reserve the capacity in which we will collect the water that flows out of the battery. We also need a floorcloth.
4. After all we need within our reach, we need to open the Maevsky crane. To do this, let's take a special tetrahedral key (a slotted screwdriver) in hands, insert it into the thread on the tap and start slowly turning counterclockwise.
5. As soon as the air starts to escape from the faucet, and usually it happens with a loud hiss, the crane is no longer needed to turn on.
6. At the moment when the water from the tap of Mayevsky starts to come out of the tap, it must be turned clockwise and closed. It is possible that the air from the pipe will come out in a mixture with water. In this case, you need to substitute a pre-prepared basin and wait until all the air is released.
7. Usually these simple actions are enough to completely remove the air plug and solve the problem of cold batteries. But if all efforts have not been successful, then you will have to turn to a plumber for help - perhaps a snag lies in mechanical obstruction inside the radiator.

Automatic cranes Majewski

Another type of air vent is automatic Mayevsky cranes. They, like their mechanical counterparts, also help to extract air from the heating system, but they do it without human intervention. They work on the principle of a float: as soon as the amount of air in the system exceeds a certain level, the float mechanism opens the valve. But such cranes are more exacting to the quality of water, so there is simply no point in installing them on old heating systems, since it will be necessary to clean them permanently of rust.