How the Maevsky crane works and how to use it

crane The Mayevsky crane is a device that is used to release the heating system from air masses that damage heat transfer. You can open and close it using a screwdriver or a special key. The crane of Maevsky, whose work principle is simple to genius, has been used in practice for more than 80 years. And it is by its simplicity that he deserves the confidence of consumers.

According to state standards, this device is referred to as a radiator air needle valve. And the crane of Majewski is a popular name.

Composition and operation principle of the

crane The device of the Mayevsky crane does not allow to open it to anyone and at any time. This is done for reasonable purposes, since if it is possible to open it easily and conveniently, everyone will drain the water from the batteries( especially the residents of areas without hot water supply), and this will cause heat loss. In addition, this design avoids children's antics.

The design of the Mayevsky crane consists of:

• body;
• screw in the form of a cone.

Both parts are tightly connected. They are produced most often from brass. This metal is not corroded, which allows the device to serve for a long time. The bleeding of the air masses occurs through an opening in the side of the shell with a diameter of 2 mm. When the valve opens, air exits.

Obviously, due to the extremely small diameter of the air outlet, it is a weak point in the faucet, since it can clog, but it is easy to clean. To do this, open the valve and release the holes from clogging with a conventional needle.

Mayevsky cranes can be opened in various ways - a special key, a screwdriver, a wrench or all of this at the same time. Also there are cranes, which open with a special handle without any adaptations.

There are also automatic cranes Majewski and the principle of their work is similar. Only the automatic opens itself, when air appears in the coolant. The device reacts due to the separation inside it with a float made of plastic. When the compartment is filled with air, the float with the help of a spring structure opens the outlet to the air. When there is no air, the float closes the valve.

The automatic version is suitable in cases where heating is installed in hard-to-reach places or when it is required to release the coolant from the air often.

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According to the laws of physics, the air in the pipes tends to rise. Therefore, the installation of the Mayevsky crane should be carried out on the last floors and on the upper part of the radiator. Otherwise, there will be no effect from it.

How to release air from the

heating system The simplicity of the design entails ease of use, but before using the Mayevsky crane, you must take care of the cleanliness of the procedure - in order not to flood the neighbors and damage the floor, you need to prepare a bucket.

To get the air out of the radiator you need:

• Put the bucket under the drain hole, so that in case of water leakage, it does not hit the floor.
• Using a special wrench, screwdriver or wrench, turn the valve counter-clockwise one turn.
• After this, a characteristic hiss should appear, which indicates the air outlet from the pipes.
• Then the drops of water will go. Once the water starts to flow in a trickle, turn the valve clockwise.

It must be remembered that the later the Maevsky crane is closed, the more water will flow out of the heating system. It threatens with flooding and poor efficiency of the coolant. Therefore, when removing air from the pipes, you should always be near.

Tips for operating the Mayevsky crane

• If a lot of air has accumulated in the heating system, you can turn the crane not by 1, but by 1.5-2 turns, to speed up the process.

If you unscrew the cone-shaped part completely, it will then be difficult to insert it into place because of the water pressure. So do not overdo it.

• If the heating system is working with a pump that forces the coolant through the pipes, then before uses the MAE crane, you must disable it. You can start the procedure only after 5 minutes after this. Otherwise, it will not be possible to extract air masses efficiently.
• Mayevsky's automatic cranes are not recommended for installation in conditions of a contaminated coolant. He will often clog up and have to be cleaned.
• In central heating, you should use MAE OMEC cranes or domestic MC-140 cranes. They are able to withstand overloads of up to 15 atmospheres, which are frequent in such systems. And also they can be used on old cast-iron radiators.