The Maevsky crane is a special device that is intended for the release of accumulated air in heating systems. The key factor in the efficiency of the coolant circulation systems is the absence of air plugs in the mains, especially in the end loops.
Scheme devices crane Maevskogo.
Heating schemes in multi-storey buildings must necessarily have the Mayevsky cranes in their design, since when the coolant is supplied, the air volume accumulates in the radiators located on the upper floors of the buildings. The installation of these devices, which allow the removal of air, is carried out according to the draft of the pipeline system for the movement of the coolant.
The Maevsky type crane is a product made of metal that has an ½ or ¾ inch external thread. The core of the device contains a screw with a thread, capable of moving in a horizontal projection. The end of the screw has a conical shape, respectively, the inner part of the body of the crane is equipped with a conical seat, ensuring tight fit of the screw end. The locking conical mechanism can be rotated by means of a screwdriver, key or have a special grip.
The principle of operation of the Mayevsky crane.
When the core of the crane is unscrewed, the heating system is depressurized, that is, squeezing the accumulated air or liquid into the environment. To prevent turbulent spraying of a mixture of air and liquid, the body of the article has a hole with a diameter of about 1 mm, serving to guide the air-drop mixture.
The Maevsky crane is installed in the upper plug of the radiator, since the formed air jams accumulate in the upper part of the heating devices. Depending on the layout of the distribution of the coolant supply, the locations of installation of the vent may differ. There is a rule according to which the Maevsky crane is installed at the highest heating points in the building. If this is a multi-storey house, then the minimum requirements require the presence of this device on each radiator by the riser on the top floor. This makes it possible to remove air, which inevitably enters the system when starting heating. In one-story houses, the Maevsky crane is installed at the most remote points from the heating boiler or from the circulation pump. In some cases, it may be necessary to install additional cranes in the radiators, this depends on the implementation of the layout of the supply pipeline.
Venting the heating system
The ideal variant of the heating scheme of the building contains the obligatory presence of a similar crane in each radiator. This step is advisable in a convective method of supplying heat in one-story buildings, as this increases the likelihood of accumulation of static air volumes in the upper part of the heating radiators. Removal of air from the heating circuit by means of a Maevsky crane is performed in the following cases:
- The coolant is fed to the building, but the radiators are completely cold;
- partial heating of batteries;
- batteries heat up, but their temperature does not match the data at the entrance to the system.
The assembly scheme of the crane Maevsky.
To remove air in multi-storey buildings with central heating, the process begins with any radiators having a Maevsky crane, regardless of their location. In buildings with autonomous heating, they begin to exhale the circuit with the battery closest to the boiler (pump).
The process is as follows. With a screwdriver or through the tip, slowly unscrew the crane screw. The filled system leads to the appearance of the noise of the exhaust air, usually the screw is turned off for 1-2 turns. After a while after the release of air, water begins to appear, and the release can not be stopped because a mixture of air and water first comes out, this can be accompanied by a certain noise and spraying. It is recommended to adjust the output speed with a screw until clean water appears. If there are no signs of air for a minute, the discharge process is stopped and the screw is screwed. Then go to the next radiator.
Successful completion of the process is considered to increase the temperature of the heating battery.
It is necessary to use the tap in case the radiator does not warm up or if there is insufficient heating with respect to the whole system.
Methods for installing the device
The Maevsky crane is installed in the upper plug of the radiator, from the opposite side of the inlet of the pipelines. If the system implies a transit passage of the coolant, then the product is mounted on the opposite side from the water supply to the battery.
In the case of installing a new heating circuit, the batteries in which the vent will be installed in advance are provided in advance, this requires the presence of special through-flow plugs into which the air-vent valve will be screwed.
Sometimes it is necessary to additionally set the reset point in the existing heating system. To do this, remove a dead plug in a particular radiator, a plug with an internal thread for the valve is installed in its place. The threaded connection of the vent is sealed in a classic way with the help of a linen pencil or FUM tape.
The installation procedure for the Mayevsky crane.
It is advisable to use the Mayevsky crane at least once in the heating season, even if it is not required, it is important to turn the screw to a certain angle. This achieves the prevention of thread conical saddle, which allows you to keep the device in working order.
In some cases, after discharge of air there is a slight leakage of the screw thread, this is caused by the ingress of foreign particles into the valve seat. To eliminate this effect, you should try to dump additional part of the water from the radiator to wash out the tapered cone.
List of tools for installation
- adjustable or gas wrench;
- пакля, лента FUМ;
- screwdriver, pliers or screwdriver key.
It is necessary to take into account that the air release valve has a small section of the liquid flow and is not intended for its collection. Installation of the device is best done in summer, when the heating system is not started.
It is recommended to plan the installation of the discharge valve in advance, as it is very difficult to separately equip the used radiator with a crane due to the complicated dismantling of the plugs, which can lead to questionable results.