Maevsky's crane is a plumbing device for airbagging from heating radiators.
Due to the fact that the heating systems are installed in all houses and apartments, it is necessary to choose the right Crane Maevsky. How to choose and install? What model to give preference? How to use the key to crane Maevsky? Consider further.
The scheme of the structure of the crane of Maevsky.
Principle of working crane
Choosing one or another type of locking reinforcement, it is necessary to understand the principle of its work and the feasibility of editing.
How does the air appear in the radiator? In the process of circulating the coolant, a certain amount of air is formed in the system. Air, in turn, forms bubbles in places with a small speed and low pressure of the coolant. Bubbles create air traffic jams that prevent the free reference of the coolant in the system. In addition, the air can appear due to the downtime of the heating system. For the full functioning of the system, it is necessary to remove air, and this is already working for the crane of Maevsky.
On the tap cut the standard outer half-one (¾, 1 inch) thread. The rubber sealing ring is put on the carving body. Thanks to the standard thread, the faucet can be installed on any battery.
The scheme of the crane of Maevsky: In the housing 1, made from brass, is a float 2, connected by lever 3 and with an exhaust valve 4.
A small specialized key to the crane is designed to maintain the device installed on the radiator in the niche, where the use of a screwdriver is not possible. The design of the key protects the heating system from children's pranks, which will certainly be rated by the parents of small "hosts".
The main mechanism of the crane is a shut-off needle valve. The valve control inside is carried out by a special locking screw, the head of which is made under the tetrahedral key and under the screwdriver at the same time.
The valve is installed opposite the supply of the coolant or thermostat on the radiators from the upper side. During use, you must open the needle valve with a screwdriver or key (unscrew it into several revolutions), through the overlapped with a needle valve, the hole will start out the air.
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Specifications and device
Crane for opening is rotated counterclockwise, closed - clockwise. After the output of all air from the system, the crane can be closed.
If the system assumes the use of a pump forced circulation of the coolant, then before the air booming process it is necessary to turn it off and wait a few minutes. This action will help stop the movement of the coolant ceased, and the air will be able to rise to the upper part of the radiator. With the pump turned on, the air boom will not be effective, because the air is fascinated by the flow of the coolant, the air will not have time to climb up and linger at the top of the radiator.
Hand air vents are the simplest model of the crane of Maevsky. Its housing is performed from high-quality brass, and the head of plastics. It is suitable for a 3/4 "or 1/2" radiator adapter.
Convector work: 1 - body (casing); 2 - legs; 3 - heat exchangers (1-4); 4 - mounting part; 5 - Crane Maevsky; 6 - fans; 7 - el. distribution box; 8 - Roll control.
The automatic aircraft valve (automatic) is also made of brass, but has a more complex design. The ball automatic crane of Maevsky is produced in a brass or nickel-plated (chrome) housing, the crane form is designed for a screwdriver or a tetrahed key.
Such a crane of Maevsky has a diameter of 1 "and is installed on the radiator without an adapter. Its installation will be the most effective in the autonomous heating system. However, it is not necessary to mount the automatic for cast iron radiators of the central heating system, since it passes the circulation of water with dirt particles, which will lead to clogging of the crane.
In addition, central heating is often disconnected, which leads to a constant formation of air in large quantities. Considering that the outlet of the crane has a diameter of only 2 mm, to produce air from the system after its stop will have for a long time.
For such systems, special automatic cranes are available that can withstand hydraulic blows up to 15 atm. That in the central heating system is not uncommon.
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Domestic manufacturers produced special cranes for cast iron radiators according to GOST9544-93. The design has a brass housing and is able to withstand temperatures up to 150 ° C, designed to work both in the aqueous medium and in steam heating.
The most complex design is a ball aircraft with a safety valve. Its valve is able to protect the radiator from the hydraulic impact - sharp pressure jumps in pipes up to 20-25 atm. The system of springs inside discharges the water when the pressure in the system reaches 15 atm. This feature is particularly relevant when installing pipes from polypropylene, metalplastic or coated polyethylene, which can burst.
Installation and replacement of the crane of Maevsky
Maevsky's ball mechanism does not require special knowledge for self-installation. If an opening is not provided on a radiator in the traffic jam to such a mechanism, the cork can be replaced. Now the mechanisms are released with a thread ½, ¾ and 1 inches. When buying, pay attention to such an element as a crane laying: it should be silicone or rubber, but not paronite.
To screw the mechanism, install it so that the hole for the air shutter is a bit down. Thanks to this, water that will go after air booming will be convenient to collect in the container - bucket, pelvis or bucket. For the suspension, you can choose a fume tape or linen winding as a seal on a thread.
Replacing the crane is carried out similarly to its installation. It may be necessary to use a gas or adjustable key to hold the cork itself so that it does not get twisted with the crane.
Consider that all plug plugs on radiators are equipped with the left thread, a plug is weakened during the crane screw, so it needs to be kept key.