Efficacy water heating systems reduce air pockets. To fight them bleed screw used. This instrument was invented in 1933, is named after the author's name and survives today with minor changes. In the documents it is often called differently: a crane to lift the air, the radiator air valve needle.
Design and function
The occurrence of air pockets experts called by the term "airing." Because it decreases efficiency of heat radiators, run the corrosion processes appear mineral deposits in the pipes. Movement of the coolant into the system is accompanied zavozdushennoy vibrations that disrupt the heating elements of the systems.
Important! Causes of Majewski designs have socio-economic background. Initially, the air from the radiators produced through conventional shut-off valves. The population began to consider them as a source of hot water. This approach protects human health and the deduced heating system failure.
Engineer available Majewski improved to the point solutions and implemented a simple design. Its basis - the needle valve. When the valve is opened the gas in the heating radiator is discharged. Then the valve closes. In addition to the manual valve, creates an automatic version of the crane Majewski. He shall ensure the elimination of air pockets without human intervention.
The manual air vent
The manual tap structure for venting includes four parts:
- housing;
- the locking screw with grooves for air passage;
- housing cover with venting;
- sealing ring.
When air grazing the user rotates the screw - the working of the valve body. Conical screw tip opens Air Release channel. the screw head is a multi-faceted slotted. This makes it possible to use a screwdriver or a special key for manual opening (or closing) of a crane Majewski. Sometimes the product is supplied with a lamb, allows you to rotate the screw without a tool. This solution is convenient, but not safe, especially if children are present.
The diameter of the channel through which air escapes, usually equal to 2 mm. The hole of this size does not clog. Loss of water on completion vozduhootvedeniya through 2-mm hole is negligible. Flooding does not occur, the consequences are liquidated ordinary cloth. In addition, a small diameter makes it easier to secure locking Air Release channel even when the hydraulic shock.
Housing cover most often made of plastic. The remaining parts of brass or mild steel. Externally, the air valve cap resembles a tap with an external thread. Manufactured cranes threaded ½, ¾ and 1 inch. The water temperature at which the air vent retains its functionality, can reach 120-150 ° C, pressure - from 1 to 1.6 MPa.
The design of the automatic air vent
Automatic air detects accumulation of gas in the heating circuit and eliminate it. The main components of this device:
- housing;
- float;
- lever system;
- an upper cover;
- a needle valve with return spring;
The operating principle of the automatic air valve is based on the ability to track float liquid level. The air present in the heating system, the float chamber fills. Float drops, via a linkage system acts on the valve closing element. The needle valve is opened, the air coming out of the float chamber. It is filled with coolant, the float rises, the air valve is closed.
The advantages of manual and automatic air vent
During the existence of water heating systems produced several methods of struggle with the airing: air bleed through the thread, use as a deaerator stopcocks and so on. Majewski design stands out among the other advantages:
- air pocket can be eliminated quickly, by turning a screwdriver or a special key, to the supplied air valve;
- a radiator mounted on the air valve is cheap, simple in construction, reliable;
- valve life is durability of the heating system as a whole.
Automatic deaerators are installed at the high points of the heating system. Their existence, people living in the house may not be aware. This is their main advantage - airing of the heating network is eliminated without human intervention.
Installation of cranes Majewski
The heating system normally present both options Majewski valves - manual and automatic. They are installed in different locations. Manual valve mounted on radiators and towel dryers, automatic - at the high points of the heating circuit and as part of the security group.
Installation manual air
According to the position of lead pipe heating circuits are divided into vertical and horizontal. At arrangement of vertical contour air vent installed on the radiators, heating the upper floors of buildings. Horizontal circuit assumes their presence on each heating device.
Majewski cranes are suitable for installation on all types of radiators, including cast iron. At the top of the radiator, the right and left are places for joining pipes. One of them is often closed by a stopper. Instead, it is screwed Threaded internal thread which is suitable for the installation of air vent.
Remove the stopper is not always possible, especially in the old radiators. In this case it is necessary to drill a hole cut in it a thread on it to establish a checkpoint nut, then valve for venting. Threaded connections are sealed FUM-ribbon or tow sanitaryware.
When implementing air vent-pipe heating circuits must be present at Majewski of towel. Many models of these devices are made with already installed valves to release air. If their factory setting is not available, simply enter: in section between the inlet pipe and the dryer is installed tee. The free threaded outlet tee screwed air valve.
Installation of automatic air vent
Automatic air valve mounted at the top of the heating system. If during the operation revealed the place where the air bags are produced continuously, in these parts of the system are mounted automatic bleed accumulating gases.
For ease of installation of the valve releasing two versions: vertical and horizontal arrangement of the thread. Automatic valve mounted similarly to the manual. After installation, you need to lift the cap on the valve, tightly wrapped hood will not leave the bleed air.
Closed heating systems are equipped with the so-called security groups. This structure consisting of three instruments: manometer, safety valve and automatic air vent. Security Group purchased and installed in assembled form.
Important! The most effective system to combat multi airing. These include manual valves mounted on radiators and towel. Automatic faucets discharged air going around the heat loop.
Tools and materials required for installation
Installation manual and automatic valves for venting air is carried out using conventional plumbing tools and materials:
- gas or universal keys large size;
- spray for rust removal - will help when unscrewing the cap of the radiator;
- FUM tape or flax tow - to seal the threaded connections;
- medium-sized screwdriver slot or a special key for opening (closing) of the air valve.
In the manufacture of new threaded connection between the air vent and the thermal device will need serious locksmith tools:
- powerful drill;
- pobeditovymi set of drills with tips;
- to ½ inch tap;
- emulsion for cooling the drill, it is often replaced with kerosene or water;
- rags, cleaning rags.
Features of operation
A crucial moment in the life of the heating system - its original filling. At the same time volumes of air are displaced such that the cranes Majewski can not cope with them. Come to the aid drainage, shut-off valves.
Start heating after long periods of inactivity - at least an important stage of operation. After start-up frequently found uneven warming radiator. In this case, the user is armed with a screwdriver, a jar with a wide neck and a cloth. Next begins the air bleed. To the drain is inserted bank, half a turn anti-clockwise turns the locking screw.
After air outlet pauses hiss coolant begins to flow. Next, the screw is twisted, thereby closing the air valve. The course is a rag, eliminates signs of a struggle with the airing.
In the automatic air vent has a weakness - they do not perceive the contaminated water. Clogging can be diagnosed if the heat-carrying pipe directly under the flap does not get warm, that is a traffic jam, the valve does not work.
Repair begins with disassembly. Valve for venting typically connected to the system via a shut-off valve. Its mission - to allow to remove the air vent is not emptying the system. Filmed crane is disassembled and cleaned, the operation is performed in the presence of plumbing skills and operating instructions.
recommendations made
Aluminum radiators, bimetallic and other more prone to the formation of air pockets. This is due to the fact that aluminum in contact with water initiates a chemical reaction with hydrogen. Therefore, thermal devices fabricated using aluminum - first candidates for installing the dampers.
The presence of air in the heating circuit indicates not only non-uniform heating of the radiators. Pipes and heaters sometimes begin to sound. The reasons may be different. Common - the appearance of air pockets.
During periodic airing bleed screw have to use repeatedly. This may indicate undervalued pressure in the heating circuit, the slow movement of the coolant. In this case, insufficient air bleed. Necessary to attract specialists, diagnostics and repair of the entire heating system.
Thermal systems installers recommended to install a filter automatic valve. Inexpensive apparatus frees the need to periodically remove and clean the automatic air valve.
