The presence of air and air locks in the heating system can lead to the following consequences: a decrease in heat transfer from heating devices, premature corrosion of materials, a decrease in the flow rate of the coolant, premature failure of a circulation pump with a wet rotor. The Mayevsky crane (manual air vent), a device designed for manual air release from heating radiators, will help to solve all these problems.
Mayevsky crane on a steel panel radiator.
Its official name is the radiator needle air valve. It is under this name that it is enshrined in GOST.
On which radiators it is necessary to install gas vents
Installation on aluminum batteries is required. When aluminum comes into contact with a coolant, water decomposes into components, one of which is hydrogen. Therefore, it is imperative to remove gases in such heating devices.
Installation on partially bimetallic radiators is desirable. In them, the contact area of aluminum with the coolant is greatly reduced, but it is still present. Therefore, the installation of the Mayevsky crane is desirable.
It is a straight and angle automatic air vent. They can also be put on radiators, only the "pimp" should look up
Fully bimetallic radiators are safer in this regard: their entire core is made of steel. But many manufacturers require such a device in their installation recommendations.
These devices are ineffective on cast-iron radiators of old forms. In them, air removal is possible only together with a sufficiently large amount of coolant. And these devices (both manual and automatic) are not adapted to this. In this case, standard or ball valves are installed to bleed air.
With tubular radiators and registers, the situation is about the same as for cast iron: only taps work effectively. Therefore, it makes no sense to put air vents on them.
This is a needle air vent valve, or a "Mayevsky" valve
Installation of Mayevsky cranes on steel panel radiators is mandatory. The fact is that the passages for the circulation of the coolant have a small diameter. And if an air lock forms, the movement of the coolant will be blocked. It will stop heating completely or partially. The plug can only be removed by draining most of the coolant and filling it again. Therefore, most often panel radiators come directly from the factory with air vent valves.
Why and how is the system airing ^
The heat carrier, circulating in the water supply system, emits air bubbles. As they merge, they create impressive traffic jams in the areas located at the top. The constant flow of fluid slows down and stops. The second reason for airing is downtime / shutdown of the heat supply. This is where the air vent comes in handy, the role of which is to remove air barriers, clearing the way for the water flow.
Mayevsky's taps are installed not in random, but in predominantly "correct" places - where a large accumulation is highly possible, or directly on the batteries. Normal brass the faucet is designed for temperatures up to 150 degrees. Unlike "brothers" from other metals / polymeric materials, bronzebrass
the sample is not dyed. The leading types of these devices are two - for self-timer and manual.
external view of the air bleed valve std 7073v brass
The first of these air venting devices is classically located on the "top" of the main riser, and the second - on the heating battery itself. They are fitted with fuses - such a modern maintenance standard.The nature of the execution (direct, angular, vertical, horizontal) is selected according to the indicators of the unit of the heat pipe system.
The air vent is compact and easy to use
The yellow alloy body does not provide a guarantee that a mechanism like a 11b6bk brass cone valve will be operated, which has the function of a heat flow blocker. Its walls cannot survive critical temperature jumps: they "tolerate" the passage of a medium heated to a maximum of 100 (or better, up to 80) degrees. For relatively "cool" connections, this constipation is fine - but not for heating.
Mayevsky's automated crane looks like this
Types and technical characteristics
These devices are of two types according to the method of diversion:
- manual;
- automatic.
They are made with different diameters. The most common ones are 1/2 "and 3/4" (half an inch and three quarters of an inch). There are still 1/8 ", 1/4" and 3/8 "in nature, but they are not used in our systems. Most often, modifications are used with a half-inch diameter 1/2 ", in another system of units it is also called DN 15. In this case, the number 15 is the designation of the connecting size in millimeters.
Manual and automatic device for removing gases from the heating system
In addition to diameters, the following parameters are also important:
- Operating pressure. In most models, it is 10 atm, there are devices designed to work at 16 atm.
- The type of working environment. There are air valves, there are those working with liquids. Heating systems use fluids or universal (both air and liquid).
- Working environment temperature. Most often they are found with an operating temperature of 100 oC - 110 oC. There are some that work up to 150 oC.
- Thread type: external or internal.
These technical characteristics of the air ducts must be matched to the existing type of system. For individual heating systems, any are suitable, but when choosing devices for radiators powered from centralized systems, you need to know both the pressure and the temperature for your house (check with the housing department, DEZ, ZhEK, etc.).
Crane selection criteria
The plumbing market today is rich in various offers, everyone can find what suits him in terms of price and quality. When buying and installing stop valves, you should clearly understand what the valve is for, and not clutter up the structure with unnecessary details - this is not only expensive, but it will also have a bad effect on the operation of the entire heating system.
Taps for radiators are selected taking into account the type of device that is used as a heat carrier, as well as the type of circuit of the heating system.
Pipes of the appropriate diameter should be selected to minimize the number of valves used, and valves with the maximum capacity should be selected.
The strongest and most durable materials used in the manufacture of valves are steel and brass. These are thick-walled products that will last longer, but when choosing it is important to pay attention to the quality of the gaskets.
Note! Modern sealing gaskets, which are used when installing taps, are made not of rubber, but of silicone, since this material is not subject to destruction and does not lose elasticity when exposed to high temperatures, and as a result, it lasts longer than rubber.
An important selection criterion is the manufacturer of the product. As a rule, the goods of well-established brands with a worldwide reputation are an order of magnitude superior to their counterparts of little-known manufacturers. Firms whose products have been tested in domestic conditions and have positively proven themselves:
- Italian companies Itap and Luxor;
- German company Oventrop;
- Danish manufacturer Danfoss;
- joint Russian-Italian company Valtec.
We recommend that you familiarize yourself with: How to make a galvanized pipe with your own hands?
The principle of operation of the automatic air vent
The designs of these devices may change, but the principle of operation remains the same. The device is a hollow cylinder, which consists of two parts - upper and lower. They are connected to each other by means of a thread, the tightness is ensured by a rubber (silicone) O-ring. There is a small cylindrical hollow protrusion at the top. Air exits the system through this protrusion. It has a thread on which a plastic (polypropylene) cover is screwed. With this cover, you can, if desired, stop the bleeding of air (screw it on).
One of the devices is simple and effective
The operation of the automatic air valve is based on the buoyancy of a float placed inside. The float is connected to a rod that acts on a spring-loaded spool that closes the outlet. If there is no air in the system, the air vent body is filled with coolant, the float has risen up. In this position, the rod supports the spool, and air does not come out (and does not enter). When air appears in the system, the coolant is gradually displaced, the float goes down. The rod does not push the spool as hard and the spring opens the outlet. The accumulated gas comes out, the coolant is again recruited into the body, the valve closes.
One of the models with a more complex spring-loaded air release mechanism
In devices of different companies, the mechanism of action on the spool is different, but the principle is unchanged: the float is at the bottom, the valve is closed, when it rises, it is open. The principle of operation of one of the modifications is demonstrated in the video.
Types of automatic air vents and their installation
These valves can be straight or angle, there are special models for radiators. Specialized or angled modifications are more often installed on batteries. They are screwed into the radiator manifold (if the diameter allows) or installed through an adapter.
Regardless of the type, install the device so that the outlet (cap) is directed upwards. There are two mounting methods:
- screw directly into the thread of the appropriate size;
- first put the shut-off valve, and then screw the air vent into it.
The shut-off valve is a small device. But it makes it possible to remove the air vent on a working system.
The shut-off valve has a spring-loaded gasket inside, which, when released, shuts off the coolant. When installing the air vent, the valve is pushed down, opening access to the system. It is very desirable to install this simple device in centralized heating systems. It allows you to remove the air vents without stopping and draining the system. And you will have to take them off for cleaning. In general systems, the coolant has a lot of impurities that settle and clog the spool and its supporting mechanism. If a lot of dirt is collected, the coolant begins to flow through the outlet. This means it's time to take it apart and clean it. This is where the shut-off valve comes in. With it, you simply unscrew the air exhaust device, the spring is released and seals the hole with a gasket.
When installing an automatic air vent, there are several rules:
- Use a regular wrench. The adjustable wrench cannot be used: it is difficult to control the applied force.
- Hold on to the hex under the cylinder. You can't hold on to the body: you can break it.
Another type of automatic vent valve
A little about prices. It has a significant variation and depends on the manufacturer, the diameter of the connection (half-inch ones are about 10-15% more expensive), as well as on the material used. The cheapest models cost about $ 5, the most expensive ones cost $ 15. But in different stores, prices for the same models can vary greatly.For example, you can buy an automatic Danfoss DN 15 air vent for both $ 7.63 and $ 11.5. But, of course, you need to look carefully so as not to buy a fake. This is especially dangerous with well-known companies: Danfoss (Danfoss), Wind (Wind) or Valtec (Valtek).
We also give the prices for shut-off valves. There is also a spread, but not so significant: from $ 1.1 to $ 1.8.
Manual way to remove air in batteries
And yet, manual models are more often put on radiators. And the most common of them is the Mayevsky crane. It is a small, simple and efficient device. It is also called a needle air vent valve.
It is a metal washer with a thread applied around the circumference. The washer has a through tapered hole with a thread. The hole diameter is very small. On the one hand, 1-1.5 mm (towards the radiator) and about 5 mm on the other.
Diagram of the "Mayevsky" crane
A locking cylinder is screwed into the hole, on which the thread is also applied. When closed, it shuts off the coolant flow completely. Unscrewing the cylinder, the cone is raised, the hole opens. If gases have accumulated in the radiator, they come out. If there are no gases, the coolant comes out. But there cannot be a lot of it: a lot will not flow into a hole with a diameter of 1 mm.
In some models, a plastic disc with a drain hole is attached to the body (diameter is also about 1 mm). This disc rotates freely around the horizontal axis, which allows the drain hole to be set to a comfortable position.
an air cock is ... What is an air cock?
air cock
turn / shake / tap
Russian-Ukrainian Metallurgical Dictionary - K.: Naukova Dumka. comp. V. D. Chekhranov, V. I. Meleshko .. 1970.
- air duct
- air
See what an "air tap" is in other dictionaries:
- air valve - - [A.S. Goldberg. The English Russian Energy Dictionary. 2006] Energy topics in general EN air cock ... Technical translator's guide
- Driver's crane - Westinghouse air brakes ... Wikipedia
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- Stop crane - trains of the Singapore city transit system are not operated on the train, but from the platform. Penalty for inclusion without a valid excuse S $ 5,000. Stop valve (emergency brake valve) component of the brake system ... Wikipedia
- The first ANT made of winged metal - ... There was a civil war. Not enough food, fuel, transport was working poorly. Snow drifts in the winter of 1918/19 threatened to cut off communications with remote regions of the country and paralyze the railways. And in this harsh time in ... ... Encyclopedia of technology
- Heating * - artificial heating of the space inside buildings. Mostly O. is applied to buildings intended for people to stay, but it is also arranged in buildings for other purposes, such as: in greenhouses, in rooms for animals ... ... Brockhaus and I.A. Efron
- Beet and cane sugar * - I. Chemistry. II. Technical production. III. Statistics. IV. Sugar excise. V. Sugar normalization. VI Sugar in international trade. I. C. (chem. C 12 H 22 O 11). Finding and obtaining beet and reed S. see below. S.…… Encyclopedic Dictionary of F.A. Brockhaus and I.A. Efron
- Heating as artificial space heating - inside buildings. Mostly O.is applied to buildings intended for people, but it is also arranged in buildings of other purposes, such as: in greenhouses, in premises for animals (non-climatized or of high value) and in ... ... Brockhaus and I.A. Efron
- Beet and cane sugar - I I. Chemistry. II. Technical production. III. Statistics. IV. Sugar excise. V. Sugar normalization. VI Sugar in international trade. I. C. (chem. C12H22O11). Finding and obtaining beet and reed S. see below. S. crystallizes ... Encyclopedic Dictionary of F.А. Brockhaus and I.A. Efron
metallurgical_ru_uk.academic.ru
How to use the Mayevsky crane
If you have collected air in the heating radiator, you need to take a special key (a small piece of plastic that comes with each kit) or a regular screwdriver. Insert it into the slot on the air vent disc and turn it one / two turns counterclockwise. At the same time, a hiss will be heard - this is through a small hole next to the disc that air begins to escape. Gradually, along with the air, water begins to come out (the trickle is very thin, do not be alarmed). When the trickle becomes solid, close the tap by turning the key (screwdriver) in the opposite direction.
This procedure is usually needed when starting the system, and from time to time throughout the year. After the end of the heating season, it is also necessary to check for the presence of gases - it is forbidden to drain the coolant, since the inner surface of the radiator very quickly corrodes "on dry". And since the coolant remains in the radiator, the reactions continue to occur. What can be done so as not to forget to bleed the air is to turn the tap a little after disconnecting the batteries. Then there will be a small hole through which water (coolant) will not flow without pressure, and the gases will gradually be released.
Another option for a manual air vent
This valve is produced by the same companies as the automatic ones. There is also a cone here, but the design of the device is somewhat different. In addition, there is a handle. It is, of course, more convenient to use than a key. The principle of operation is similar: turn in one direction, the cone moves away from the hole, the air comes out. Turned in the opposite direction, closed the hole.
This is another manual air vent. Here tode there is a locking cone, but a slightly different shape
A little about prices. The price of a Mayevsky crane is $ 1.2-1.5, manual valves of another type - from $ 2. It is difficult to say how much the most expensive can cost, but there are semi-antique models that offer to buy for $ 20.
Air vents for air bleeding STD 7073V in Moscow
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3/4
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(according to TU 36-710-82). In the process of replenishment with a heat carrier, a certain amount of air dissolved in the water mass (sometimes more than 30 g / t) enters the heating system, which can be released in places with a low water velocity and low pressure in the form of bubbles, which, accumulating, can
Moscow, MKAD (internal) 33, vl. 6
Air vent 3/4 ″ (10/100) UNI-FITT 237P3000
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Air vent 3/4 ″ (10/100) UNI-FITT 237P3000 (Crane
Mayevsky manual turnkey Uni-Fitt 3/4 ″) - a device for bleeding air from central heating water-type heaters, opened with a specialized key or screwdriver. The second name of the air vent is
crane for venting
STD 7073V (according to TU 36-710-82). In the process of replenishment with a heat carrier, a certain amount of air dissolved in the water mass (sometimes more than 30 g / t) enters the heating system, which is capable of in places with a low water velocity and low
How to install hand models
The Mayevsky crane is screwed into the adapter. Usually, there are no problems with the selection of diameters, since this device is included in a mounting kit for radiators.Only when assembling, you need to remember that if you put on the radiator on the left, you must first screw the air vent into the adapter, tighten the thread (with a regular wrench, without applying excessive force). After that, the assembly can be screwed into the manifold. The whole installation.
Another version of the handheld device is easy to install. The process is the same as for the automatic installation. In this case, it is also desirable to install in tandem with a shut-off valve (the "Mayevsky" valve cannot be removed without stopping the system). If you mount it with a valve, screw the valve into the adapter from the mounting kit. Then install this assembly on the radiator. And then you can screw the air vent into the installed valve.
Sometimes, to ensure tightness, a winding is wound on the thread. Only you don't need to wind it a lot, and you can't use paint. Better to take some sealant (only sealant can be used).
How the Mayevsky crane is installed is demonstrated in the video.
an air cock is ... What is an air cock?
air cock
air valve - [A.S. Goldberg. The English-Russian Energy Dictionary. 2006 g.]
Topics
- energy in general
Technical translator's guide. - Intent. 2009-2013.
- air box with tiered regulation
- air dome
See what an "air tap" is in other dictionaries:
- Driver's crane - Westinghouse air brakes ... Wikipedia
- Westinghouse Air Brake - This term has other meanings, see Air Brake. Westinghouse air brake ... Wikipedia
- Aircraft Carrier - If you are looking for fantastic, not real, aircraft, see Aircraft Carriers in Science Fiction "Flying Aircraft Carrier" TB 3 4AM 34FRN with fighters And 16 under wing Aircraft Carrier, Flying Aircraft Carrier, Aircraft carrying an aircraft ... ... Wikipedia
- Mayevsky crane - tech. = manual air valve ... Universal additional practical explanatory dictionary of I. Mostitsky
- Stop crane - trains of the Singapore city transit system are not operated on the train, but from the platform. Penalty for inclusion without a valid excuse S $ 5,000. Stop valve (emergency brake valve) component of the brake system ... Wikipedia
- The first ANT made of winged metal - ... There was a civil war. Not enough food, fuel, transport was working poorly. Snow drifts in the winter of 1918/19 threatened to cut off communications with remote regions of the country and paralyze the railways. And in this harsh time in ... ... Encyclopedia of technology
- Heating * - artificial heating of the space inside buildings. Mostly O. is applied to buildings intended for people to stay, but it is also arranged in buildings for other purposes, such as: in greenhouses, in rooms for animals ... ... Brockhaus and I.A. Efron
- Beet and cane sugar * - I. Chemistry. II. Technical production. III. Statistics. IV. Sugar excise. V. Sugar normalization. VI Sugar in international trade. I. C. (chem. C 12 H 22 O 11). Finding and obtaining beet and reed S. see below. S.…… Encyclopedic Dictionary of F.A. Brockhaus and I.A. Efron
- Heating as artificial space heating - inside buildings. Mostly O. is applied to buildings intended for people to stay, but it is also arranged in buildings for other purposes, such as: in greenhouses, in rooms for animals (non-climatized or of high value) and in ... ... Brockhaus and I.A. Efron
- Beet and cane sugar - I I. Chemistry. II. Technical production. III. Statistics. IV. Sugar excise. V. Sugar normalization. VI Sugar in international trade. I. C. (chem. C12H22O11). Finding and obtaining beet and reed S. see below. S. crystallizes ... Encyclopedic Dictionary of F.А. Brockhaus and I.A. Efron
technical_translator_dictionary.academic.ru
