Attic floor insulation device. Subtleties of attic floor insulation

The heating system is inherent negative property accumulate air in the pipelines, which prevents hot water from circulating fully. This leads to the fact that radiators reduce heat transfer to the premises of an apartment or house. Dozens of years ago, a special faucet was invented, with the help of which you can ventilate the heating system without unnecessary hassle. Installing a Mayevsky tap allows you to increase the efficiency of heating appliances. This device is structurally simple and easy to install.

Operating principle of the Mayevsky crane

The Mayevsky tap is essentially a shut-off valve, which has several modifications. Depending on the installation location of the air vent, a plumbing part of a certain design is selected. The most popular material for faucets is brass, which does not corrode. For this reason (and thanks to the design features) Mayevsky cranes are reliable and durable.

In a heating system with vertical branching, such installations are mounted on all devices located on the upper floor. In a situation with horizontal system taps are installed on all radiators. The Mayevsky faucet is also installed on the heated towel rail, but before installation it is necessary to install a tee in the right place. The device is installed in a vertical area with the hole directed away from the wall.

After installing the taps, you need to ventilate the entire system. This procedure occurs in a certain sequence.

• It is imperative to prepare a container into which water will be poured through the hole after the air has left the system.
• Then from heating system Air is removed, which is lighter than water and therefore accumulates in the upper parts of the devices. Using a wrench, a screwdriver or your hand (depending on the design of the tap), the Mayevsky tap is turned counterclockwise one turn. After this, a hissing sound will be heard - this means that air begins to escape from the battery. To speed up the process, you can turn the device a little more. After some time, when the air leaves the network, water will flow through the hole. This means that the system in a particular place is de-aerated and the valve can be closed.
• If pumps are installed in the house and the system operates from them, then the units must be turned off before releasing air. The air must have time to rise to the top of the radiator before it is removed from the heating system.

Installation of Mayevsky crane

To put Mayevsky's crane on his permanent place stay, no special experience or knowledge is required from the person. The main thing is that the tap matches the size of the inlet. These plumbing fixtures can be ½" or ¾" threaded. The tap is connected to the radiator in its top part, while the hot water inlet should be in the opposite direction.

• Before carrying out work related to the installation of taps, the water from the heating system must be drained first into a suitable container and then into the toilet.
• In radiators that are manufactured in Lately, holes are made in the plugs specifically for taps, which greatly facilitates installation. If the radiator has a plug of a different design, it can be dismantled and a more suitable shaped part can be installed.
• The tap must be installed on the battery in such a way that the hole is turned away from the wall, while it should be slightly inclined downwards. This arrangement will make it possible, when releasing air, to place a suitable container under the hole and drain some of the water.

The Mayevsky crane can be installed manually or automatically. It all depends on the choice of the owner, which can be influenced design feature heating system.

If the batteries are cast iron and old, then before installing the tap you will need to do preparatory work. The following information must be taken into account:

• when installing an air vent on such a radiator, you need to make a hole in the plug on top, cut a thread in it, and then screw in the tap;
• if old radiators are part central system heating, it is not advisable to install automatic taps. In such networks, hot water is not clean, so there will be constant problems with automatic air vents - the taps will have to be cleaned regularly. In addition, when the heating is periodically turned off, air pockets will often appear in the system;
• In central heating systems, hydraulic shocks periodically occur, the force of which can reach 15 atmospheres. In this regard, automatic cranes need to be installed with a special design. The video shown clearly shows how the Mayevsky crane is installed.

Faucet care

Mayevsky cranes are characterized by reliability, therefore, within for long years no special claims are made against them. Biggest problem The problem is that the holes in the part sometimes become clogged. This happens when the hot water is not clean. In this case, basic cleaning is required. Contaminants can also get inside the case or into the plastic lining. In this case, you can use a regular hairpin or needle for cleaning. If the tap has become unusable, it must be replaced, not forgetting to drain the water from the heating system. This work can be done using an adjustable wrench, and during dismantling you need to fix the radiator plug in a static position and make sure that it does not loosen when unscrewing the plumbing fixture.

Installing a tap on a convector, radiator or heated towel rail is a quick procedure at low cost and it is not surprising that this part completely pays for itself. This increases the efficiency of the heating system.

Video

The video will tell you what a Mayevsky crane is and how to install it.

Modern heating systems for buildings and structures for industrial, public and residential use have one common technological element - the Mayevsky tap: the operating principle of this device is to remove unwanted gaseous substances from the operating circuit in order to ensure maximum efficiency of the heating system. The purpose and technical characteristics of this device will be discussed in this article.

A huge number of closed hydraulic systems used in high-tech industries (automotive, heating, mechanical engineering, etc.) use technology for removing gaseous substances (air) from the working circuit, which reduce the efficiency of their operation. This is especially true for heating systems.

The Mayevsky valve functions in the same way as a conventional shut-off type valve - this is the opening/closing of a sealed connection from an area of ​​a gaseous or hydraulic medium with high pressure to an area of ​​​​a medium with normal physical conditions. Historical prototype modern designs The Mayevsky valve was the most ordinary saddle-type water tap.

However, an uncontrolled fence process water from heating systems using conventional water taps required a special design that makes it difficult or completely eliminates water loss from heating networks. An advanced solution to this problem was the Mayevsky crane, which has undergone many improvements in connection with the development of engineering thought.

Mayevsky crane: photo

Whatever the technical design of the Mayevsky valve, the operating principle of this device always corresponds to its direct technological purpose and the regulations of the industry standard - this is a valve for bleeding air STD 7073V (according to TU 36-710-82) from heat supply systems for industrial and domestic use.

Structurally, it is designed like an air stop valve needle type (hence the second name) in the form of a combined radiator plug with a built-in mechanism for bleeding air. Since the STD 7073B standard regulates design dimensions, the air valve for radiators (aka Mayevsky) has an outer mounting diameter of half an inch (1/2″), three-quarters of an inch (3/4″), one inch (1″), etc. d. The valve sizes with a nominal diameter (DN) of 15, 20 and 25 mm allow it to be used not only in radiators, but also in various components of the heating system. TO technical specifications include parameters such as operating pressure(Ру) – 10 atm (1 MPa) and operating temperature – up to 120 degrees Celsius.

Design of the Mayevsky valve

The main element of the valve design is a locking screw, which is screwed into the mechanism body and has a conical end part, which ensures a tight fit into the “seat” of a through hole with a diameter of 1.5-2 mm. The outer part of the screw is a tetrahedral or hexagonal head (for a special key for the Mayevsky tap) with a slot for a regular screwdriver. To allow air to pass when the valve opens, the screw body is made with longitudinal grooves.

The air exiting the grooves enters a chamber hermetically sealed with a cuff (usually made of polymer) and having an outlet hole with a diameter comparable to the through hole. Since the valve body is installed using threaded connection, having a stuffing box gasket, and the valve mechanism in the closed position tightly closes through hole, then during operation of the heating system installed faucet ensures complete tightness of the system.

Helpful advice! When choosing a valve, it is necessary to take into account the corrosion resistance of the material from which its parts are made. Since many manufacturers produce products made of chrome-plated steel with a short service life, preference should be given to products made of brass or stainless steel.

Mayevsky tap on heated towel rails

If there is a radiator in the premises connected to the heating system or hot water supply system, it is necessary to use a heated towel rail with a Mayevsky tap. Features of the installation of such replaceable elements without the presence of these valves can lead to the accumulation of air in the upper zones of the internal space of the heated towel rail and the most problematic thing is to create “air plugs” that stop the circulation process both in the heating circuit and in the hot water supply circuit. The presence of a Mayevsky tap on the heated towel rail allows you to eliminate this negative.

Mayevsky crane: operating principle of an automatic air vent

Automatic air vents for radiators are increasingly used in heating systems. This special design Mayevsky crane, which ensures the discharge of gas accumulations in automatic mode. Let us next consider how an automatic air vent works. Its design assumes the presence of a float in a vertical channel. Without a gaseous medium, the float supports a spring with an internal plug through a lever, making the system airtight.

Under conditions of a gaseous environment, the float falls, weakening the spring pressure on the plug, the latter opens the outlet hole, and the gas mixture comes out. When the volume is replaced by the gas component, the coolant fills the float chamber and the float floats up, closing the outlet hole through a spring with a plug. If the float mechanism breaks down, you can manually bleed off the accumulated gas mixture using a Mayevsky key.

The need to use a Mayevsky tap in heating systems

After installing the heating system and filling the circuit with coolant (water, antifreeze, technical oils), there is always air left in the radiators. It forms so-called air pockets and stops circulation working fluid. This leads to a loss of efficiency of the heating system, since the boiler operates at set temperature, and the radiators are “cold”. In this situation, you cannot do without using a Mayevsky crane.

After graduation heating season degassing occurs in the coolant environment. A certain amount of dissolved air in the coolant, when the temperature drops and is at rest, is released from the liquid and accumulates, forming the same “air plugs”. Therefore, before starting the heating, it is necessary to add coolant to the system and, if possible, use the Mayevsky tap.

Another negative factor in the formation of gas accumulations in the heating system is the process of hydrogen formation during hydrolysis reactions of water and the internal walls of metal pipelines and radiators. This is especially true for radiators made of aluminum without protective anti-corrosion treatment. With the use of a Mayevsky crane in the system, this problem is completely solved.

Model range and manufacturers of Mayevsky cranes: prices

Currently, the plumbing products market includes: a large number of models of Mayevsky cranes, both domestic and imported, using various materials and components. When buying one type or another, you can and should also buy a metal key for the Mayevsky crane. Keys are also available in plastic versions.

The table provides information on the types and prices of Mayevsky cranes:

Helpful advice! If there is a need to buy a Mayevsky faucet, be sure to coordinate the mounting dimensions of the valve installation locations in the heating system elements with the parameters of those purchased. In case of discrepancy, additional purchase of adapters and consumables will be required.

Features of using and adjusting the Mayevsky crane

Let's consider the option when the system is installed and assembled, but Mayevsky taps are not mounted on the radiators. Then you can do it yourself. To do this, you need to unscrew the plugs on the opposite side of the working fluid inlet into the radiator and screw in the selected valves in their place.

Helpful advice! Regardless of the presence of a pressure seal on the threaded part of the valve body, it would be advisable to use it on the thread sealing tape FUM or tow for better sealing.

How the Mayevsky crane works

The outlet of Mayevsky's radiator taps must be adjusted so that it is directed in the opposite direction from the wall and preferably with a downward slope.

As for the installation of the Mayevsky tap on heated towel rails, it must be placed in a strictly vertical position using a special tee. Using the latter allows you to convert the working axis of the mounted crane from vertical to horizontal. This preferred technological location makes it possible to fulfill the requirement of the instructions: the bleed hole should be directed in the opposite direction from the wall and have a slope towards the floor.

An important issue is the use of the Mayevsky tap for cast iron radiators. Their plugs do not have mounting holes for standard valves. However, many craftsmen have found a way to install valves for bleeding air through the operation of drilling and threading in the body of a cast iron plug. But as practice shows, such “handicrafts” can lead to thread failure during water hammer phenomena, when the coolant pressure can increase tens of times. The way out of this situation is to install plugs for cast iron radiators of automatic air vents adapted to the mounting dimensions. Moreover, they are not afraid of clogging.

It should be added to the above that in the case when the coolant may contain solid particles of debris (scale, welding flux, tow threads, paint, etc.), then it is advisable to install a standard mechanical filter for water supply in front of the tap.

Mayevsky valve: how to use

Let's look at how to use the Mayevsky tap, or more simply: how to bleed the air? The Mayevsky valve provides a fairly simple process for bleeding air from the heating system. Special attention should be given the moment when the heating system is installed fuel pump to increase the coolant circulation rate. Be sure to turn it off before bleeding the air. Firstly, in order to reduce the pressure inside the circuit and, secondly, to stop the process of mixing air bubbles throughout the entire volume of the coolant.

If you follow a small set of rules, you can independently carry out work to remove accumulated air in the system:

• use a small container and a dry rag, which must be installed under the outlet of the Mayevsky tap;
• prepare a key to turn the valve adjusting screw;
• To be on the safe side, have a sliding or open-end wrench with you for possible additional tightening of the tap into the radiator.

Mayevsky tap in a hot water supply system using a column or

By placing a key (or inserting a screwdriver) onto the head of the adjusting screw, it is necessary to smoothly perform the opening operation (unscrewing the screw) until the sound of hissing of escaping air appears. Hold the screw in this position until liquid starts to drip out of the radiator. It is advisable that it be poured into a prepared container. Then slowly screw in the screw until the liquid stops flowing out completely. To do this, wipe the valve body with a dry cloth and visually observe the valve outlet. If no liquid leakage is observed, the tap is hermetically closed.

In cases where, after opening the valve, water flows out from under the threaded connection of the body, the thread should be gently tightened using wrench until the formation of droplets completely stops. Videos and instructions found on the Internet will also help you learn how to bleed air from a heating radiator.

Mayevsky crane in pneumatic systems

A technical feature of the Mayevsky crane is its design uniqueness. It can also be used to remove not only air, but also liquid, namely from pneumatic systems with high pressure air. Typically, the compressed air entering the system from the compressor contains an excess amount of water vapor. Technologically, excess moisture is removed special devices by freezing and various filters.

Behind long time During operation, a significant amount of water can accumulate in stationary (pipe) lines. It accumulates in the lowest zones of the pneumatic lines and is sprayed throughout the entire circuit. Water getting into working compressed air pneumatic devices and equipment are highly undesirable. In these cases, the Mayevsky crane comes to the rescue. Only in this case is it mounted at the lowest point of the circuit and the bleeding process begins with the release of accumulated liquid (water) and ends with the exit clean air. Then the tap closes and the system again becomes hermetically closed.

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Often a heating system malfunction occurs as a result of accumulated air. The created plugs prevent the coolant from moving along the circuit. This reduces the efficiency of the entire heating system. To eliminate such problems, the Mayevsky crane was created, the operating principle of which is to bleed off air masses. Mounted this device at the top point of the batteries and is controlled both automatically and manually.

Such a device is represented by many types, which differ in methods of application and design.

Air locks occur in the following situations:

• during installation new system heating;
• when draining water from mains and carrying out repair work;
• when installing radiators;
• if corrosion processes are present;
• if the circuit is leaking.

Mayevsky's automatic faucet is made from brass material, which is characterized by resistance to rust. The device consists of a housing with a cone-type needle valve. The valve is controlled by a shut-off screw, which is installed externally. When closed, such a valve does not allow coolant to pass through. Turning the screw helps release the accumulated air.

All devices have different cross-sections external thread, which allows you to choose an option according to size. To set up such devices, use a screwdriver or an adjustable wrench. Such products are most often made from brass, since such a material is characterized by resistance to aggressive environments.

The air vent can have different configurations, but the principle of operation of the Mayevsky valve is similar in many models. The taps are selected according to their diameter and are attached to the battery casings. In a horizontal installation, such devices are attached to each battery.

Helpful advice! Installation of Mayevsky taps on radiators will be required if the structure contains areas located below the device connection.

Varieties of Mayevsky crane: photos of different models

There are several types of air vents:

• The Mayevsky manual type faucet is a simple device. If uneven heating is detected, the device is opened slightly with a special key. Then after leaving air jams, the tap is turned back on;

• There is no manual control method for the automatic device. Such products are made of brass and have a cylindrical shape. In this case, the product does not have a needle valve, instead of which a plastic float is used. When air pockets form, the mechanism begins to move and affects the opening of the device;

• The principle of operation of the Mayevsky crane with a built-in safety mechanism differs from conventional air release. Safety valve regulates pressure pressure. If the indicator exceeds the permissible parameters, the valve is activated and releases the coolant forcibly. This avoids the occurrence of water hammer in the structure. This option is perfect for metal-plastic or polypropylene pipelines.

What should you pay attention to when choosing a device?

Before installing the Mayevsky tap, pay attention to certain parameters of the radiators.For centralized heating schemes, it would be advisable to use manual devices that allow air to be released as needed. It is better to install automatic taps if available autonomous system heating.

IN centralized systems The coolant is highly contaminated, which will affect the constant clogging of passage holes in automatic structures. It is better to install automation in hard to reach places, but it is important to monitor the cleanliness of the coolant. If the mechanism is mounted on a battery that is located in a recess in the wall, then adjustment will become difficult due to the inaccessibility of the adjustment screw. In this case, you can use a special key, which is placed in the same plane as the battery.

Many heating systems are still created using cast iron batteries. In this case, you can use a manual model of the Mayevsky tap for cast iron radiators or automatic devices made of brass.

How to properly install a Mayevsky crane?

It is not so easy to install a Mayevsky crane if you do not have special knowledge. It is important that the gasket for installing such a device is silicone or rubber. When installing such a device, make sure that the tap is the same size as the inlet.

The device is mounted to the radiator in the upper areas, with the hole under hot water placed on the opposite side. Installation includes the following steps:

• before work you need to empty the system of water;
• V the latest batteries Slots for taps are provided. If there are plugs, the faucet should be installed instead so that the hole is turned away from the wall and has a downward slope.

When attaching the air vent to a used battery, a slot is made in the plug part and a thread is cut into it. Then the main device is connected using a key for the Mayevsky crane.

Installing an automatic air vent: operating principle

Automatic products have a sealed brass body. There is a float installed inside the mechanism, which is connected to drain valve. Such a device will only work if the locking cap is open. Before use, the cap is unscrewed several turns.

The operating principle of an automatic air vent for heating depends on the specific type of product. There are three types of devices:

• straight models are mounted vertically;
• corner ones are installed at a certain angle;
• special devices for radiators.

When using low-quality coolant, the air outlet hole may become clogged, causing the valve to not fit tightly.