• Description
• Characteristics
• Product reviews
• Other Meibes products
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• Delivery
• Warranty

The DHW boiler safety group is designed to protect the hot water supply system from exceeding the maximum allowable operating pressure.
The set pressure is fixed by the manufacturer and is indicated on the valve cap. The valve is protected against resetting the response pressure. Also included are check valve, shut-off valve, control screw, funnel with drain fitting.

• vendor code	ME 6915B.80PE
  Brand	meibes
  Diameter (mm)	15
  Material	Brass
  Maximum operating pressure(bar)	10
  Set pressure (bar)	8
  Maximum working temperature(°C)	110
  Connection diameter (in)	1/2
  Producing country	Germany
  Warranty period (months)	12

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  • Bank transaction.
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  • Cash payment.
  Payment is made at the office, at Staronasypnaya 30/2.

Check the cost of delivery with the managers of the online store.
The cost of delivery depends on the carrying capacity of the vehicle, the address and dimensions of the goods you purchased.


Free shipping within the city of Sochi and the Adler district for orders with an amount of more than 50,000 rubles, metal from 3 tons.


Pickup made on the 5th day after 100% payment for the order at the following addresses:

• Sochi, Adler district, st. Aviation street, 34;
• Sochi, st. Krasnodonskaya 36a.
  Delivery in Sochi and Adler: from 10:00 to 18:00 on the 5th day after 100% payment for the order.
  Delivery to other regions of Russia production given to transport companies and andcalculated on an individual basis know information by phone 8 800 100-44-33.
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• general information

  We strongly recommend that you contact the service centers if you have any problems related to the operation and performance of products and products.

  In order to avoid misunderstandings, we kindly ask you to carefully study the User Manual, the terms of the warranty, check that the warranty card is filled out correctly. The warranty card is valid only in the presence of correctly and clearly indicated: model, serial number of the product, date of sale, clear stamps of the seller, signature of the buyer. The model and serial number of the product must correspond to those indicated in the warranty card.

  Warranty Limitations

  In case of violation of these conditions, as well as in the case when the data specified in the warranty card is changed, erased or rewritten, the warranty card is invalidated.

  In this case, we recommend that you contact the seller to obtain a new warranty card that meets the above conditions. In the event that the date of sale cannot be determined, in accordance with consumer protection legislation, the warranty period is calculated from the date of manufacture of the product.

Security group designed to provide and control the required pressure in the heating or hot water supply system and reset it when it goes beyond the maximum limit.

The safety group consists of: a safety valve that discharges part of the water (coolant) when it is in excess, an air vent, and a pressure gauge. All these elements can be installed in the system both separately and assembled in one housing.

Safety valve (valve overpressure) - is a valve in which the closing stem is pressed by a spring. The spring stiffness is selected at the factory by setting the valve to a certain pressure (1.5, 3, 6 bar, etc.). Safety valves must be installed in all systems where expansion of water (heat carrier) due to heating is possible. In the house, such systems are - heating and a hot water supply system (boiler of indirect heating or water heater). If the pressure in the system rises higher than the rating of the safety valve - the valve spring will no longer be able to hold water, it will compress and open the valve - the pressure will be released, but simply the "excess" coolant will be discharged into the side outlet of the valve.

In order not to get burned when the valve is suddenly opened or not to spoil the repair in the room, a drain pipe is screwed to the side outlet and sent to the sewer or drainage tank.

Do not think that when triggered, the overpressure valve releases a lot of water - in ordinary private houses, in order for the pressure to drop from 3 to 1 bar, it is necessary to release about one glass of water, and sometimes less.

In order for the safety group to bleed air from the system, it must be installed in the upper part of the pipes suitable for the boiler or boiler, that is, the air vent protects the boiler or boiler from airing. Protection of radiators or other high points of the system is provided by other air vents or Mayevsky cranes.

Shut-off valves must not be installed between the boiler and the safety group!

When choosing a boiler safety group, it is necessary to clarify what power it is designed for. For powerful boilers - safety valves with a large flow area (3/4 or 1 inch thread) are used in the safety group.

Maximum pressure of heating and water supply systems

Safety valves are selected based on the nominal working pressure in the system. Consider the nominal pressures of the main engineering systems and the necessary safety valves for them.

1 bar \u003d 1.0197 kgf / cm2 \u003d 0.98692 atm.

• Heating systems with wall gas boilers. Nominal - 1.5-2.0 bar, safety valve- 3.0 bar.
• Heating systems with floor gas boilers. Nominal - 1.0-1.5 bar, safety valve - 3.0 bar
• Heating systems with solid fuel boilers, stoves with built-in boilers. Nominal - 0.5-1.0 bar, safety valve - 1.5 bar.
• Hot water supply systems. Nominal 2.0-4.0 bar, safety valve - 6.0 bar.

In the piping of boiler plants, various elements are used, each of which performs the function assigned to it. Some provide circulation of the coolant, others distribute or block it, others are responsible for filtering or compensating for the expanding volume of liquid. There are also devices that prevent the occurrence of accidents in emergency situations. In this article, we will highlight the question of what role the boiler safety group plays in the heating system, what it consists of and how it is installed correctly.

Device and purpose of the security group

In essence, this simple element consists of three different devices mounted on a common manifold. The latter is made of brass or stainless steel and has 3 seats in the form of threaded holes.

From below the collector is equipped with a threaded coupling for connection to the heating system. Attached to the top:

• manometer;
• automatic air vent;
• relief valve.

Accordingly, the heating safety group combines 3 functions, we will analyze each of them in more detail. The manometer is used for visual control of the water pressure in the boiler tank and the system as a whole. It also plays an important role in filling the pipeline network and setting the pressure when the heating system is closed type.

The main function of the air bleeder is service. Inside it there is a chamber with a float mechanically connected to a valve that opens when there is no water. The task of the device is to remove air when the boiler and system are filled with coolant, as well as during operation. There are also additional function- the release of the first portions of steam formed in the boiler tank during overheating.

A safety valve is an emergency device that releases water, steam or a mixture of them in case of exceeding the set pressure threshold. It turns out that the principle of operation of the boiler safety group is to control and prevent emergencies associated with the boiling of the coolant in the water jacket of the heat generator. After all, what is happening? First, the pressure gauge registers the increase in pressure, then the emerging steam leaves through the air bleeder, and the last stage is the discharge of water or a steam-water mixture from the system by a safety valve.

If there were no safety group in the heating system, then overheating would inevitably be followed by an explosion of the unit shell with all the ensuing consequences. So, if no action is taken, relief valve will drain the water until the pressure is within the acceptable range. In the vast majority of boiler installations, the upper pressure threshold is 3 Bar, although there are instances with a maximum operating pressure of 1.6-2 Bar.

Scope of application

It turns out that a security group for heating is not always needed, but at the request of the homeowner it can be installed in any system and serve as a safety net. For example, heat generators burning natural gas and diesel fuel, as well as those working on electricity, do not need additional protection. These boilers themselves have high level safety and can instantly stop and stop heating when the temperature or pressure rises.

Note. In closed heating systems with a gas or electric boiler, a safety group is most often placed for ease of control and maintenance.

But solid fuel heat sources have great inertia and cannot stop immediately. Even automated pellet boilers take a little time to burn the fuel that has entered the combustion zone. Imagine a firebox full of burning wood? A thermostat or controller will immediately shut off the air when the temperature rises in the jacket, but the process will not stop immediately. The firewood will not go out, but will smolder and as a result the water temperature will rise by a few more degrees. Only a safety group for a solid fuel boiler can prevent boiling and explosion, which is why it is an indispensable attribute heat generators of this type.

Note. Most manufacturers initially complete their solid fuel units with a safety group.

Installation instructions

If a wood-burning or coal-fired boiler is not equipped with a safety group, then it can be bought separately or assembled independently without any problems. The main thing here is to choose the right devices for your heat generator. Specifications an automatic air vent does not play a big role, but the pressure gauge and emergency valve are selected according to the maximum operating pressure indicated in the operating instructions for the boiler.

In general, installing a security group in a heating system is not difficult; anyone can do this with a standard set of locksmith tools. Installation can be done in two ways:

• setting on the "native" fitting coming out of the boiler;
• tie-in in the supply pipeline at the outlet of the heat generator.

Important. When installing the element, one main rule should be remembered: in the area between the outlet pipe of the unit and the safety group, it is forbidden to install any fittings and it is not allowed to connect other devices using a tee. The length of this section should be as short as possible, ideally the devices are placed near the boiler itself. The photo below shows the entire set of listed violations:

When the group is placed on the supply line, you should choose a place so that the pressure gauge readings are clearly visible from the entrance to the boiler room. Sometimes for this it is necessary to mount the safety group on a vertical pipe section or a special bracket attached to the wall. Connect a hose (preferably transparent) to the outlet of the safety valve and lower it into plastic canister or sewer. The first option is good because you will always notice by the presence of water in the tank when the boiler was working in critical mode in your absence.

Conclusion

Even though only the security groups need to be set up solid fuel boilers, it is possible, and even recommended to be installed in all closed-type heating systems. This will not lead to large costs, but it will create comfortable conditions service and provide an extra layer of protection.

Safety group for heating with expansion tank is a set of aggregates that perform a protective function. They not only prevent emergency, but also protect the heating system from breakdowns. You can buy such a block in a specialized store or make it yourself. The latter option is more complex, but less expensive.

If you want to save on such a unit, then you can make it yourself

Block device

The safety block for the heating system includes 3 separate devices, which are located in a special manifold. The group consists of the following devices:

1. Pressure gauge. This simple and frequently used device helps to control the coolant pressure and maintain it at a safe level.
2. Air vent. It is used to remove air from the coolant in the heating system. The device operates in automatic mode.
3. Safety valve . It is used to monitor the pressure in the system. If the set parameter is exceeded, the valve will open and part of the coolant will be removed from the system.

All these components are installed in specially designated places of the collector. The entire safety group is connected to the equipment using a threaded coupling.

In this video you will learn how to tie the boiler

Operating principle

All work on installing a security group in closed system heating must be carried out by highly qualified specialists. Only they will be able to connect the devices correctly and set them up properly. If everything is done correctly, then The security group will work like this:

1. There is an emergency in the heating system. In this case, the movement of the coolant stops and the pressure begins to rise rapidly.
2. Part of the steam passes into the automatic air vent. A special float is built into it, which catches even the smallest air bubbles.
3. Once this has happened, the float drops and opens the valve.
4. The steam is released to the outside and quickly reduces the pressure in the installation.
5. If the air vent could not cope with the pressure on its own and its indicator continues to grow, then the safety valve is triggered.
6. It opens and drains the coolant until the pressure returns to normal.

If any emergency occurs, the security team will protect you and your heating

Structural elements

The scheme of the heating safety group provides for the use of all structural elements. Otherwise, the unit will not function properly, which can lead to various breakdowns and accidents.

Accurate pressure gauge

This device is designed to measure pressure (in atmospheres or bar) and provide instant results. To do this, a scale is graduated on the pressure gauge and there are two arrows. One of them shows the pressure in the heating system, and the second - the limit value, which is set during the setting.

The device can measure any pressure, which is in the range from 4 to 10 bar. These indicators are quite enough, since the standard value may vary within the following limits:

1. For pipelines of heating systems installed in apartment buildings, - 1.5 bar.
2. In suburban one-story buildings - from 2 to 3 bar.

Mayevsky crane

An automatic air vent must be installed in the heating security system of a private house and a city apartment. It is best to do this at the highest possible height. This feature is due to the fact that air is lighter than the coolant. It moves up and accumulates there, hindering correct work equipment.

Air may appear due to the following factors:

1. Rubber seals of poor quality or premature wear.
2. The first start-up of the installation and filling the pipes with coolant.
3. Corrosion formation inside the lines of the device.
4. Incorrect installation or non-observance of tightness conditions.
5. Drinking water.

Such a faucet protects your heating system from the ingress of various dirt.

Mayevsky's crane is designed in such a way that the smallest particles of dirt cannot get into the air chamber. The air vent is assembled from the following parts:

• case with cover;
• jet;
• float;
• spool;
• holder;
• body and valve sealing rings;
• Cork;
• spring.

Safety valve

During work heating system an increase in the volume of the coolant is compensated by an expansion tank, which is mounted on top of the heating devices and pipes. The user independently sets the desired outlet temperature, which leads to a change in the liquid level in the expansion tank.

In most cases, the performance of this node remains effective for a long time. As wear increases, the likelihood of any breakdown increases. It is absolutely impossible to determine the problem visually, since its root is hidden inside the pipeline. Such a malfunction will lead to a rapid increase in pressure and the destruction of the nodes of the heating system. To combat this phenomenon, a safety valve is used. It is installed together with other parts of the safety group and protects the device from damage. In addition, the owner of the dwelling will see the discharge of liquid, which will confirm the presence of a problem.

Before starting operation, it is necessary to check the safety valve for operability. You can do this in the following way:

1. The handle, which is located at the top, turns in the indicated direction and opens the water.
2. Then the same actions are done in the opposite direction.
3. If the liquid still flows out, then it is necessary to open and close the safety valve several times in a row.
4. If the performed manipulations did not give desired result the valve is broken and must be replaced with a new one.

Stages of self-assembly

You can assemble the safety group for the heating system yourself. This will require a lot of time and Money. If everything is done correctly, the unit will work perfectly and protect equipment from breakdowns, as well as emergency situations.

Connection rules

Before proceeding to self-assembly security block, you need to study in detail the advice of professionals. They help newbies avoid a large number mistakes and make it real reliable design.

Do not forget to strictly follow the instructions when connecting a security group

General Tips by connection:

1. It is best to install the protective block on the supply pipeline located at the outlet of the device.
2. You can place the unit at a distance of at least 50 centimeters from the heat source.
3. On the section of the pipeline where it is mounted protective device, there must be no foreign parts (tees with a branch, taps).
4. Professionals do not recommend installing a safety group on metal-plastic or polypropylene pipes, as they can be deformed under the influence of heated air. The best option will use a metal piece.
5. The automatic air vent is fixed only in a vertical position.
6. The safety valve can be connected flexible hose through which excess liquid can flow into the bottle or onto the floor.

Selection and purchase of components

Ready-made security blocks are quite expensive, so it is best to purchase its individual components. Such little trick help cut costs in half.

When choosing details the following tips should be followed:

1. Do not buy the cheapest safety valves that were made in China. Such products will quickly fail and will not relieve pressure.
2. All pressure gauges of Asian origin give incorrect readings. This is due poor quality materials and incorrect graduation.
3. It is better not to use an angle type air vent, as it creates additional resistance to the escaping steam.
4. The safety valve should be selected based on the operating pressure of the installed boiler. Such information can be found in the technical data sheet, which is attached to the device.
5. The crosspiece is better to choose from high-quality brass.

During the work, you will need some materials and tools. They can be bought at any hardware store or rent from friends.

Items must include:

• adjustable wrench;
• gas keys;
• Union;
• cross;
• adapters;
• squares with external and internal threads;
• any material for sealing joints (sanitary flax, special tapes and others);
• sealant.

Operating procedure

As soon as everything preparatory stages have been completed, you can begin to assemble the safety block. This work is done in a few simple steps:

1. Plumbing linen is carefully wound onto the thread of the squares. It is important to lay the material evenly, without gaps.
2. For better fixation of the connection is applied thin layer sealant.
3. The squares are attached to the cross with a wrench.
4. Then a pressure gauge, a Mayevsky crane and a safety valve are mounted. If they have different diameter then use suitable adapters.
5. All joints are carefully treated with sealant.
6. The protective block is tested for operability. During the inspection, detected leaks and other defects are eliminated.

Safety

When installing the unit and operating it, it is important to observe simple precautions. They will not only help maintain health, but also reduce the risk of injuries of varying severity.

Among the main rules are the following:

1. You need to install the security system in such a place that you can easily approach it and eliminate small breakdowns.
2. The components of the safety unit must not interfere with the operation of the heating system. Otherwise, there is a high probability of breakdowns.
3. Structural parts can become very hot during operation. Because of this, you need to be extremely careful not to touch hot elements. If you neglect this rule, you can get a pretty severe burn.
4. In the event of an emergency, turn off the device immediately. This will protect it from further damage and help reduce the risk of injury.
5. Any repair work can only be carried out with the equipment turned off and cooled down.

Installing a security unit for a heating system is a rather complicated undertaking that requires significant time and financial costs. With the right approach to business and compliance with all the recommendations of professionals, you can simplify the work and complete it as soon as possible.