What is a wet rotor on a pump? What is a pump rotor

When it is necessary to heat large rooms with a total area of ​​​​several hundred square meters, the pressure in the autonomous heating system with natural circulation (about 0.6 mPa) created by the heating heater is usually insufficient.

To solve this problem, you can go in two ways:
1. Build a closed system using large-caliber pipes, which are not cheap.
2. Turn on the circulation pump into the system.

The second option is economically more feasible. By improving the circulation of coolant in the system, heating efficiency increases significantly.

Circulating heating pumps are divided into two types:
1. With a wet rotor.
They are used in the heating system of private households, where the length of pipelines is not so long.
The pump rotor, equipped with an impeller, rotates inside the housing and accelerates the movement of the coolant. The liquid inside which the rotor rotates cools and lubricates the mechanism.
When installing a “wet type” pump, you should pay attention to the horizontalness of the shaft, then there will always be water inside the housing.
Advantages of glandless rotor pumps:
- almost silent;
- stepless switching of rotor speed;
- reliability in operation;
- long service life;
- no need for maintenance;
- ease of repair and adjustment of the pump;
- relative cheapness.
Flaws:
- low efficiency (not higher than 50%)

2. With a dry rotor. They are used in long-distance heating systems. O-rings are installed between the electric motor and the working part of the rotor, the service life of which is 3 years. There is no contact between the rotor and the coolant.
Advantages:
- high efficiency - about 80%;
Flaws:
- high noise level, which is why they are installed in a separate room equipped with sound insulation;
- the need to control the absence of suspended particles in the coolant and dust in the air surrounding the engine in order to avoid damage to the surfaces of the sealing rings, which can cause their damage and leakage.

When choosing the type and model of a circulation pump for a heating system, you should also take into account their performance, operating conditions, features of the coolant (its viscosity and density), recommendations and requirements of the manufacturer for installation and quality characteristics of the pumped liquid.

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The potential of an autonomous heating system for several floors is not always enough. The pressure in it does not exceed the line of 0.6 MPa. To increase pressure and improve the water circulation process, you need to either create a closed line consisting of pipes of a rather large cross-section, or add a pumping unit to the equipment. Since pipes are expensive these days, it is better and more profitable.

The circulation pump is an excellent heating assistant

Experts have been trying to cope with this problem for a long time, for example, using a pump with an electric motor. But the engines with open contacts available at the dawn of the last century were vulnerable when water got on them, which instantly rendered the unit inoperative.

Only in the twenties did one German mechanic manage to assemble a sealed engine. After some time they prepared it at its base. For almost 30 years, such structures worked regularly, taking part in heating homes in Western Europe and the United States.

A clear drawback of the “primitive” water circulation pump was the poor gland seal, the rapid wear of which manifested itself with minor flaws, scratches on the shaft, and the gland material “did not suffer” in strength. The equipment needed sealing, the shaft needed grinding, so repairing a circulation pump was not uncommon for that time.

Look at the pump design and everything will become clear

Later, the knee was replaced with a snail, familiar to today’s realities, and the centrifugal apparatus acquired modern features in appearance.

Types of circulation pumps for heating and their design

A bypass pipeline in heating is nothing more than a piece of pipe that is installed parallel to the shut-off and control valves. Its task is to switch heating to natural circulation at the moment of interruption of electricity supply and equipment.

Devices on this unit are installed according to the movement of circulating water:

  • filter,
  • check valve,
  • flanged circulation pump.

The devices are introduced into the riser through shut-off valves. During the transition of the system to natural circulation, if the devices fail, the valves on the bypass are closed, but the shut-off valve underneath opens.

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For the successful operation of the “wet” water pump, and to prevent air from accumulating in the system, the bypass device is installed horizontally and equipped with an automatic air vent. A circulation pump for heating your home will help you in the cold.

Circulation pumps, used for pumping water or thin, homogeneous liquid, are an important part of the heating system. By ensuring uniform movement of coolant through the pipes, they achieve uniform heat distribution, improving performance.

In addition to ensuring the movement of liquid in a circle inside the heating pipes, the pump can operate in recirculation mode. When calculating its parameters, they try to take into account friction losses and coolant resistance. The height of the top point, pipe routing, heating devices have little effect on the operation of the pump, because the liquid supplied to the pipeline in one direction pushes it in the opposite direction. Therefore, when selecting a circulation pump, you can stop at a lower power to ensure normal coolant movement.

Calculations

The circular pump device is a mechanism in the form of a rotor placed inside a metal casing. A wheel with several blades (impeller) is attached to the rotor shaft. When the pump motor is turned on, the wings rotate and move the liquid throughout the heating system.

The principle of operation is the forced transportation of water within a closed loop of the heating system, in other words, ensuring the circulation of coolant through pipes and radiators. Proper selection of such a unit ensures its correct operation without unnecessary costs.


Pump power calculation table.

Before choosing a pump, it is necessary to determine the volume of water that will pass through the heating boiler in one minute. These are the parameters that manufacturers set, balancing the liquid consumption with the boiler power. If a 20 kW heater is installed, then in one minute it will pass 20 liters of coolant.

Next, it is necessary to calculate the water flow in each ring of the heating system (knowing the power of the radiators, this process will not be difficult). The coolant flow in the pipes directly depends on their diameter. Inch pipes transport 30 liters of liquid per minute, two-inch pipes - 170 l/min. The average speed of water movement through the heating system is 1.5 m/sec. The power of the circular pump can be selected taking into account the length of the pipeline. For a ten-meter section of the heating main, a pressure of 0.6 m is sufficient. Therefore, in order to establish a water supply through a 100-meter heating system, it is necessary to select a pump capable of delivering a pressure of 6 m.

You can also calculate power using the following formula:
Qpu=Qn/1.163xDt [m3/h], where

  • Qpu (measured in m3/hour) – coolant supply at the design point;
  • Qn (measured in kW) – heat consumed in the heated area;
  • Dt – temperature difference in the forward and return pipelines (on average 10-20 °C);
  • 1.163 – specific heat capacity of water.

Such calculations are not absolute, but rather standard. There are complex formulas for more accurately determining the required power of the circulation pump, but understanding them without certain knowledge in the field of physics will not be easy. And the units are mass-produced, so it is only possible to adjust their operational parameters to individual heating systems only approximately. Therefore, experts advise selecting a pump with a power reserve of 5–10% of that obtained as a result of calculations. There are devices with several setting modes. During their operation, you can select optimal operating parameters.

Having such simple knowledge and enlisting the help of the seller, you can choose a circulation pump of the optimal power that will provide heat throughout the entire room.

Kinds

The fluid pressure is created by the rotors on which the blades are attached. Most often, the design of a heating circulation pump involves one rotor, but you can find an option with two. An important operating condition is the absence of air in the system.

According to the design and design of the working part, the pump can be with a wet rotor or a dry one. Those with a wet rotor are specially designed so that it and the impeller are in the pumped medium. Changes often affect the design of the housing, made in such a way that liquid enters through existing technological gaps, its constant movement cools the motor and lubricates moving parts.

Circulation pumps equipped with a wet rotor do not have an oil seal or a sliding mechanical seal. The rotor is completely located in the pumped medium, which provides cooling and lubrication of parts. As the rotor rotates, water constantly passes through the sleeve. The best effect is observed if the pump is positioned horizontally, then air pockets do not form inside the wet rotor.

The fact that all parts of the heating circulation pump are constantly in liquid not only lubricates the moving parts, but also absorbs vibration noise, so they are practically silent. To check its operation and the correct rotation of the rotor, use a special device or visually by opening the rear plug. The absence of noise during operation allows them to be widely used for individual heating. In addition, the design of pumps equipped with a wet rotor can be conventional - for heating systems, and special - for hot water supply, where the possibility of mineral deposits is taken into account.

In such cases, the liquid does not wash the rotor or lubricate the moving parts. The main advantage of this type is the ability to pump a larger volume of liquid. The advantage is manifested in installing engines of higher power. In addition, the device comes with a solid shaft on which a motor with impellers or with a coupling is installed - here it is possible to replace the electric motor or install another one with larger parameters.

To prevent water from entering, a mechanical seal or oil seal is installed between the pump and the electric motor. When rotating, a thin film of water appears between the surfaces. Due to the pressure created inside the pump, the film additionally seals the rotating parts. The main material in the manufacture of rings is agglomerated coal; sometimes, under difficult working conditions, the seal is made of ceramics or stainless steel.

According to the design, the circulation pump device comes with a flange motor connection and a coupling connection. If the pipes (suction, pressure) are located on the same axis, then this is a direct-flow design, which allows them to be installed directly in the line. A frame is provided for mounting. In addition to attaching the pump and electric motor to the frame, it is itself installed on the foundation.

Why is it necessary?

A heating circuit with a circulation pump eliminates some of the problems that are typical for the natural type of coolant movement. After all, if the water leaving the radiator is cold, and when it also reaches the outer radiators it is barely warm, then the cold water entering through the return forces the boiler to work at its maximum capabilities. With the slightest design miscalculations or installation errors, the imbalance in temperature becomes even more noticeable, especially when it is necessary to warm up the room quickly, or when the system is first started, which can be seen in the operation of the boiler, in distant registers.

The use of a circulation pump eliminates these disadvantages. First of all, the requirements for compliance with pipe slopes and their flow area are reduced, and all traffic jams caused by temperature differences are eliminated. Heat transfer occurs evenly, the temperature of the coolant at the inlet/outlet of each radiator is almost the same, and the difference between the coolant before entering the system and returning it to the boiler is several degrees, within ten.

The pump greatly simplifies the design of the piping system.

What does this give? Stabilizes the operation of the boiler. If the difference is several degrees, then a smaller volume of gas is spent on heating, and the duty cycle is reduced. For example, we need a coolant temperature of 70. Initially, when the water is cold, the boiler operates at maximum power, but as it warms up over time, the picture changes.

In the spring and autumn months, when the house is slightly cool at night and comfortable during the day, the combined operation of the boiler, automation, and circulation pump can maintain the coolant levels within 40°, which is impossible with natural circulation.

The coolant returns in one pass through the system, having lost only 5°, its temperature is 65°, while in the rooms it is the same, the heat is distributed evenly across all radiators, and the automation turns off the burner according to the programmed indicators.

The next switching on will occur when the temperature drops. This is an economical mode of operation, in which there is no constant heating, but only maintenance of the required temperature parameters. If thermostats are installed on all radiators, then by setting the necessary temperature parameters on each register, for example, in the kitchen, in a warm room on the south side, by lowering them, we will get additional savings.

Additional benefits

When using a heating circulation pump, it is allowed to reduce the diameter of the pipes being laid. This manifests itself in additional cost savings; it allows you to reduce the volume of water in the system; accordingly, the volume of gas to maintain the desired temperature is reduced, and the heating time is reduced.


Grundfos pump.

But there are a number of parameters that make adjustments to the calculations. The main ones are: the area of ​​the house (usually the living area is taken into account), the thermal conductivity of materials, and the friction of fluid inside the pipes. The last requirement, given the fluidity of the liquid, may seem unreasonable, but it works. The automatic control option installed on the circulation pump will allow you to heat the house before your arrival, the cottage before the weekend, and will significantly save energy. When purchasing a product, do not forget to pay attention to the warranty and service life.

There are several major manufacturers of pumping equipment that have long proven themselves to be quality and reliable. These are the brands Grundfos, DAB, WILO, Pedrollo. The main difference in their work is the maximum implementation of production automation processes, which, affecting many stages, allows us to obtain high-quality products.

Good afternoon, dear readers of the blog site

Dry rotor circulation pumps

Let’s continue the “Pumps” section by talking about circulation pumps for heating systems with a “dry” rotor. These pumps are divided into three groups: inline pumps, monoblock pumps and cantilever pumps. Unlike pumps with a dry rotor, the coolant does not come into contact with the electric motor. These pumps are less sensitive to the presence of suspended particles and scale in the water. Circulation pumps with a dry rotor are used in systems with a large volume of coolant. This type of pump is used to seal the shaft. It consists of two parts: a movable and a stationary seal. The movable part is mounted on the pump shaft, and the stationary part is pressed into the pump housing. Graphite, ceramics, carbon, stainless steel, aluminum oxide, tungsten carbide and other materials can be used as materials for the end seal. The material used for seals depends on the type of coolant and its temperature.

Circulation pumps for heating with a “wet” and inline pumps with a “dry” rotor are available in both single and double. Double pumps are used for redundancy; if one pump fails, the second one comes into operation. Also, when in the coldest time of the year more heat is needed, and the performance of one pump is not enough, a second pump can be switched on. During severe frosts and peak loads, both pumps can operate, and when the temperature rises and there is no need to operate two pumps, one of them remains in reserve. This achieves energy savings due to the fact that lower power pumps can be used. As you know, according to SNiP, the heating system is calculated for the coldest five-day period of the year that may occur in a given region. Based on these calculations, boiler and pumping equipment is selected. But usually the heating system is operated at maximum mode for about a month and a half. The rest of the time the heating system is used at 40 - 60% of its maximum capacity

Inline pumps

Heating pumps with a dry rotor Inline are pumps in which the suction and discharge pipes are on the same axis. These pumps have the same nominal bore and connection size of flanges on the suction and discharge pipes. The diameters of the pipes range from DN 32 – DN 100. Such pumps are installed directly on pipelines. When installing pumps on a pipeline, it is necessary to install temperature compensators to compensate for thermal expansion of the pipelines during operation of the heating system. Inline pumps are equipped with standard two or four pole air-cooled asynchronous motors with a speed of 2900 or 1450. These pumps use an impeller with reduced cavitation characteristics. Working wheel Heating pumps with a dry rotor located directly on the motor shaft. Due to this design, these pumps operate quietly, without creating much noise or vibration. Inline pumps are used for pumping cold and hot water without abrasive substances in heating, hot water supply and air conditioning systems, in refrigeration and other installations for industrial and domestic use. The temperature range of the pumped liquid is from -20 to +140°C. The maximum operating pressure of such pumps is 16 bar. Maximum ambient temperature 40°C.

Block pumps

These pumps are low-pressure, high-capacity centrifugal circulation pumps. Block pumps use standard two or four pole air-cooled asynchronous electric motors. They have an axial suction and radial discharge pipe. As standard, the pumps are equipped with support angles and brackets for attaching them to the base. Close-coupled pumps have a very wide range of applications and are used as: circulation pumps in heating and air conditioning systems, for supplying water in water supply systems, pressure boosters and fire extinguishing systems. For the food industry, monoblock pumps made of stainless steel, cast iron or bronze are used. a separate article will be devoted

Cantilever pumps

The peculiarity of these pumps is that the pump part and the engine have their own shafts and mounting units. During assembly, the pump and motor are installed on a common frame (bed), their shafts are centered and connected using a coupling. The nominal bore of such pumps is determined by the pressure pipe. The suction pipe always has a larger nominal diameter than the pressure pipe. Cantilever pumps are designed for pumping clean and slightly contaminated water without abrasive inclusions in heating, water supply and pressure boosting systems. Cantilever pumps are used in urban water supply, irrigation, drainage, public utilities, industry, etc. a separate article will also be devoted to

Operating point

The selection of circulation pumps with a dry rotor occurs according to the same parameters as. The operating point of the heating system should be close to the operating characteristic of the pump, based on the performance and required pressure.

Operation and Maintenance

Like circulation pumps with a “wet” rotor, Heating pumps with a dry rotor It is not recommended to operate without water. When the pump is running, the movable seal begins to rotate relative to the stationary one. A thin film of water forms between the friction surfaces, which wets the working surfaces of the seals. There is a spring on the rotating part of the mechanical seal, which, as the working surfaces of the seal wear, constantly presses the moving part against the stationary one. The average service life of a seal is from 2 to 4 years, but under severe operating conditions (frequent overheating, the presence of impurities and suspensions in the coolant), the service life is very sharply reduced. Dry running for pumps with a dry rotor is unacceptable and leads to damage to the working surfaces of the mechanical seal. The water film quickly evaporates, and overheating occurs, and then mechanical destruction of the rubbing parts of the seal.

Repairing the circulation pump in this case is a simple operation, but it must be carried out by specialists from service centers servicing this type of equipment.

Thank you and see you again.

Not everyone understands that in order to maintain a normal temperature in a room, not only a heating boiler and pipes with radiators are required, but also a whole series of rather complex instruments and devices, without which there will simply be no heat. One of these indispensable devices is, of course, circulation pump. And although it is better to entrust its selection and installation to specialists, home owners should also be aware of the topic. It must be said that the correct selection of a pump is a guarantee that you will be able to avoid various failures during the operation of the heating system. In addition, such a unit will save electrical energy, and it will also reduce noise in radiators and in the pipeline. And, of course, the circulation pump will increase the overall heat transfer of the system.
You can warm the room the old-fashioned way using a stove or fireplace; you can install an electric heater in each room, but such heating is not the topic of this site. Our topic is comfortable hydraulic (liquid) heating systems in which coolant circulates, warming the house with the help of heating devices.

If the total area of ​​the heated premises amounts to hundreds of square meters and if these same meters occupy several floors, then classical heating based on the natural circulation of the coolant will not be enough. And this is not surprising - the pressure in systems with natural circulation does not exceed 0.6 MPa. There are only two ways to increase pressure and improve water circulation in such heating systems - build a closed system with large-diameter pipes or introduce a circulation pump into it. Large-diameter pipes are expensive, so the best solution for heating areas of 100-150 m2 is a circulation pump. The quality of a heating system is understood as the ability of the system to maintain a comfortable temperature in the house at a coolant temperature as low as possible. Heat is transferred to heating devices through pipes connecting the boiler and radiators into a closed network - a heating system through which the coolant circulates.

Design and principle of operation of the circulation pump

A circulation pump is a small unit that is installed directly into the pipeline and ensures pumping of coolant through the pipeline. For heating systems of private houses, pumps with the so-called “wet rotor” are usually used. These pumps are called circulation pumps. Circulation pumps have a narrow specialization - they are designed for forced circulation of coolant (water) in closed heating systems. The circulation pump consists of a cast iron body, inside of which there is a rotor (rotating part) and an impeller mounted on the rotor. The rotor rotates - the impeller moves the water. One of the basic rules for installing a pump in a system: the rotor axis must be located horizontally. Being installed in a heating system, the pump sucks in water from one side and forces it into the pipeline on the other due to the centrifugal force that occurs when the impeller rotates; a vacuum occurs in the inlet pipe, and compression occurs in the outlet pipe. When the pump operates evenly, the coolant level in the expansion tank does not change, i.e. with its help it will not be possible to increase the pressure in the heating system - to complete this task you will need booster pump. The task of the circulation pump is to overcome the resistance that arises in certain areas of the heating systems.

Advantages and features of using circulation pumps

Features of modern circulation pumps (CP) are efficiency, durability, small dimensions and noiselessness. When installed correctly, circulation pumps are virtually silent. You can only tell if the pump is working by a slight vibration when you touch it with your hand.
How to choose the right circulation pump? It is important to select the correct pump in accordance with the hydraulic parameters of a particular heating system. It is better to entrust this to specialists. First of all, you need to know how much heat you will need to heat your house. This is a rather complex calculation, which includes many parameters and is done by specialists. Everything is important: what kind of windows are installed in the building, how the walls, floors and ceilings are insulated, whether thermostatic valves are provided in the system, etc. and so on. The result of these calculations is the determination of the required volumetric coolant supply in the system (m3/h), according to which the pump is selected. When reconstructing an existing system, it is preferable to use an adjustable pump. Such central heating units independently adapt to changes in flow rate in the system, are practically silent and very economical. You will not be able to independently make calculations for a complex and multi-level heating system! But, if you still decide to try, the calculation formula is given in SNiP 2.04.05-91*.
The second very important aspect is the pump pressure. This parameter is directly related to the heating system itself. It will be equal to the total hydraulic resistance of your existing system. In this case, the number of storeys of the building is not taken into account. Perhaps the fastest and easiest way is to select a heating pump from catalogs. This is very convenient, since you will be able to compare the various characteristics of the unit itself, as well as characteristics that will be important when installing the pump and during its direct operation. When choosing a pump for your heating system, take into account one important point. All characteristics obtained in the calculations are calculated for maximum pump operation. However, this mode will be used for a minimum amount of time over the entire service life of the unit. This means that when choosing a circulation pump for heating, it makes sense to lower the parameters a little. It would be correct to choose a pump whose power exceeds that required for a given heating system by 5-10%. By making this decision, you can save not only on the purchase of the pump itself, but also in the future save a lot of money on paying for electricity. And you don’t have to worry that a pump with slightly smaller parameters will not be able to supply heat to the house in severe frosts.
Noise in the heating system- one more problem. In fact, such a problem may well arise if the pump is selected incorrectly. There is another reason - noise in the pipes due to the presence of air in the system. Therefore, it is worth knowing how to remove it from the heating system. Very often, homeowners are concerned about whether problems will arise when starting the pump after the warm season, when the unit is not in use. Modern heating units can be safely turned off for several months; this will not harm them. Even if deposits appear during downtime, they are very easy to remove from the pump. To do this, an unregulated pump must be switched to maximum speed mode, while an adjustable unit has a release function. Another important point is the materials from which heating pumps are made. The shaft and bearings of modern units are made from ceramics. This allows you to significantly increase the service life of the pump, as well as ensure quiet operation.

Types of circulation pumps

The most common types are circulation pumps with a “dry” rotor and a “wet” rotor.
For circulation pumps with dry rotor include monoblock, console, and Inline pumps. Guaranteed tightness of this type of pump is ensured by the presence of a sliding mechanical seal. In the first type of construction, the rotor is not in contact with the pumped water; its working part is separated from the electric motor by sealing rings, most often made of carbon agglomerate, less often of stainless steel or ceramics, aluminum oxide or tungsten carbide (the material of the mechanical seal depends on the type of coolant). When the pump engine starts, the O-rings rotate relative to each other - between the polished and carefully fitted rings there is a thin layer of water film, which seals the connection due to the difference in pressure in the external atmosphere and in the heating system (in the heating system the pressure is higher). The spring pushes one o-ring to the other, during operation the rings wear out and self-adjust to each other, their service life will be at least 3 years - they are more efficient than the stuffing box, which requires constant lubrication and cooling. Dry rotor pumps make loud noise during operation, so they are installed in a separate room with good sound insulation. When using pumps with a dry rotor with sliding mechanical seals, you should carefully monitor the presence of suspended matter in the pumped water and the dust content of the air in the room where the pump itself is installed. The operation of a “dry” pump causes air turbulence that attracts dust particles - dust particles and suspended matter in the coolant can damage the surfaces of the seal rings, compromising their tightness. Regardless of the type of seal, be it stuffing box or sliding mechanical seal, they are destroyed during the operation of a “dry” pump, so they require the presence of liquid to act as a lubricant - in its absence, destruction of the mechanical seal is inevitable.

Currently, circulation pumps are most widely used for equipping household heating and water supply systems. with wet rotor.
They are adjustable and have high performance, which allows the use of smaller cross-section pipelines in heating systems and easy control of system parameters. A special feature of these pumps is the absence of gland seals, as well as the lubrication and cooling of the built-in electric motor by the fluid being moved. All models of “wet” type pumps do not require centering during installation and do not require maintenance for many years. They are silent, unlike “dry” type pumps, where rather noisy fans are used to cool external electric motors, they do not require maintenance for years, they are easier to repair and configure.
The only one disadvantage of pumps with a “wet” rotor is low efficiency. (no more than 50%), which determines only the domestic scope of their application. However, the costs of energy losses are completely uncritical, and are fully compensated by the undoubted advantages of this type of pumps, which are indispensable for equipping heating and hot water supply systems for country houses.

Design of circulation pumps with a “wet rotor”

Modern “wet” circulation pumps have a modular design:

  • pump housing;
  • electric motor with stator;
  • box with terminal blocks;
  • Working wheel;
  • a cartouche containing a rotor and a shaft with bearings.

A single cartouche block makes it easy to eliminate air accumulated in the pump housing during startup, and the modular design itself facilitates repair work - you just need to replace the faulty module with a new one.

How to install a circulation pump. Installation rules

Circulation pumps in modern closed systems (with a membrane tank) are best installed on the return pipeline and as close as possible to the expansion membrane tank. The most common mistake is incorrect installation of the pump on the pipeline, which can lead to a significant reduction in the service life of the pump or its failure. It must be installed so that the motor shaft is horizontal. The pump terminal module must be on top. The system must be flushed and solid particles removed. Before starting a manually adjusted pump, people often forget to vent it, which actually leads to “dry running”. After removing air from the pump and turning it on after a few minutes of operation, it is necessary to stop the pump and re-air it.
What is bypass? The bypass used in heating systems is a small section of pipeline installed parallel to the shut-off and control valves; its task is to switch the heating system to natural circulation in the event of a power failure or pump breakdown. For normal operation of heating devices, the diameter of the bypass pipe must be equal to the diameter of the riser into which it cuts. The order of installing devices on the bypass, in the direction of the coolant: filter, check valve (if necessary) and circulation pump. For efficient operation of the “wet” pump and to prevent air accumulation, the bypass is installed strictly horizontally. Just in case, you can install an automatic air vent among the devices installed on the bypass - in any place, it doesn’t matter, but in a vertical position. The advantages of the automatic air vent over the classic Mayevsky valve are that the release and subsequent shut-off of this device is carried out automatically.

The largest suppliers of household and industrial pumps for heating systems on the Russian market are the Italian company DAB and the Danish company Grundfos.
Purchasing a circulation pump from an unknown company leads to a high risk of pump failure and, consequently, “unfreezing” of the system, to significant material damage associated with replacing heating radiators, boilers, etc.

Specialists of the company "Thermogorod" Moscow will help you choose, buy, and install a heating system, will find an acceptable solution at a price. Ask any questions you are interested in, a telephone consultation is absolutely free, or use the form "Feedback"
You will be satisfied by cooperating with us!

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