CHECK VALVE FOR VENTILATION: APPOINTMENT, DEVICE, TYPES, INSTALLATION

  CHECK VALVE FOR VENTILATION: APPOINTMENT, DEVICE, TYPES, INSTALLATION

Causes of external overpressure in the apartment ventilation system.

When the channels of the ventilation shafts do not go directly to the roof of the building, but to the technical floor, then under certain weather conditions air may flow from the technical floor to the ventilation vents of the apartments located on the upper floors of the building.

  CHECK VALVE FOR VENTILATION: APPOINTMENT, DEVICE, TYPES, INSTALLATION

Usually, on such technical floors equip one huge pipe, designed for the entire staircase. Under the pipe set a large pallet connected to the sewer. If at the same time to close all the other openings connecting the technical floor with the external environment, it is possible that the ventilation system will become fully operational.

But, as a result of all sorts of redevelopments associated with the construction of those. floor sheds or even living rooms, the ventilation system is disrupted. This is facilitated by broken out original or, on the contrary, additionally installed doors.

In addition, in high-rise buildings on those. There is another parallel ventilation system on the floor; it is a smoke removal system. If the doors leading to the office space of the smoke removal system are not tight, this can also cause a malfunction of the apartment ventilation.

Well, and the last. For the correct operation of the passive ventilation system, it is required that the air in the apartments be warmer than on those. floor, but in hot summer this condition may not be met.

The reason for the penetration of odors in the apartment is excessive air pressure in the technical floor rooms. This pressure arises when strong gusts of wind are capable of blowing air through openings on the technical floor, such as process windows, openings with missing doors, etc. The magnitude of this pressure also depends on the wind rose, therefore the appearance of unpleasant odors can be seasonal.

I discovered this phenomenon immediately after I moved into a new apartment on the top floor of a sixteen-story building. By the way, at that time, the original scheme of our house ventilation was not yet broken, but it still failed in strong winds of a certain direction.

It was 26 years ago, and then, I did not even try to look for a ready-made solution to eliminate this outrage. But, and in subsequent years, during my few trips to local building stores, I never saw anything like what I managed to make in just one day.

Air diaphragm valve.

The device is a diaphragm valve (valve) with the function of forced opening.

  CHECK VALVE FOR VENTILATION: APPOINTMENT, DEVICE, TYPES, INSTALLATION

1. When the air spontaneously moves from the apartment to the ventilation shaft, the valve flaps open under the pressure of the air.

2. When the air from the ventilation shaft starts moving into the apartment, the flaps shut and the valve is sealed.

3. In order to ensure the ventilation of the room with excessive pressure in the ventilation shaft, an exhaust fan is used.

Content:

  • What is a check valve for?
  • Types of check valves for ventilation
  • How to choose a check valve
  • Recommendations for installing the device
  • How to make a check valve with your own hands

The room ventilation system is designed to ensure the flow of fresh air, while removing the waste, unpleasant smell and dust. It often happens that the ventilation installed in a multi-storey building does not cope with its tasks, and instead of clean air, odors from neighbors get into the apartment. To prevent this from happening, it is recommended to install a non-return valve for ventilation.

What is a check valve for?

  CHECK VALVE FOR VENTILATION: APPOINTMENT, DEVICE, TYPES, INSTALLATION

A check valve is a design in which the blades of the valve itself located on the axis will move in such a way that the air entering the valve will not flow into the apartment. The air masses in the check valve move only in one direction, and if it changes dramatically, the device closes, which prevents air from entering the room.

The main reasons for which the check valve should be installed are:

  • Lack of supply ventilation - it can be broken or clogged, due to which the supply air simply does not flow into the ventilation.
  • Incorrect location of the exhaust pipe, as a result of blown air into the ventilation.
  • The house is equipped with stove heating, and when the stove is working, the combustion thrust in the pipe increases, which contributes to the return air flow in the ventilation pipe.
  • In one of the apartments of a multi-storey building, a powerful exhaust hood was installed, and during its operation the flow of air flows in other apartments was disturbed.
  • The presence of several extracts in one apartment will contribute to the strengthening of traction in one of them, which will lead to a violation of the outflow of air.

To check the presence of traction in the ventilation, you can use a candle. Bring a lighted candle in the ventilation and open the window. If the air flow is correct, then the candle will die out.

Types of check valves for ventilation

Valves for ventilation can be classified by production material, most often they are made from:

  • Plastic.
  • Fine galvanized steel.
  • Combined materials - steel and plastics.

  CHECK VALVE FOR VENTILATION: APPOINTMENT, DEVICE, TYPES, INSTALLATION   CHECK VALVE FOR VENTILATION: APPOINTMENT, DEVICE, TYPES, INSTALLATION

A variant made of plastic is often installed in apartments, offices, cottages. Such check valves have an attractive appearance and fit any interior style. In addition, plastic valves easily cope with the tasks of natural ventilation. Another undoubted advantage of them is accessibility - plastic check valves are the cheapest devices among other analogues.

Models made of galvanized steel are used in industrial enterprises or in administrative buildings for domestic use. Such valves have a robust design that allows them to function in the supply and exhaust ventilation systems. In addition, enterprises always have increased fire safety requirements, and steel valves do a good job of this.

In buildings where there is natural ventilation, devices made of composite materials have proven themselves well. The body of the product is made of galvanized steel, and the blades are made of plastic. Thus, the valve reacts with the smallest breeze of the wind and provides a natural breath.

Depending on the design, check valves for ventilation are:

  1. Petal. They are made in the form of a rigid valve fixed on the axis, and contain the principle of operation of the rotary mechanism. With the flow of air masses, this damper turns, thus closing or opening the air inlet.
  2. With a gravitational lattice. Externally resemble blinds, arranged vertically or horizontally. When you turn on the hood, the sash opens and begins its work. This type is installed in the walls to protect communications.
  3. Membrane. They perform work on the principle of petal valves, however, the damper in such devices is much thinner, and when the wind blows, the membrane closes the grille, thereby preventing air from entering.
  4. Butterfly. Similar in structure with a petal-type valve, however, has two petals on the axis, and this resembles a known insect. When the ventilation is turned on, the petals open and, accordingly, when turned off, they close.

  CHECK VALVE FOR VENTILATION: APPOINTMENT, DEVICE, TYPES, INSTALLATION

In addition, the valves are of the horizontal and vertical type, with and without heating, as well as rectangular or round.

  CHECK VALVE FOR VENTILATION: APPOINTMENT, DEVICE, TYPES, INSTALLATION

How to choose a check valve

Choosing a check valve for your apartment, you must be guided by the following criteria:

  • The device should be sensitive to even a slight movement of air, so it is better to install an exhaust fan with a grill. This will promote normal air circulation and increased thrust.
  • The technical parameters of the valve should correspond to the acquired fan: the power of the latter should ensure the full opening of the valve petals. Select the diameter of the valve exactly the size of the fan parameters.
  • Pay attention to the operating temperature of the valve - some devices can operate only at medium temperatures.
  • Depending on the shape of the duct, a suitable check valve is selected that has the same shape. This is done for the convenience of installing the device.

Do not forget that with the wrong selection of the valve, the air in the apartment can be broken and completely change its direction.

Recommendations for installing the device

When self-installing the valve in the ventilation is important to remember the direction of air masses. If this issue is resolved, then you can proceed to the direct installation of the device.

To do this, insert the valve body into the ventilation passage and mark the holes for future fasteners. Then, at the designated points, drill holes with a screwdriver or drill. It is also necessary to make holes for mounting in the ventilation.

Next, insert the dowels and secure the non-return valve in the ventilation with a screwdriver. It is important to pay attention to the gaps between the valve and the ventilation: if they are too wide, it is necessary to cover them with silicone to ensure tightness. If this is not done, the device will not be able to perform its intended function.

Video: Hood, check valve, natural ventilation

Video: exhaust and non-return valve, principle of operation and installation

How to make a check valve with your own hands

Having dealt with the principle of the check valve, it can easily be made independently at home. The valve of membrane action will be the simplest. It will require a finished grille, polymer film of medium thickness, adhesive sealant, fasteners.

The manufacturing process consists of the sequential execution of the algorithm of actions:

  1. Measure the dimensions of the vent and cut the grill so that its size is 2 cm larger than the outlet itself.
  2. If there is a piece of plastic under the workpiece, then to make the grid use a file.
  3. The surface of the lattice should be smooth, so that the membranes fit snugly to it.
  4. Attach two small squares of film with a thickness of 0.5 mm on both sides of the grid. Make it better with a sealant.
  5. Drill holes in the grille for fastening to the wall.
  6. Install the grille in the vent and secure.

The self-made device will be able to work both with system of natural ventilation, and with compulsory air circulation.

If there are problems with ventilation, it is still recommended to install a non-return valve, thus ensuring comfort and absence of unpleasant odors in the apartment.

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