A ventilation system is provided in every private or apartment building. The most important function of ventilation is to constantly circulate and supply fresh air, while at the same time removing dust deposits and odors.
Sometimes it happens that instead of a stream of air, a stench from neighbors arrives.
Here you understand that a reverse-acting valve for ventilation devices is a must. In this article, we will consider all the details of the check valve topic.
Axis with blades - the key content of this part. The curtain, under a certain influence of air, passes it only in a certain direction.
In the event of a cessation of air flow, the blades are closed. The valve itself regulates both the flow of air masses and the volume of clean air.
When development ventilation system in a private house , whether it is basement ventilation or attic ventilation , we recommend that you analyze a number of reasons , according to which the check valve should be installed in your room.
This usually happens in the event of a breakdown or clogging.
The key question.
It's simple :
The plug should go out if the air flow is correct.
It should also be noted that at the design stage and installation it is better to provide for the installation of a check valve. Since its price is insignificant, as well as during the operation of ventilation, clogging, deformation and environmental influences are possible, which in turn will lead to a change in the air flow in the ventilation itself.
That's when you have to buy a valve, take the time and cut it into a working system.
Plastic (plastic ).
These are some of the cheapest and most commercial devices. They are often used in office buildings, houses, cottages.They look very attractive, and thanks to the rich color palette of the material, any design can be brought to life.
Galvanized steel . They are widely used in industry and administrative buildings.
These models are very durable, this allows them to cope with their task for a long time and with high quality. Valves made of steel do not have such a disadvantage as fire safety, since steel does not burn, unlike plastic.
The combination of materials . The body of the device is made of zinc-plated steel, and the shutter or blades are made of plastic. It is widely used in rooms with natural ventilation.
This valve reacts even to small wind movements, providing a high-quality and natural air exchange.
It all depends, of course, on the shape of the duct. It should be noted that for round valves intended for household use, they are produced with a diameter of 100 - 200 mm.
- these are the most common sizes. And for industrial systems it is possible to issue 150 - 1000 mm.
And for everyday life there are mainly round valves, and for industry, rectangular ones.
And now let's analyze the most important classification.
Single-leaf gravity-acting valve. Air, moving from the room, acts on the leaf, fixed on the axis of the valve body.
Under the influence of this force, the sash opens. In the event of a reverse thrust, the sash will close automatically by gravity.
The presence of one sash makes the design simple and reliable.
When installing this type of valve, a level should be used, since it should only be mounted in a vertical or horizontal position.
This design has two versions :
And usually it is located in the middle.
Butterfly or bivalve valve using springs
Similar in structure to a petal valve, only it has two petals located on one axis. Hence the similarity with an insect, from which it got its name.
Usually used in forced ventilation systems.
That is, when the ventilation is turned on, the blades open, and when turned off, they close with the installed springs. Such a device can even be positioned at an angle. Check the sensitivity of the curtains before purchasing. Recently, the sensitivity adjustment is done according to the compression force of the springs.
Valve with gravity grid
In appearance they resemble blinds, which can be positioned both vertically and horizontally.
When you turn on the ventilation, the blinds open and air begins to flow, as soon as you turn it off, the blinds close.
Most often they are located within the walls to protect communications. The main advantage of these types of valves is their use at subzero temperatures in outdoor conditions.
Flexible diaphragm valves
The principle of operation is also similar to that of a petal valve. A thin flexible plate is used only as a curtain, which, when closed, fits snugly around the perimeter.
They are installed mainly in rooms with natural ventilation, since the membrane is very sensitive. The disadvantage is that the diaphragm will deform with excessive reverse thrust.
It should be borne in mind that the cost of standard check valves is low, and there is no point in making the valve yourself.
And if the ventilation boxes are non-standard, then you should think about how to make a check valve for ventilation with your own hands.
The simplest mechanism that you can make yourself is a lobe or diaphragm valve.
Instead of a curtain, choose a rigid plate of metal or plastic. To prevent the passage of air flow, the curtain should fit as tightly as possible to the edges of the case. And also the curtain should be firmly fixed in order to exclude sounds and friction.
A sheet of polyester film or thick paper is recommended to be used as a material for the membrane. The most important thing is that the sheet is larger than the ventilation hole.
A grill should be installed on the ventilation hole so that the membrane does not deform. That's all the design is ready for use.
First, you need to decide on the number of valves that we will install.
So, if you have the only place for air intake, and it enters the mine further, then you can prevent reverse draft by using one valve in this system.
If Since ventilation is complex and involves several hoods for ventilation, a rule should be applied that regulates the number and location of non-return valves.
The check valve should be installed in easily accessible places so that it can be quickly and conveniently serviced and cleaned.
Recently, manufacturers of fans and hoods already include check valves in their designs. As a result, the installation of additional valves is impractical.
is simple, we buy a valve taking into account the shape and size of the hole, apply it and mark the places for drilling. We drill, apply and fix, having previously coated the edges of the valve with sealants.
It should be noted that it is best to buy valves with metal elements for streets. If suddenly ice forms on them, they can be easily cleaned mechanically, and the plastic is likely to break.
If you are installing a surface-mounted non-return valve in front of the indoor fan, the process is similar to the description above.
And if you need to install a check valve inside the ventilation shaft, then you will need to dismantle ventilation device.
Now you don't have to worry about the penetration of unwanted odors into your premises.
Finally, I would like to say that at the moment there is a huge selection of models, shapes and sizes of check valves for ventilation on the market.
But it is worth remembering that you should buy from bona fide manufacturers and then you will receive a device with appropriate properties and quality assurance.
It should also be remembered that if an unscrupulous approach to the selection of a check valve can lead to poor air exchange.
And in order to prevent this from happening, a number of rules should be followed when choosing this device:
This combination will provide maximum air exchange efficiency.
As you can see, the ventilation check valve plays an important role in ensuring comfortable climate in any room.
When using complex ventilation systems, it is important to correctly place check valves to block the return air flow.
The combination of hoods and fans will then function flawlessly. Indeed, the service life and the quality of ventilation as a whole depend on the correct installation of these devices.
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