air valves are designed for active use in ventilation and air conditioning systems, air heating systems, as well as in other systems, sanitary purposes, in which the working pressure does not exceed 1000 Pa.They exist in various forms, depending on what their specific purpose.
Purpose
Check valves for ventilation (in the traditional sense) are designed to prevent the overflow of fresh outdoor air through the ducts in those cases when the fan stops.Such devices may have special stops that can be adjusted, which is used to supply air to the dispensing system ventilation.It turns out that the check valves for ventilation devices are employed control air flow by changing the flow area of the duct.
Features
use check valves for ventilation were important and absolutely indispensable element of modern systems.They can be shut off or adjusted.In these devices, there is an urgent need for the cold season, since they protect the room from excessive penetration of cold air into the room, and the snow that may accidentally get into the air ducts.Reverse ventilation valve prevents excessive air typical cold pores, as well as the formation of condensation on the surfaces of certain cells.Experts strongly recommend to perform the installation of valves in smoke emergency ventilation, particularly after a fan exhaust and supply systems.If the room has plants operating on gas, too, need to install these valves.That is, any modern system of ventilation in the living room or in the production compulsorily require the installation of such devices.
Species
Check valves for ventilation are of different types and configurations.Some of them are designed for installation in vertical and some horizontal sections of the duct.If check valves are installed in the vertical ventilation ducts, it presented only one demand: the direction of air should be from the bottom up.Such devices can be installed in advance speed air streams on the vertical sections of up to 4 meters per second, horizontal - up to 5.6 meters.A reliable and correct operation of the check valve is only possible if velocity air ventilation system does not exceed the allowable level at 12 meters per second.The device is built into the system so that in use it will be absolutely imperceptible.Reverse butterfly valve for ventilation is secured to the duct by means of flanges, which are recognized in this case the most effective.
Without the use of such devices ineffective ventilation in the summer and in the winter it becomes a source of drafts.
