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april 2011

Air vent valves even for boilers

Automatic air vent valves for removing the gases that accumulate in systems and which can block them

The boilers require the assembly of air vent valves in order to achieve maximum efficiency during their operation, since an abnormal accumulation of gas (released in the system and due to the heating of the fluid) could block the whole system. In fact, air is mainly a double problem: on the one hand there is the risk of corrosion of the elements of the plant and, therefore, the progressive loss of efficiency; on the other there is the problem of cavitation which can cause the deterioration of the system and its malfunction. For these reasons, the air vent valves for boilers are required and in the catalog there are several models, all with automatic operation. The choice of automatic valves makes it possible to deal with the problems mentioned in completely autonomous way, without resorting to periodic intervention.

What are the components of the air vent valves for boilers?

Air vent valves for boilers are simple devices and consist of some fundamental elements for optimal operation:
- The float: element that moves in relation to the filling of the valve chamber with air or water. It rises when the water fills the chamber and goes down when the air bubbles gather, forming macro-bubbles.
- The rod of the rocker arm: connecting element between the float and the shutter.
- The shutter: element placed at the top and necessary to close the air vent.
- The air vent: channel in which the air flows to be eliminated outside.

When the chamber fills with water the float rises and, through the rocker arm, the shutter closes the duct for the air vent. Once the air bubbles have gathered in the valve chamber, the float descends and causes the shutter to open.
Only at this moment the air can flow on the outside and the water pressure returns to rise, causing the ascent of the float and the beginning of the next cycle.

The technical specifications of the air vent valves for boilers

As previously stated, in the Gnali Bocia catalog there are several air vent valves for automatic boilers that derive from a controlled, guaranteed and ISO-9001 certified supply chain. The materials used are several:
- Brass EN 12165 - CW 617N: used for the valve body. It is a high workability alloy with a low lead content.
- Stainless steel: it is used for springs because it is resistant to the problem of corrosion.
- "Anti-sticking" synthetic rubber: it is an ideal polymeric material for sealing gaskets.
- Brass EN 12164 - CW 614N: material used for certain details and suitable for reducing heating and wear.
- Plastic materials: used for other details and they must be resistant to heat as they come into contact with high temperatures. Some examples can be Noryl and Hostaform.

As for the technical specifications, the air vent valves for Gnali Bocia boilers are designed to withstand temperatures of 100 ° C and pressures up to 10 bar.


See also
18/06/2017 You don't need an operator, all you need are some air vent valves Using air vent valves to stop air and gas from accumulating in your system is important for optimal system performance

18/01/2018 Air vent valve controlled by a float With a float system the air vent valve eliminates the gas accumulations in the systems

18/07/2017 Radiators and air vent valves, the perfect couple Automatic air vent valves for radiators eliminate air without any manual intervention

18/06/2016 Air vent valves and internal balance Air vent valves work thanks to an internal floater regulating its balance.

18/01/2020 Let's not forget the air relief valve in our installations Air relief valve combined with the automatic check valve for easy maintenance

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