Air vents are used to remove gases from pipes and containers, especially air, from systems that carry liquids. Air vents are classified as fittings. Common and well-known areas of application are the venting of pipes, such as brake lines in vehicles, the venting of heating systems, such as radiators, pipe registers, heat generators, buffer storage tanks and underfloor heating distributors, or the venting of pipe systems with water-cooled pumps to prevent damage to these.
Common types of air vents are:
- The air vent valve, which is operated manually,
- The expansion body deaerator based on the swelling body principle.
- The automatic air vent valve with float.
A very simple method of venting is to use a venting valve, which is operated until all the air has escaped. The venting process must be initiated manually (by hand) or electrically (e.g. via a solenoid valve).
The most commonly used method of venting is based on the swelling body principle, which is used in heating systems. The principle is based on the swelling capacity of a swelling body, which allows air and gas to escape, but swells on contact with water, thereby closing a valve seat or outlet and thus sealing it.
Vent valves with a float are equipped with a float body that seals a vent outlet when the float body is pushed upwards by a liquid or opens the outlet when gas or air collects at the float. This allows it to escape and the float closes the outlet again automatically as soon as this process is completed.
For customized solutions in the field of solenoid valve applications, we can provide solutions based on all three principles and also implement combinations of manual and automatic venting valves. In practice, such solutions are used in water-cooled pumps, for example, to prevent overheating. The following illustration shows a combination of a manual air vent operated by a solenoid valve and an automatic air vent with float. In this case, air vents based on both principles were integrated into a single body, which now enables automatic and manual venting.
