German VAG valve VAG model VAG price

VAG valves are devices used for venting in HVAC and heating, ventilation, and air conditioning systems during operation. During operation, gases released from water upon heating, such as hydrogen and oxygen, can cause numerous adverse effects that damage the system and reduce thermal efficiency. If these gases are not vented promptly, many negative consequences may occur, such as: corrosion caused by oxidation; formation of air pockets in radiators; poor and unbalanced hot water circulation, causing partial lack of heat in certain radiators; noise when pipes operate with entrained air; cavitation in circulation pumps. Therefore, waste gas in the system must be discharged promptly, highlighting the important role of automatic air vent valves.

VAG valve operating principle

When the system is filled with water, gases in the water continuously escape due to changes in temperature and pressure, accumulating at the highest point. When the gas pressure exceeds the system pressure, the float descends, driving the valve stem downward to open the valve port, allowing continuous gas discharge. When the gas pressure falls below the system pressure, the float rises, driving the valve stem upward to close the valve port. The automatic air vent operates in this continuous cycle.

VAG valve applications

Valves installed on controllers within the system architecture to release air pockets generated in heating systems and water supply pipelines; widely used in manifold distributors, radiators, underfloor heating, air conditioning, and water supply systems.

VAG valve installation

1) Automatic air vent valves must be installed vertically to ensure that the internal float remains in a vertical position, so as not to affect venting; 2) When installing automatic air vent valves, it is recommended to install them together with isolation valves, so that when the air vent valve needs to be removed for maintenance, the system remains sealed and water does not leak out; 3) Automatic air vent valves are generally installed at pipeline locations prone to air accumulation, such as the highest point of the system or the highest point of a pipe section, to facilitate smooth venting.

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