German Nedschroef valves Nedschroef models Nedschroef prices

Nedschroef valves are devices used to vent air in HVAC systems during operation. During the operation of HVAC systems, gases released by heating water, such as hydrogen and oxygen, can cause numerous adverse effects that damage the system and reduce thermal efficiency. If these gases are not vented in time, they can lead to many negative consequences, such as: corrosion caused by oxidation; formation of air pockets in radiators; poor and unbalanced hot water circulation, causing partial lack of heat in some radiators; noise from pipes running with air; and cavitation in circulation pumps. Therefore, waste gas in the system must be vented promptly, highlighting the important role of automatic air vent valves.

Nedschroef valve working 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 drops below the system pressure, the float rises, moving the valve stem upward to close the valve port. The automatic air vent operates in this continuous cycle.

Nedschroef valve applications

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

Nedschroef 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 air venting; 2) When installing automatic air vent valves, it is best to install them together with isolation valves. This ensures system tightness and prevents water leakage when the air vent valve needs to be removed for maintenance; 3) Automatic air vent valves are generally installed at pipe sections where air tends to accumulate, such as the highest point of the system or the highest point of a pipe section, to facilitate smooth air venting.

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