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For closed heating (according to EN12828) and cooling systems.When the temperature in the system rises, the system water expands. The "expansion water" is temporarily stored in the expansion vessel to keep the pressure in the system at the right level. Each vessel is tested at the factory.
The thread of the system connection is uncoated, which ensures a problem-free connection. The fixed bag diaphragm prevents the water from coming into contact with the bare steel of the vessel. Nitrogen gas filling to maintain pre-pressure for longer.
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