Eres expansion vessels are manufactured to meet the requirements of PED 97/23/EC Directive, are suitable for closed solar energy heating systems. The vessels are fabricated by welding the various sections together which results in a very reliable structure suitable for internal pressures up to 10 bar. The Eres diaphragm has been specially developed for solar applications. Suitable for temperatures up to 130°C, resistant to ethylene or propylene glycol mixtures and has low gas permeability. Max. working pressure: 10 bar Operating temperature range: -10 to 100°C Transient peak temperature: 130°C Factory air pre-charge pressure: 1.5 bar
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