Design

The two halves of the vessel and the diaphragm are retained by a crimped collar to give a pressure tight seal on sizes 8 to 25 litre and on larger sizes by a welded joint. Non-replaceable diaphragm. Epoxy coated in grey. Suitable for flow temperatures up to 120 ̊C, resistant to ethylene orpropylene glycol mixtures and has low gas permeability. Altecnic expansion vessels are all tested according to the Pressure Systems Directive.