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Expansion vessel for accomodating the thermal expansion of sealed heating systems. Model EVCP is rated at 4, 5 or 6 bar depending on size and approved for primary circuit unvented heating applications. These systems normally feature a pressuristaion unit such as the Arrow Valves Autofill. For wholesome water or heating applications where 10 bar rating is required, refer to model EVUP.
Unvented Heating Systems; Commercial (non drinking).
The primary heating system expansion shall be accommodated in an air charged Expansion Vessel – model EVCP – as distributed by Arrow Valves Ltd – Tel 01442 823123 www.arrowvalves.co.uk. The vessel body shall be mild steel with red epoxy coating with a bottom entry male connection. The butyl membrane shall be suitable for 99 degrees Celsius at 6 bar (for 80 litres and larger). A separate expansion vessel ball valve with wire lock, drain tap and union – model BVEV – shall be supplied to enable draining of the vessel in order to periodically check the air charge. The vessel must be correctly sized. The pre-charge pressure shall be 0.2 bar less than the switch on pressure of a booster pump.