Code: EVCP Categories: ,

EVCP Heating Expansion Vessel

From £37.00 £44.40 inc. vat


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).

Product Specification
  • Backflow Prevention No
  • Powered No
Specification Clause

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 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.

Data Sheets


evcpdatasheet-1.pdf (575.55 KB)


Installation Guide

evcp_evupo_mmanual_26.pdf (149.98 KB)