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Specification Part Number 533112CST, F0001223 gtin 8016615624090 Maximum working Temp 65°C Max Inlet Pressure On Application 12.I'm struggling to think of anything that would cause the 'trapped' domestic side to increase like this.

Caleffi is a decent make, I understand, but these fellows - well, the safety-release-valves - are prone to allowing a drip through after they've been activated.it is a pressure reducing valve (3 bar) on the main inlet feed with a 6 bar safety release valve, it is the safety release valve that is dripping into the tundish, it was doing this approx. Another possibility that I forgot to mention is that the expansion vessel could be undersized - if the EV cannot cope with the amount of hot water expansion in the system it will then have to go somewhere else (the PRV). This amount includes seller specified domestic postage charges as well as applicable international postage, dispatch, and other fees. The item may be missing the original packaging or protective wrapping, or may be in the original packaging but not sealed. Pressure reducing valves (PRV) are installed in domestic water systems to reduce and stabilise the inlet pressure from the mains supply, which is generally too high and variable for domestic appliances to function properly.

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