It incorporates pressure reducing valve, pressure relief valves, check valve, and filter in a single valve design. I'm struggling to think of anything that would cause the 'trapped' domestic side to increase like this. Specification Part Number 533112CST, F0001223 gtin 8016615624090 Maximum working Temp 65°C Max Inlet Pressure On Application 12. Pressure reducing valves are devices which, when installed on a private plumbing system, reduce and stabilise the inlet pressure from the water mains. Since there are three 22mm pipes to hook up and the 15mm outflow you would probably otherwise need a 'union' to be able to make the connection to the tundish.

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.The item may be missing the original packaging or protective wrapping, or may be in the original packaging but not sealed. Read more about the condition New other (see details): An item in excellent, new condition with no wear. Comprised of a pressure reducing valve, a pressure relief valve a check valve and filter all included in a single Monobloc valve.

This includes a specific connection for a balanced cold water take offs and a dedicated connection for an expansion vessel. My understanding is the pressure reducing valve ( 3 bar) is to maintain a level and balanced pressure for cold flow and thus level flow and equal pressure on hot water.Do you have a anti-'water-hammer' vessel fitted in a place where it could get really hot during the day, enough to cause the pressure to climb?