15 mm Filling Valve CA Serv Valves PRV Comp.

Backflow Prevention Device primarily intended for filling and pressurising sealed house heating systems, or non-house systems, which have been risk assessed by the water supplier and downgraded to a Fluid Category 3 risk. A Type CA device – with suitable pressure regulation – can be permanently connected to a small heating system without the need for a removable filling loop. This enables the system to be filled and pressurised. A non-house primary circuit or heating system is classed as a Fluid Category 4 risk by default and a BA device can be used for filling and pressurising – see “Autofill”. The CA device affords permanent Fluid Category 3 protection. The relief port affords better protection than a double check valve (Type ED) and a CA device may be permanently connected – no removable filling loop required. A discharge pipe should be connected to the integral tundish. Under normal operation the unit should not discharge. The valve will discharge a tiny quantity of water if the supply pressure falls below about 0.5 bar or 110% of downstream pressure. A continuous discharge could occur if debris becomes lodged in the relief valve or the second check valve during a backpressure condition.