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The Caleffi 573002A automatic filling valve is a device consisting of a pressure reducing valve with compensating seat visual system pressure setting indicator an inlet filter anti-scale internal parts a shut-off valve round knob on bottom and a check valve. It is installed on the water inlet piping in sealed heating systems and its main function is to maintain the pressure of the system at a set value automatically filling up with water as required. After installation during the filling or topping-off phase the water feed will stop when the set pressure is reached. This valve fills 50% faster than other valves. There are no levers to flip or valve to close. Perfect to built and maintain pressure in a water or glycol radiant floor heating system Function The Caleffi 573002A automatic filling valve is a device consisting of a pressure reducing valve with compensating seat visual system pressure setting indicator an inlet fi lter anti-scale internal parts a shut-off valve round knob on bottom and a check valve. It is installed on the water inlet piping in sealed heating systems and its main function is to maintain the pressure of the system at a set value automatically fi lling up with water as required. The valve is pre-adjustable meaning it can be set to the desired pressure value before the system charging phase. After installation during the fi lling or topping-off phase the water feed will stop when the set pressure is reached. This valve fi lls 50% faster than other valves. There are no levers to fl ip or valve to close.